Internet Engineering Task Force F. Baker Diffserv Working Group Cisco Systems INTERNET-DRAFT K. Chan Expires January 2001 Nortel Networks draft-ietf-diffserv-mib-04.txt A. Smith July 2000 Management Information Base for the Differentiated Services Architecture Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC 2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This document is a product of the IETF's Differentiated Services Working Group. Comments should be addressed to WG's mailing list at diffserv@ietf.org. The charter for Differentiated Services may be found at http://www.ietf.org/html.charters/diffserv-charter.html Copyright (C) The Internet Society (2000). All Rights Reserved. Distribution of this memo is unlimited. Abstract This memo describes a SMIv2 MIB for a device implementing the Differentiated Services Architecture [DSARCH], described in detail by the Differentiated Services Router Informal Management Model [MODEL]. Baker, Chan, Smith Expires January 2001 [Page 1] Internet Draft Differentiated Services MIB July 2000 1. The SNMP Management Framework The SNMP Management Framework presently consists of five major components: o An overall architecture, described in RFC 2571 [1]. o Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in RFC 1155 [2], RFC 1212 [3] and RFC 1215 [4]. The second version, called SMIv2, is described in RFC 2578 [5], RFC 2579 [6] and RFC 2580 [7]. o Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in RFC 1157 [8]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and RFC 2574 [12]. o Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in RFC 1157 [8]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [13]. o A set of fundamental applications described in RFC 2573 [14] and the view-based access control mechanism described in RFC 2575 [15]. A more detailed introduction to the current SNMP Management Framework can be found in RFC 2570 [16]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI. This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine-readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB. Baker, Chan, Smith Expires January 2001 [Page 2] Internet Draft Differentiated Services MIB July 2000 2. Introduction 2.1. Relationship to the Diffserv Informal Management Model This MIB is designed according to the Differentiated Services Informal Management Model documented in [MODEL]. The model describes the way that ingress and egress interfaces of an 'n'-port router are modelled. It describes the configuration and management of a Diffserv interface in terms of a Transmission Control Block (TCB) which contains, by definition, zero or more classifiers, meters, actions, algorithmic droppers, queues and schedulers. These elements are arranged according to the QoS policy being expressed, always in that order. Traffic may be classified; classified traffic may be metered; each stream of traffic identified by a combination of classifiers and meters may have some set of actions performed on it; it may have dropping algorithms applied and it may ultimately be stored into a queue before being scheduled out to its next destination, either onto a link or to another TCB. When the treatment for a given packet must have any of those elements repeated in a way that breaks the permitted sequence {classifier, meter, action, algorithmic dropper, queue, scheduler}, this must be modelled by cascading multiple TCBs. The MIB represents this cascade by following the "Next" attributes of the various elements. They indicate what the next step in Diffserv processing will be, whether it be a classifier, meter, action, algorithmic dropper, queue, scheduler or a decision to now forward a packet. The MIB models the individual elements that make up the TCBs - it only refers in passing to the higher-level concept of a TCB when it is necessary to distinguish of which TCB, of several, a particular element is a part. Literal TCBs are enumerated for Classifier elements: this is necessary to distinguish different, but overlapping, classification policies in different TCBs. However, TCBs are not enumerated for other elements. When a TCB performs no classification the literal TCB of the succeeding elements is not used in their instance (index) as there is no need to distinguish them - each element is unique already. 2.2. Relationship to other MIBs and Policy Management This MIB provides for direct reporting and manipulation of the most detailed functional elements described by the Diffserv Informal Management Model for management. These elements are instantiated in a very detailed manner, typically indexed by interface, direction and other indices. The concept of "interface" is as for the InterfaceIndex/ifIndex of the IETF Interfaces MIB [IFMIB]. Baker, Chan, Smith Expires January 2001 [Page 3] Internet Draft Differentiated Services MIB July 2000 Other MIBs and data structure definitions for policy management mechanisms other than SNMP/SMIv2 are likely to exist in the future for the purposes of abstracting the model in other ways. In particular, abstractions in the direction of less detailed definitions of Diffserv functionality are likely e.g. some form of "Per- Hop Behaviour"-based definition involving a template of detailed object values which is applied to specific instances of objects in this MIB semi-automatically. Another possible direction of abstraction is one using a concept of "roles" (often, but not always, applied to interfaces). In this case, it may be possible to re-use the object definitions in this MIB but with different indexing variables e.g. by mechanically replacing ifIndex by some sort of "roleIndex". Work is ongoing in this area. 2.3. MIB Overview In this MIB, we model the ingress and egress portions of a router identically, making the distinction between them an index variable. Each interface then performs some or all of the following high-level functions: o Classify each packet according to some set of rules o Determine whether the data stream the packet is part of is within or outside its rate o Perform a set of resulting actions, possibly including counting the traffic, application of an appropriate drop policy and marking of the traffic with a Differentiated Services Code Point (DSCP) as defined in [DSFIELD]. o Enqueue the traffic for output in the appropriate queue, whose scheduler may shape the traffic or simply forward it with some minimum rate or maximum latency. The MIB therefore contains the following elements: Classifier and Filter Tables A general extensible framework and one example (an IP Six-Tuple Multi-Field Classification Table). Meter Tables A general extensible framework and one example (an exponential weighted moving average meter). Baker, Chan, Smith Expires January 2001 [Page 4] Internet Draft Differentiated Services MIB July 2000 Action Tables Absolute Drop, Mark and Count actions. The "multiplexer", "replicator" and "null" actions described in [MODEL] are accomplished implicitly by means of the RowPointer structures of the other elements. Queue, Scheduler and Algorithmic Dropper Tables Queue, Scheduler and Algorithmic Dropper Tables. 3. Structure of this MIB 3.1. Classifiers The classifier and filter tables determine how traffic is sorted out. They identify separable classes of traffic, by reference to an appropriate filter, which may select anything from an individual micro- flow to aggregates identified by DSCP. The classification is used to send these separate streams to appropriate Meter, Action, Queue, Scheduler and Algorithmic Dropper elements. For example, to indicate a multi-stage meter, sub-classes of traffic may be sent to different meter stages: e.g. in an implementation of the Assured Forwarding (AF) PHB [AF-PHB], AF11 traffic might be sent to the first meter, AF12 traffic might be sent to the second and AF13 traffic sent to the second meter stage's out-of-profile action. 3.1.1. Classifier Table The structure of the classifier table, as described in [MODEL], is a sequence of unambiguous tests. Within each stage in the sequence, it must not be important in which order the tests are made. This is to facilitate optimized implementations such as index trees. Order is present only to resolve ambiguity: for that reason the stage in the sequence is referred to here and in [MODEL] as the "precedence" of the classifier stage: stages with higher values of precedence are compared first; the order of tests for entries of the same precedence is unimportant. An important form of classifier is "everything else": the final stage of the classifier i.e. the one with the lowest precedence, must be "complete" since the result of an incomplete classifier is not necessarily deterministic - see [MODEL] section 4.1.2. The definition of the actual filter to be used by the classifier is referenced via a RowPointer: this enables the use of any sort of filter table that one might wish to design, standard or proprietary. The filter table may be, but does not need to be, defined in this MIB module. Baker, Chan, Smith Expires January 2001 [Page 5] Internet Draft Differentiated Services MIB July 2000 The classifiers specified here are at the interface level i.e. they are indexed by ifIndex: they may be derived from some more general policies e.g. something based on interface roles, but such discussion is outside the scope of this document. See e.g. [POLTERM] section 4 for a discussion of Roles. 3.1.2. IP Six-Tuple Classifier Table This MIB includes a definition for an IP Six-Tuple Classifier, used for IP traffic classification. Entries in this filter table are referenced from the RowPointer diffServClassifierPattern attributes of classifier table entries. A Behavior Aggregate (BA) Classifier, acting only on DSCPs, is a simple form of the IP Six-Tuple Classifier. It is represented by having the diffServSixTupleClfrDscp attribute set to the desired DSCP and all other classification attributes set to match-all, their default settings. The alternative approach of providing a specific definition in this MIB for a BA Classifier was discussed and rejected. Each entry in the IP Six-Tuple Classifier Table defines a single filter. The textual convention of InetAddress [INETADDR] is used for both IPv4 and IPv6 addressing. The use of IP Six-Tuple Classifiers is discussed in [DSARCH] and abstract examples of how they might be configured are provided in [MODEL]. 3.2. Meters A meter, according to [MODEL] section 5, measures the rate at which packets making up a stream of traffic pass it, compares this rate to some set of thresholds and produces some number (two or more) of potential results. A given packet is said to "conform" to the meter if, at the time that the packet is being looked at, the stream appears to be within the meter's profile. MIB syntax makes it easiest to define this as a sequence of one or more cascaded pass/fail tests, modeled here as if-then-else constructs. It is important to understand that this way of modelling does not imply anything about the implementation being "sequential": multi-rate/multi-profile meters e.g. those designed to support [SRTCM] or [TRTCM], can still be modelled this way even if they, of necessity, share information between the stages: the stages are introduced merely as a notational convenience in order to simplify the MIB structure. 3.2.1. Meter Table The generic meter table is used as a base for all more specific forms of meter. The definition of parameters specific to the type of meter used Baker, Chan, Smith Expires January 2001 [Page 6] Internet Draft Differentiated Services MIB July 2000 is referenced via a pointer to a table containing those specifics with the instance within that table identified by the same indices as for the base meter table. This enables the use of any sort of specific meter table that one might wish to design, standard or proprietary. The specific meter table may be, but does not need to be, defined in this MIB module. 3.2.2. Token-Bucket Meter Table This is included as an example of a common type of meter. Entries in this table are referenced from the RowPointer diffServMeterSpecific attributes of meter table entries. The parameters are represented by a rate diffServTBMeterRate and a burst size diffServTBMeterBurstSize. 3.3. Actions Actions include "no action", "mark the traffic with a DSCP", "drop the traffic" or "count it". Other tasks such as "shape the traffic" or "drop based on some algorithm" are handled elsewhere as queueing mechanisms, rather than actions, consistent with [MODEL]. The "multiplexer", "replicator" and "null" actions described in [MODEL] are accomplished implicitly by means of the RowPointer structures of the other elements. This MIB uses the Action Table diffServActionTable to organize one Action's relationship with the element(s) before and after it. It allows Actions to be cascaded to enable multiple Actions be applied to a single traffic stream by using each entry's diffServActionNext attribute. The diffServActionNext attribute of the last action entry in the chain points to the next element in the TCB, if any, e.g. a Queueing element. It may also point at a next TCB. The parameters needed for each Action element will depend on the type of Action to be taken. Hence there are specific Action Tables for all the different Action types. This flexibility allows additional Actions be specified in future revisions of this MIB, or in other MIBs and also allows for the use of proprietary Actions without impact on those defined here. 3.3.1. DSCP Mark Action Table This Action is applied to traffic in order to mark it with a Diffserv Codepoint (DSCP) value, specified in the diffServDscpMarkActTable. Other marking actions might be specified elsewhere - these are outside the scope of this MIB. Baker, Chan, Smith Expires January 2001 [Page 7] Internet Draft Differentiated Services MIB July 2000 3.3.2. Count Action Table Count Actions are used to count the traffic passing along a particular path through the model. If specified, they are likely to be placed first, before other types of Action. For example, when both a Count and an Absolute Dropper Action are specified, the Count Action needs to count the traffic stream before any traffic gets dropped. Note that there are counters contained directly in Algorithmic Dropper elements to indicate the amount of traffic dropped by those elements. Counters are arranged in a single table but with separate conformance statements for low-speed and high-speed interfaces, consistent with [IFMIB]. 3.3.3. Absolute Drop Action This action just silently discards all traffic presented to it, without counting it. This action has no additional parameters and so is represented only as a diffServActionSpecific pointing to diffServAbsoluteDropAction without any specific parameters. 3.4. Queueing Elements These include Algorithmic Droppers, Queues and Schedulers which are all inter-related in their use of queueing techniques. 3.4.1. Algorithmic Dropper Table Algorithmic Droppers have a close relationship with queueing: they are represented in this MIB by entries in an Algorithmic Dropper Table. Entries contain a diffServAlgDropNext attribute which indicates to which queue they sink their traffic. An Algorithmic Dropper is assumed to operate indiscriminately on all packets that are presented at its input. If it is necessary to perform additional classification on the stream then a separate TCB must be introduced at this point: Classifier elements here can then distinguish the different types of traffic on which dropping is to act and the treatment for each type is described by a separate diffServAlgDropEntry. Algorithmic Droppers may also contain a pointer to specific detail of the drop algorithm. This MIB defines the detail for three drop algorithms: Tail Drop, Head Drop and Random Drop; other algorithms are outside the scope of this MIB modele but the general framework is intended to allow for their inclusion via other MIB modules. Baker, Chan, Smith Expires January 2001 [Page 8] Internet Draft Differentiated Services MIB July 2000 One generally-applicable parameter of a dropper is the specification of a queue-depth threshold at which some drop action is to start. This is represented in this MIB, as a base attribute of the Algorithmic Dropper entry, by pointing to the queue for which depth is to be compared and the depth threshold to compare against. o A Tail Dropper requires the specification of a maximum queue depth threshold: when the queue pointed at by diffServAlgDropQMeasure reaches that depth threshold, diffServAlgDropQThresh, any new traffic arriving at the dropper is discarded. This algorithm uses only parameters that are part of the diffServAlgDropEntry. o A Head Dropper requires the specification of a maximum queue depth threshold: when the queue pointed at by diffServAlgDropQMeasure reaches that depth threshold, diffServAlgDropQThresh, traffic currently at the head of the queue is discarded. This algorithm uses only parameters that are part of the diffServAlgDropEntry. o Random Droppers are recommended as a way to control congestion, in [QUEUEMGMT] and called for in the [AF-PHB]. Various implementations exist, which agree on marking or dropping just enough traffic to communicate with TCP-like protocols about congestion avoidance, but differ markedly on their specific parameters. This MIB attempts to offer a minimal set of controls for any random dropper, but expects that vendors will augment the table with additional controls and status in accordance with their implementation. This algorithm requires additional parameters on top of those in diffServAlgDropEntry: these are discussed below. 3.4.2. Random Dropper Table One example of a random dropper is a RED-like dropper. An example of the representation chosen in this MIB for this element is shown in Figure 1. Random droppers often have their drop probability function described as a plot of drop probability (P) against averaged queue length (Q). (Qmin,Pmin) then defines the start of the characteristic plot. Normally Pmin=0, meaning with average queue length below Qmin, there will be no drops. (Qmax,Pmax) defines a "knee" on the plot, after which point the drop probability become more progressive (greater slope). (Qclip,1) defines the queue length at which all packets will be dropped. Notice this is different from Tail Drop because this uses an averaged queue length. although it is possible for Qclip = Qmax. In the MIB module, diffServRandomDropMinThreshBytes and diffServRandomDropMinThreshPkts represent Qmin. diffServRandomDropMaxThreshBytes and diffServRandomDropMaxThreshPkts represent Qmax. Baker, Chan, Smith Expires January 2001 [Page 9] Internet Draft Differentiated Services MIB July 2000 +-------------+ +-----------+ --->| Next --------+-->| Next ---------> to Scheduler | Thresh=100k | | | Min=none | | Measure -------+ | Max=none | | Type=random | | Pri=10 | | Specif -------+ | Type=fifo | +-------------+ | +-----------+ AlgDrop.3 | Queue.ifIndex.4 | | +--------------+ +-->| Minthresh=10k| | Maxthresh=80k| | Weight=1/16 | | ProbMax= 0.5 | +--------------+ RandomDrop.3 Figure 1: Example Use of the RandomDropTable for Random Droppers diffServRandomDropProbMax represents Pmax. This MIB does not represent Pmin (assumed to be zero unless otherwise represented) or Qclip (assumed to be Qmax unless otherwise represented). Each random dropper specification is associated with a queue. This allows multiple drop processes (of same or different types) be associated with the same queue, as different PHB implementations may require. This also allows for sequences of multiple droppers if necessary. The calculation of a smoothed queue length may also have an important bearing on the behaviour of the dropper: parameters may include the sampling interval and the weight of each sample. The performance may be very sensitive to the values of these parameters and a wide range of possible values may be required due to a wide range of link speeds. Most algorithms include a sample weight, represented here by diffServRandomDropInvWeight. Note however that there is ongoing research on this topic, see e.g. [ACTQMGMT]. Additional parameters may be added in an enterprise MIB module, e.g. by using AUGMENTS on this table, to handle aspects of random drop algorithms that are not standardised here. NOTE: Deterministic Droppers can be viewed as a special case of Random Droppers with the drop probability restricted to 0 and 1. Hence Deterministic Droppers might be described by a Random Dropper with Pmin Baker, Chan, Smith Expires January 2001 [Page 10] Internet Draft Differentiated Services MIB July 2000 = 0, Pmax = 1, Qmin = Qmax = Qclip, the averaged queue length at which dropping occurs. 3.4.3. Queues and Schedulers The Queue Table models simple FIFO queues, as described in [MODEL] section 7.1.1. The Scheduler Table allows flexibility in constructing both simple and somewhat more complex queueing hierarchies from those queues. Of course, since TCBs can be cascaded multiple times on an interface, even more complex hierarchies can be constructed that way also. The entries in the Queue Table have attributes which include a specification of the scheduler which services the queue. They are pointed at by the "next" attributes of the upstream elements e.g. diffServMeterSucceedNext. Note that multiple upstream elements may direct their traffic to the same Queue Table entry. For example, the Assured Forwarding PHB suggests that all traffic marked AF11, AF12 or AF13 be placed in the same queue, after metering, without reordering. This would be represented by having the diffServMeterSucceedNext of each upstream meter point at the same entry in the Queue Table. The Scheduler Table represented in this MIB module contains entries, each of which represents the algorithm in use for servicing the one or more queues that feed it. The [MODEL] section 7.1.2 describes a scheduler with multiple inputs: this is represented in the MIB by including the scheduling parameters associated with a scheduler input in the Queue Table entry that feeds it and having that point at one particular Scheduler Table entry. In this way, sets of Queues can be grouped together as inputs to the same Scheduler. This table serves to represent the example scheduler described in the [MODEL]: other more complex representations might be created outside of this MIB. Each scheduler input, as represented by a Queue Table entry, is assigned a priority with respect to all the other inputs feeding the same scheduler. A higher-priority input will be serviced first over a lower- priority input, assuming that all guarantees have already been met. This priority parameter, used on its own with default values for the other parameters, serves to allow representation of a Strict Priority scheduler. For Weighted Queueing algorithms e.g. WFQ, WRR, the "weight" of a given scheduler input is represented with a Minimum Service Rate leaky-bucket profile which provides guaranteed bandwidth to that input, if required. This is represented, as were token-bucket meters, by a rate diffServQueueMinRateAbs and a burst size diffServQueueMinBurstSize. The rate may, alternatively, be represented by a relative value, as a Baker, Chan, Smith Expires January 2001 [Page 11] Internet Draft Differentiated Services MIB July 2000 fraction of the interface's current line rate, diffServQueueMinRateRel to assist in cases where line rates are variable or where a higher-level policy might be expressed in terms of fractions of network resources. The two rate parameters are inter-related and changes in one may be reflected in the other. An input may also be capable of acting as a non-work-conserving [MODEL] traffic shaper: this is done by defining a Maximum Service Rate leaky- bucket profile in order to limit the scheduler bandwidth available to that input. This is represented, similarly to the minimum rate, by a rate diffServQueueMaxRateAbs and a burst size diffServQueueMaxBurstSize. The rate may, alternatively, be represented by a relative value, as a fraction of the interface's current line rate, diffServQueueMaxRateRel. 3.4.4. Example of Algorithmic Droppers, Queues and Schedulers As an example, the hypothetical queue/scheduler configuration shown in [MODEL] section 8.1 is shown in Table 1. Queues 1 and 3 are serviced for long enough to give them their promised bandwidths and burst sizes, if they need them. Queue 2 is then serviced up to its maximum limit profile. Only then does Queue 4 get an opportunity to send its traffic. As an example of the use of the MIB structures, Figure 2 shows how the example would be represented. QId MinRate MaxRate Priority Scheduler --- ---------------- ---------------- -------- --------- 1 100kbps/20kbyte none/none 20 Scheduler.1 2 none/none 100kbps/100kbyte 40 Scheduler.1 3 200kbps/20kbyte none/none 20 Scheduler.1 4 none/none none/none 10 Scheduler.1 SchedId Type ------- ------------------ 1 weightedRoundRobin Table 1: Example Queue and Scheduler Parameters Baker, Chan, Smith Expires January 2001 [Page 12] Internet Draft Differentiated Services MIB July 2000 +-----------+ ----------------------->| Next -----+ | Min=Profl4| | | Max=none | | | Pri=20 | | | Type=fifo | | +-----------+ | Queue.ifIndex.1 | | +-----------+ +-----------+ | --->| Next -----+--->| Next ------+ | Thresh=1k | | | Min=none | | | Measure -----+ | Max=Profl5| | | Type=Tail | | Pri=40 | | | Spec=none | | Type=fifo | | +----------+ +-----------+ +-----------+ +--->| Next -----> 0.0 Dropper.1 Queue.ifIndex.2 | | Algrm=wrr| or next TCB | +----------+ +-----------+ +-----------+ | Scheduler.ifIndex.1 --->| Next -----+--->| Next -----+ | Thresh=2k | | | Min=Profl3| | | Measure -----+ | Max=none | | | Type=Tail | | Pri=20 | | | Spec=none | | Type=fifo | | +-----------+ +-----------+ | Dropper.2 Queue.ifIndex.3 | | +-----------+ +-----------+ | --->| Next ------+--->| Next -----+ | Thresh=4k | | | Min=none | | Measure -----+ | Max=none | | Type=Tail | | Pri=10 | | Spec=none | | Type=fifo | +-----------+ +-----------+ Dropper.3 Queue.ifIndex.4 Figure 2: Example of the use of Queueing elements 4. Conventions used in this MIB 4.1. The use of RowPointer RowPointer is a textual convention used to identify a conceptual row in an SNMP Table by pointing to one of its objects. In this MIB, it is used in two ways: to indicate indirection and to indicate succession. Baker, Chan, Smith Expires January 2001 [Page 13] Internet Draft Differentiated Services MIB July 2000 When used for indirection as in the diffServClassifierTable, the idea is to allow other MIBs, including proprietary ones, to define new and arcane classifiers - MAC headers, IPv4 and IPv6 headers, BGP Communities and all sorts of other things - whilst still utilising the structures of this MIB. This is a form of class inheritance (in "object oriented" language): it allows base object definitions ("classes") to be extended in proprietary or standard ways, in the future, by other documents. When used for succession, it answers the question "what happens next?". Rather than presume that the next table must be as specified in the conceptual model [MODEL] and providing its index, the RowPointer takes you to the MIB row representing that thing. In the diffServMeterTable, for example, the diffServMeterFailNext RowPointer might take you to another meter, while the diffServMeterSucceedNext RowPointer would take you to an action. NOTE -- the RowPointer construct is used to build the TCBs described in [MODEL]: this MIB does not model TCBs directly - it operates at a lower level of abstraction using only individual elements, connected in succession by RowPointers. Therefore, the concept of TCBs enclosing individual functional datapath elements is not applicable to this MIB, although such a concept may be employed by management tools that use this MIB. It is possible that a path through a device following a set of RowPointers is indeterminate i.e. it ends in a dangling RowPointer (or potentially does in the case of a Meter element) should be treated by the agent as if it were operationally deactivated. For example, if an Action element has a dangling diffServActionNext RowPointer that does not point to an existent table entry (and is not zeroDotZero), then none of the subsequent elements in that particular chain should have any effect on the traffic proceeding down this chain and the Classification or Meter element which lead to this Action element is not considered to be active. Other parts of the device configuration remain in effect, of course, but this rule simply removes all ambiguity from the operational system. 4.2. Conceptual row creation and deletion A number of conceptual tables defined in this MIB use as an index an arbitrary integer value, unique across the scope of the agent. In order to help with multi-manager row-creation problems, a mechanism must be provided to allow a manager to obtain unique values for such an index and to ensure that, when used, the manager knows whether it got what it wanted or not. Baker, Chan, Smith Expires January 2001 [Page 14] Internet Draft Differentiated Services MIB July 2000 Typically, such a table has an associated NextFree variable e.g. diffServClassifierNextFree which provides a suitable value for the index of the next row to be created e.g. diffServClassifierId. A special value, 0, is used to indicate that no more entries can be created by the agent. The table also has a columnar Status attribute with RowStatus syntax [6]. If a manager attempts to create a conceptual row in the table (by a SET operation that contains a varbind setting the Status to a value of either createAndGo or createAndWait) and if the agent has sufficient resources and has no other conceptual row with the same indices, the agent will create the row and return success. If the agent has insufficient resources or such a row is already existent then it returns an error. A manager must be prepared to try again in such circumstances, probably by re-reading the NextFree to obtain a new index value in case a second manager had got in between the first manager's read of the NextFree value and the first manager's row-creation attempt. The use of RowStatus is covered in more detail in [6]. 5. Editorial information 5.1. Open Issues resolved in previous drafts (0) Terminology is more in line with [MODEL], [POLTERM] and [DSTERM]. Discarder -> "Algorithmic Dropper", "Monitor" -> "Counter" "Classifier element" -> "Filter" (1) Cascaded token-buckets is not equivalent to multi-rate token- bucket: do we need to fix this by allowing a multi-rate TB in the MIB? Or, by defining cascaded buckets to mean "multi-rate". (assume the latter - see text in 2.3) (2) Markers: model only describes DSCP-markers: do we need to be able to extend this to other sorts (e.g. 802.1p), even if we do not represent them in this MIB today? (yes). No MIB changes, just words. (3) Counters: should specific blocks include their own or is a "counter action", as described in the Model, sufficient to count all paths through a device? (as appropriate). Per-queue counters are derivable from "action" ones. Per-classifier counters: may feed through from clasifiers to distinct counter actions. Baker, Chan, Smith Expires January 2001 [Page 15] Internet Draft Differentiated Services MIB July 2000 (4) Queue Sets: are these generally applicable? (no). The example in section 2.5.1 is hard to follow: we should describe this example in [MODEL] and then show how it maps to MIB in the MIB draft. - DONE (5) Do we need scheduling units of "packets"? (NO) Should we use "kbps" or just "bps" for rates? DONE - all rates are in kbps. (6) Are "absolute" rates sufficient or should we include "relative to line speed" ones as well? (yes) - DONE - explained that these are interrelated. (7) Scheduler weights vs. rates vs. priorities: this is confusing - suggest we stick to rates and priorities (see Model draft 7.1.2) - DONE. (8) Queue Measure table: o This allows for RIO - multiple averaging functions for the same queue: is this needed? OUT OF SCOPE. o mixes config with status objects - split these? N/A. o do we need floating-point representation for "weight"? N/A. o do we need MIB visibility for average queue depth? N/A. o do we need MIB-configurable averaging functions (sample weight/interval)? (maybe just "sample weight") - NO: averaging functions will be left out although framework allows for their inclusion separately. (9) Counter compliance: paste text from IF-MIB re line-speeds. Do you still have to do the low-speed counters for fast interfaces? YES. DONE. (10) Meters: are these mandatory for compliance? NO (11) Discussion material: move most of this to Model draft e.g. most of 3.1, 3.3, "Dropper/discarder" part of 3.4, nearly all of 3.5. Just leave the "how does the MIB map from the Model" parts in the MIB draft, no general discussion. DONE. (12) Counters: merged in 32-bit and 64-bit counters - conformance statements sort out which ones must be implemented. This is consistent with [IFMIB]. DONE. Baker, Chan, Smith Expires January 2001 [Page 16] Internet Draft Differentiated Services MIB July 2000 (13) Droppers: we used to have a common "dropper" table that represented all of: dropAlways, randomDrop, tailDrop with just some parameters valid for the simpler ones. A simpler representation is to define specific dropper tables for each type (e.g. a single OID to point at for dropAlways since it is always the last action in a chain) but this would mean a larger number of (simpler) MIB objects. CHANGES: dropAlways is still an Action but the others are moved to a diffServAlgDropTable. This table can handle tail/head/random drop - others by extension. (14) Should TBMeterTable just AUGMENT the MeterTable, should it use same indices or are separate structures linked by RowPointers preferable? (same indices without RowPointer). (15) Do we need to model multiple queues feeding back into a single dropper algorithm? (yes). If so, the current single-queue pointer and threshold will not be adequate - should we leave them in? They will be useful for many, but not all, dropper algorithms. (yes) (17) We have concepts of "inbound" and "outbound" directions: but if we have a series of multiple TCBs on a given interface for the same direction (allowed by the model) then we do not have a way to indicate "this is the 1st one". Moreover, it is a somewhat convoluted process to then find the 2nd, 3rd etc. ones - you would have to follow the RowPointers to get there: should we explicitly have an index to enable/help these lookup operations? Note: this is not the same issue as needing a "precedence" for each filter entry of a classifier (yes - added another index to classifiers to represent what TCB they operate at for a given interface/direction). 5.2. Open Issues resolved in this draft (13) Droppers: slight change to previous resolution. MIB can now handle tail/head/random drop using diffServAlgDropTable and diffServRandomDropTable. (18) Should manager be allowed to create Queue elements or should agent be in control of this? (the former) (19) Should manager be allowed to create Scheduler elements or should agent be in control of this? (the former) (20) Related to (17) above, do we also need a "TCB index" for elements other than classifiers? (no) Baker, Chan, Smith Expires January 2001 [Page 17] Internet Draft Differentiated Services MIB July 2000 (21) Do we need diffServAlgDropType of both "headDrop" and "tailDrop" or should we just represent the tail dropper by placing a dropper after the queue instead of before the queue, as linked by the diffServQNext and diffServAlgDropNext RowPointers? (the former - dropper is always in front of the queue in this model). (22) Do we need to support RED algorithms for algorithm parameter configuration and monitoring? If so, what variables are needed? (Added diffServRandomDropTable). (24) diffServAlgDropQThreshold needs UNITS (Bytes). (25) Dangling RowPointers: should we mandate that these are never permitted? Or just define the behaviour if they do dangle? (We define it such that elements that have dangling pointers, as well as upstream elements that point to them, are considered "not activated") (26) Discontinuity times for MIB counters - is ifCounterDiscontinuityTime adequate? (no: added diffServCountActDiscontTime). (27) How do we handle dropper algorithms that require additional classification information in order to do their job? If a Classifier is needed then create a new TCB for it at the point just before the dropper: use ordinary Classifier elements in this TCB. (28) Indexing of table entries and uniqueness hints: is TestAndIncr the correct tool to use? (no: RowStatus is the right tool for ensuring uniqueness; use a NextFree variable as a hint). (32) Miscellaneous clarifications - thanks Bob. 5.3. Still Open Issues (16) Should the creation of counter actions be under the control of manager or agent: should a diffServActionEntry and diffServCountActEntry appear by magic (does the agent know what counters it can and cannot maintain on a given interface)? (no) If no, should diffServCountActEntry appear magically when a diffServAction element is created which points at the diffServCountActTable (then would be no need for diffServCountActStatus)? (no) (23) Do daughter entries of derived table entries need to exist independently of the parent? Examples are diffServMeterEntry/diffServTBMeterEntry, Baker, Chan, Smith Expires January 2001 [Page 18] Internet Draft Differentiated Services MIB July 2000 diffServActionEntry/diffServCountActEntry and diffServAlgDropEntry/diffServRandomDropEntry (assume they must be independent of the equivalent entry in diffServMeterTable which points at the TB table - needs diffServTBMeterStatus: daughters must be created explicitly by manager). (30) Related to (17) - multi-manager creation of TCBs: diffServClassifierId is unique across the agent, for all values of diffServClassifierTcb but there is no "next free" variable to report the next TCB to use. This can lead to a race condition when 2 managers are duelling to create entries with the same value of diffServClassifierTcb. There are also legitimate reasons for different managers to be "creating" the *same* TCB so a conventional "next free" is not a good solution. Is this a rare enough occurence given a suitable choice of diffServClassifierTcb e.g. pseudo-random? (yes). (31) When inheritance is needed and parent/daughter share indexing, the parent often points to the daughter using a "Specific" attribute e.g. diffServMeterSpecific, diffServActionSpecific, diffServAlgDropSpecific. If this is a RowPointer and points to the associated row in the daughter's table, there is redundant information which gives scope for additional error cases. So, wherever possible, should we remove this redundant information by making the "Specific" attribute point only to the base of the daughter table and make it an OBJECT IDENTIFIER? The con is that this is an unusual use of MIB pointers (point at table base, not individual entries). 6. MIB Definition DIFF-SERV-MIB DEFINITIONS ::= BEGIN IMPORTS Unsigned32, Counter32, Counter64, OBJECT-TYPE, MODULE-IDENTITY, OBJECT-IDENTITY, zeroDotZero, mib-2 FROM SNMPv2-SMI TEXTUAL-CONVENTION, RowStatus, RowPointer, TimeStamp FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF ifIndex FROM IF-MIB InetAddressType, InetAddress FROM INET-ADDRESS-MIB Baker, Chan, Smith Expires January 2001 [Page 19] Internet Draft Differentiated Services MIB July 2000 BurstSize FROM INTEGRATED-SERVICES-MIB; diffServMib MODULE-IDENTITY LAST-UPDATED "200007130000Z" ORGANIZATION "IETF Diffserv WG" CONTACT-INFO " Brian Carpenter (co-chair of Diffserv WG) c/o iCAIR 1890 Maple Ave, #150 Evanston, IL 60201, USA Phone: +1 847 467 7811 E-mail: brian@icair.org Kathleen Nichols (co-chair of Diffserv WG) Packet Design E-mail: nichols@packetdesign.com Fred Baker (author) Cisco Systems 519 Lado Drive Santa Barbara, CA 93111, USA E-mail: fred@cisco.com Kwok Ho Chan (author) Nortel Networks 600 Technology Park Drive Billerica, MA 01821, USA E-mail: khchan@nortelnetworks.com Andrew Smith (author) E-mail: ah_smith@pacbell.net" DESCRIPTION "This MIB defines the objects necessary to manage a device that uses the Differentiated Services Architecture described in RFC 2475 and the Informal Management Model for DiffServ Routers in draft-ietf-diffserv-model-04.txt." REVISION "200007130000Z" DESCRIPTION "Initial version, published as RFC xxxx." ::= { mib-2 12345 } -- anybody who uses this unassigned -- number deserves the wrath of IANA diffServObjects OBJECT IDENTIFIER ::= { diffServMib 1 } diffServTables OBJECT IDENTIFIER ::= { diffServMib 2 } diffServMIBConformance OBJECT IDENTIFIER ::= { diffServMib 3 } Baker, Chan, Smith Expires January 2001 [Page 20] Internet Draft Differentiated Services MIB July 2000 -- These textual conventions have no effect on either the syntax -- nor the semantics of any managed object. Objects defined -- using this convention are always encoded by means of the -- rules that define their primitive type. Dscp ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "The IP header Diffserv Code-Point that may be used for discriminating or marking a traffic stream. The value -1 is used to indicate a wildcard i.e. any value." SYNTAX INTEGER (-1 | 0..63) SixTupleClfrL4Port ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "A value indicating a Layer-4 protocol port number." SYNTAX INTEGER (0..65535) IfDirection ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "Specifies a direction of data travel on an interface. 'inbound' traffic is operated on during reception from the interface, while 'outbound' traffic is operated on prior to transmission on the interface." SYNTAX INTEGER { inbound(1), -- ingress interface outbound(2) -- egress interface } Baker, Chan, Smith Expires January 2001 [Page 21] Internet Draft Differentiated Services MIB July 2000 -- -- Classifiers -- -- -- Classifier Table -- -- The Classifier Table allows us to enumerate the relationship -- between arbitrary classifiers and the subsequent downstream -- Diffserv elements. diffServClassifierTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServClassifierEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The classifier table defines the classifiers that are applied to traffic arriving at this interface in a particular direction. Specific classifiers are defined by RowPointers in the entries of this table which identify entries in filter tables of specific types, e.g. Multi-Field Classifiers (MFCs) for IP are defined in the diffServSixTupleClfrTable. Other classifier types may be defined elsewhere." REFERENCE "[MODEL] section 4.1" ::= { diffServTables 1 } diffServClassifierEntry OBJECT-TYPE SYNTAX DiffServClassifierEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the classifier table describes a single element of the classifier." INDEX { ifIndex, diffServClassifierIfDirection, diffServClassifierTcb, diffServClassifierId } ::= { diffServClassifierTable 1 } DiffServClassifierEntry ::= SEQUENCE { diffServClassifierIfDirection IfDirection, diffServClassifierTcb Unsigned32, diffServClassifierId Unsigned32, diffServClassifierFilter RowPointer, diffServClassifierNext RowPointer, diffServClassifierPrecedence Unsigned32, diffServClassifierStatus RowStatus Baker, Chan, Smith Expires January 2001 [Page 22] Internet Draft Differentiated Services MIB July 2000 } diffServClassifierIfDirection OBJECT-TYPE SYNTAX IfDirection MAX-ACCESS not-accessible STATUS current DESCRIPTION "Specifies the direction for which this classifier entry applies on this interface." ::= { diffServClassifierEntry 1 } diffServClassifierTcb OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "Specifies the TCB of which this classifier element is a part. Lower numbers indicate an element that belongs to a classifier that is part of a TCB that is, at least conceptually, applied to traffic before those with higher numbers - this is necessary to resolve ambiguity in cases where different TCBs contain filters that overlap with each other. A manager wanting to create a new TCB should either first search this table for existing entries and pick a value for this variable that is not currently represented - some form of pseudo- random choice is likely to minimise collisions. After successful creation of a conceptual row using the chosen value, the manager should check again that there are no other rows with this value that have been created by a different manager that could, potentially, interfere with the classifier elements that are desired." ::= { diffServClassifierEntry 2 } diffServClassifierId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "A classifier ID that enumerates the classifier elements. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServClassifierNextFree." ::= { diffServClassifierEntry 3 } diffServClassifierFilter OBJECT-TYPE SYNTAX RowPointer Baker, Chan, Smith Expires January 2001 [Page 23] Internet Draft Differentiated Services MIB July 2000 MAX-ACCESS read-create STATUS current DESCRIPTION "A pointer to a valid entry in another table that describes the applicable classification filter, e.g. an entry in diffServSixTupleClfrTable. If the row pointed to does not exist, the classifier is ignored. The value zeroDotZero is interpreted to match anything not matched by another classifier - only one such entry may exist in this table." DEFVAL { zeroDotZero } ::= { diffServClassifierEntry 4 } diffServClassifierNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This selects the next datapath element to handle packets matching the filter pattern. For example, this can point to an entry in a meter, action, algorithmic dropper or queue table. If the row pointed to does not exist, the classifier element is ignored." ::= { diffServClassifierEntry 5 } diffServClassifierPrecedence OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The relative precedence in which classifiers are applied: higher numbers represent classifiers with higher precedence. Classifiers with the same precedence must be unambiguous i.e. they must define non-overlapping patterns, and are considered to be applied simultaneously to the traffic stream. Classifiers with different precedence may overlap in their filters: the classifier with the highest precedence that matches is taken. On a given interface, there must be a complete classifier in place at all times for the first TCB (lowest value of diffServClassifierTcb) in the ingress direction. This means that there will always be one or more filters that match every possible pattern that could be presented in an incoming packet. There is no such requirement for subsequent TCBs in the ingress direction, nor for any TCB in the egress direction." Baker, Chan, Smith Expires January 2001 [Page 24] Internet Draft Differentiated Services MIB July 2000 DEFVAL { 0 } ::= { diffServClassifierEntry 6 } diffServClassifierStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a classifier. Any writable variable may be modified whether the row is active or notInService." ::= { diffServClassifierEntry 7 } diffServClassifierNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently-unused for a diffServClassifierId instance. If a configuring system attempts to create a new row in the diffServClassifierTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServObjects 1 } -- -- IP Six-Tuple Classification Table -- -- Classification based on 6 different fields in the IP -- header. This is intended to be IP-version-independent. -- diffServSixTupleClfrTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServSixTupleClfrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table of IP Six-Tuple Classifier filter entries that a system may use to identify IP traffic." REFERENCE "[MODEL] section 4.2.2" ::= { diffServTables 2 } diffServSixTupleClfrEntry OBJECT-TYPE SYNTAX DiffServSixTupleClfrEntry MAX-ACCESS not-accessible Baker, Chan, Smith Expires January 2001 [Page 25] Internet Draft Differentiated Services MIB July 2000 STATUS current DESCRIPTION "An IP Six-Tuple Classifier entry describes a single filter." INDEX { diffServSixTupleClfrId } ::= { diffServSixTupleClfrTable 1 } DiffServSixTupleClfrEntry ::= SEQUENCE { diffServSixTupleClfrId Unsigned32, diffServSixTupleClfrDstAddrType InetAddressType, diffServSixTupleClfrDstAddr InetAddress, diffServSixTupleClfrDstAddrMask Unsigned32, diffServSixTupleClfrSrcAddrType InetAddressType, diffServSixTupleClfrSrcAddr InetAddress, diffServSixTupleClfrSrcAddrMask Unsigned32, diffServSixTupleClfrDscp Dscp, diffServSixTupleClfrProtocol INTEGER, diffServSixTupleClfrDstL4PortMin SixTupleClfrL4Port, diffServSixTupleClfrDstL4PortMax SixTupleClfrL4Port, diffServSixTupleClfrSrcL4PortMin SixTupleClfrL4Port, diffServSixTupleClfrSrcL4PortMax SixTupleClfrL4Port, diffServSixTupleClfrStatus RowStatus } diffServSixTupleClfrId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "A unique identifier for the filter. Filters may be shared by multiple interfaces in the same system. Managers should obtain new values for row creation in this table by reading diffServSixTupleClfrNextFree." ::= { diffServSixTupleClfrEntry 1 } diffServSixTupleClfrDstAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "The type of IP destination address used by this classifier entry." ::= { diffServSixTupleClfrEntry 2 } diffServSixTupleClfrDstAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current Baker, Chan, Smith Expires January 2001 [Page 26] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "The IP address to match against the packet's destination IP address." ::= { diffServSixTupleClfrEntry 3 } diffServSixTupleClfrDstAddrMask OBJECT-TYPE SYNTAX Unsigned32 UNITS "bits" MAX-ACCESS read-create STATUS current DESCRIPTION "The length of a mask for the matching of the destination IP address. Masks are constructed by setting bits in sequence from the most-significant bit downwards for diffServSixTupleClfrDstAddrMask bits length. All other bits in the mask, up to the number needed to fill the length of the address diffServSixTupleClfrDstAddr are cleared to zero. A zero bit in the mask then means that the corresponding bit in the address always matches." DEFVAL {0} ::= { diffServSixTupleClfrEntry 4 } diffServSixTupleClfrSrcAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "The type of IP source address used by this classifier entry." ::= { diffServSixTupleClfrEntry 5 } diffServSixTupleClfrSrcAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The IP address to match against the source IP address of each packet." ::= { diffServSixTupleClfrEntry 6 } diffServSixTupleClfrSrcAddrMask OBJECT-TYPE SYNTAX Unsigned32 UNITS "bits" MAX-ACCESS read-create STATUS current DESCRIPTION "The length of a mask for the matching of the source IP address. Masks are constructed by setting bits in sequence from the most- Baker, Chan, Smith Expires January 2001 [Page 27] Internet Draft Differentiated Services MIB July 2000 significant bit downwards for diffServSixTupleClfrSrcAddrMask bits length. All other bits in the mask, up to the number needed to fill the length of the address diffServSixTupleClfrSrcAddr are cleared to zero. A zero bit in the mask then means that the corresponding bit in the address always matches." DEFVAL {0} ::= { diffServSixTupleClfrEntry 7 } diffServSixTupleClfrDscp OBJECT-TYPE SYNTAX Dscp MAX-ACCESS read-create STATUS current DESCRIPTION "The value that the DSCP in the packet must have to match this entry. A value of -1 indicates that a specific DSCP value has not been defined and thus all DSCP values are considered a match." DEFVAL {-1} ::= { diffServSixTupleClfrEntry 8 } diffServSixTupleClfrProtocol OBJECT-TYPE SYNTAX INTEGER (0..255) MAX-ACCESS read-create STATUS current DESCRIPTION "The IP protocol to match against the IPv4 protocol number in the packet. A value of zero means match all." DEFVAL {0} ::= { diffServSixTupleClfrEntry 9 } diffServSixTupleClfrDstL4PortMin OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum value that the layer-4 destination port number in the packet must have in order to match this classifier entry." DEFVAL {0} ::= { diffServSixTupleClfrEntry 10 } diffServSixTupleClfrDstL4PortMax OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum value that the layer-4 destination port number in the packet must have in order to match this classifier entry. This value must be equal to or greater that the value specified Baker, Chan, Smith Expires January 2001 [Page 28] Internet Draft Differentiated Services MIB July 2000 for this entry in diffServSixTupleClfrDstL4PortMin." DEFVAL {65535} ::= { diffServSixTupleClfrEntry 11 } diffServSixTupleClfrSrcL4PortMin OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum value that the layer-4 source port number in the packet must have in order to match this classifier entry." DEFVAL {0} ::= { diffServSixTupleClfrEntry 12 } diffServSixTupleClfrSrcL4PortMax OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum value that the layer-4 source port number in the packet must have in oder to match this classifier entry. This value must be equal to or greater that the value specified for this entry in dsSixTupleIpSrcL4PortMin." DEFVAL {65535} ::= { diffServSixTupleClfrEntry 13 } diffServSixTupleClfrStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a classifier. Any writable variable may be modified whether the row is active or notInService." ::= { diffServSixTupleClfrEntry 14 } diffServSixTupleClfrNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently-unused for a diffServSixTupleClfrId instance. If a configuring system attempts to create a new row in the diffServSixTupleClfrTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." Baker, Chan, Smith Expires January 2001 [Page 29] Internet Draft Differentiated Services MIB July 2000 ::= { diffServObjects 2 } Baker, Chan, Smith Expires January 2001 [Page 30] Internet Draft Differentiated Services MIB July 2000 -- -- Meters -- -- This MIB includes definitions for a generic Meter -- Table as well as specific definitions for Token- -- Bucket Meters, as one example of possible meters. -- diffServMeterTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table enumerates generic meters that a system may use to police a stream of traffic. The traffic stream to be metered is determined by the element(s) upstream of the meter i.e. by the object(s) that point to each entry in this table. This may include all traffic on an interface. Specific meter details are to be found in diffServMeterSpecific." REFERENCE "[MODEL] section 5.1" ::= { diffServTables 3 } diffServMeterEntry OBJECT-TYPE SYNTAX DiffServMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the meter table describing a single meter." INDEX { ifIndex, diffServMeterIfDirection, diffServMeterId } ::= { diffServMeterTable 1 } DiffServMeterEntry ::= SEQUENCE { diffServMeterIfDirection IfDirection, diffServMeterId Unsigned32, diffServMeterSucceedNext RowPointer, diffServMeterFailNext RowPointer, diffServMeterSpecific OBJECT IDENTIFIER, diffServMeterStatus RowStatus } diffServMeterIfDirection OBJECT-TYPE SYNTAX IfDirection MAX-ACCESS not-accessible STATUS current Baker, Chan, Smith Expires January 2001 [Page 31] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "Specifies the direction for which this meter entry applies on this interface." ::= { diffServMeterEntry 1 } diffServMeterId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "This identifies a meter entry. Managers should obtain new values for row creation in this table by reading diffServMeterNextFree." ::= { diffServMeterEntry 2 } diffServMeterSucceedNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "If the traffic does conform to the meter, this indicates the next datapath element to handle the traffic e.g. an Action or another Meter datapath element. The value zeroDotZero in this variable indicates no further Diffserv treatment is performed on this traffic by the current interface for this interface direction. If the row pointed to does not exist, the meter element is considered inactive." DEFVAL { zeroDotZero } ::= { diffServMeterEntry 3 } diffServMeterFailNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "If the traffic does not conform to the meter, this indicates the next datapath element to handle the traffic e.g. an Action or Meter datapath element. The value zeroDotZero in this variable indicates no further Diffserv treatment is performed on this traffic by the current interface for this interface direction. If the row pointed to does not exist, the meter element is considered inactive." DEFVAL { zeroDotZero } ::= { diffServMeterEntry 4 } diffServMeterSpecific OBJECT-TYPE Baker, Chan, Smith Expires January 2001 [Page 32] Internet Draft Differentiated Services MIB July 2000 SYNTAX OBJECT IDENTIFIER MAX-ACCESS read-create STATUS current DESCRIPTION "This indicates the behaviour of the meter by pointing to a table containing detailed parameters. Note that entries in that specific table must be managed explicitly. One example of a valid object would be diffServTBMeterTable, whose entries are indexed by the same variables as this table, for describing an instance of a token-bucket meter." ::= { diffServMeterEntry 5 } diffServMeterStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a meter. Any writable variable may be modified whether the row is active or notInService." ::= { diffServMeterEntry 6 } diffServMeterNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently-unused for a diffServMeterId instance. If a configuring system attempts to create a new row in the diffServMeterTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServObjects 3 } -- -- Token-Bucket Meter Table -- diffServTBMeterTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServTBMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table enumerates specific token-bucket meters that a system may use to police a stream of traffic. Such meters are modelled here as having a single rate and a burst size. Baker, Chan, Smith Expires January 2001 [Page 33] Internet Draft Differentiated Services MIB July 2000 Multiple meter elements may be logically cascaded using their diffServMeterSucceedNext pointers if a multi-rate token bucket is needed. One example of this might be for an AF PHB implementation that used two-rate meters. Such cascading of meter elements of specific type of token-bucket indicates forwarding behaviour that is functionally equivalent to a multi- rate meter: the sequential nature of the representation is merely a notational convenience for this MIB. Entries in this table share indexing with a parent diffServMeterEntry although they must be managed (e.g. created/deleted) by explicit management action, independently of the associated value of diffServMeterSpecific." REFERENCE "[MODEL] section 5.1.3" ::= { diffServTables 4 } diffServTBMeterEntry OBJECT-TYPE SYNTAX DiffServTBMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry that describes a single token-bucket meter, indexed by the same variables as a diffServMeterEntry." INDEX { ifIndex, diffServMeterIfDirection, diffServMeterId } ::= { diffServTBMeterTable 1 } DiffServTBMeterEntry ::= SEQUENCE { diffServTBMeterRate Unsigned32, diffServTBMeterBurstSize BurstSize diffServTBMeterStatus RowStatus } diffServTBMeterRate OBJECT-TYPE SYNTAX Unsigned32 UNITS "kilobits per second" MAX-ACCESS read-create STATUS current DESCRIPTION "The token-bucket rate, in kilobits per second (kbps)." ::= { diffServTBMeterEntry 1 } diffServTBMeterBurstSize OBJECT-TYPE SYNTAX BurstSize UNITS "Bytes" MAX-ACCESS read-create Baker, Chan, Smith Expires January 2001 [Page 34] Internet Draft Differentiated Services MIB July 2000 STATUS current DESCRIPTION "The maximum number of bytes in a single transmission burst. The interval over which the burst is to be measured can be derived as diffServTBMeterBurstSize*8*1000/diffServTBMeterRate." ::= { diffServTBMeterEntry 2 } diffServTBMeterStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a meter. Any writable variable may be modified whether the row is active or notInService." ::= { diffServTBMeterEntry 3 } Baker, Chan, Smith Expires January 2001 [Page 35] Internet Draft Differentiated Services MIB July 2000 -- -- Actions -- -- -- The Action Table allows enumeration of the different -- types of actions to be applied to a traffic flow. -- diffServActionTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServActionEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The Action Table enumerates actions that can be performed to a stream of traffic. Multiple actions can be concatenated. For example, after marking a stream of traffic exiting from a meter, a device can then perform a count action of the conforming or non-conforming traffic. Specific actions are indicated by diffServActionSpecific which points to another object which describes the action in further detail." REFERENCE "[MODEL] section 6." ::= { diffServTables 5 } diffServActionEntry OBJECT-TYPE SYNTAX DiffServActionEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the action table describing the actions applied to traffic arriving at its input." INDEX { ifIndex, diffServActionIfDirection, diffServActionId } ::= { diffServActionTable 1 } DiffServActionEntry ::= SEQUENCE { diffServActionIfDirection IfDirection, diffServActionId Unsigned32, diffServActionNext RowPointer, diffServActionSpecific OBJECT IDENTIFIER, diffServActionStatus RowStatus } diffServActionIfDirection OBJECT-TYPE Baker, Chan, Smith Expires January 2001 [Page 36] Internet Draft Differentiated Services MIB July 2000 SYNTAX IfDirection MAX-ACCESS not-accessible STATUS current DESCRIPTION "Specifies the direction for which this action entry applies on this interface." ::= { diffServActionEntry 1 } diffServActionId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "This identifies the action entry. Managers should obtain new values for row creation in this table by reading diffServActionNextFree." ::= { diffServActionEntry 2 } diffServActionNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "The Next pointer indicates the next datapath element to handle the traffic. For example, a queue datapath element. The value zeroDotZero in this variable indicates no further DiffServ treatment is performed on this flow by the current interface for this interface direction. If the row pointed to does not exist, the action element is considered inactive." DEFVAL { zeroDotZero } ::= { diffServActionEntry 3 } diffServActionSpecific OBJECT-TYPE SYNTAX OBJECT IDENTIFIER MAX-ACCESS read-create STATUS current DESCRIPTION "A pointer to an object instance providing additional information for the type of action indicated by this action table entry. For the standard actions defined by this MIB module, this should point to one of the following: a diffServDscpMarkActEntry, a diffServCountActEntry, the diffServAbsoluteDropAction OID. For other actions, it may point to an object instance defined in some other MIB." ::= { diffServActionEntry 4 } Baker, Chan, Smith Expires January 2001 [Page 37] Internet Draft Differentiated Services MIB July 2000 diffServActionStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation or deletion of an action element. Any writable variable may be modified whether the row is active or notInService." ::= { diffServActionEntry 5 } diffServActionNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently-unused for a diffServActionId instance. If a configuring system attempts to create a new row in the diffServActionTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServObjects 4 } -- DSCP Mark Action Table -- -- Rows of this table are pointed to by diffServAction to -- provide detailed parameters specific to the DSCP -- Mark action. diffServDscpMarkActTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServDscpMarkActEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table enumerates specific DSCPs used for marking or remarking the DSCP field of IP packets. The entries of this table may be referenced by a diffServActionSpecific attribute that points to diffServDscpMarkActTable." REFERENCE "[MODEL] section 6.1" ::= { diffServTables 6 } diffServDscpMarkActEntry OBJECT-TYPE SYNTAX DiffServDscpMarkActEntry MAX-ACCESS not-accessible STATUS current Baker, Chan, Smith Expires January 2001 [Page 38] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "An entry in the DSCP mark action table that describes a single DSCP used for marking." INDEX { diffServDscpMarkActDscp } ::= { diffServDscpMarkActTable 1 } DiffServDscpMarkActEntry ::= SEQUENCE { diffServDscpMarkActDscp Dscp } diffServDscpMarkActDscp OBJECT-TYPE SYNTAX Dscp MAX-ACCESS read-only STATUS current DESCRIPTION "The DSCP that this Action uses for marking/remarking traffic. Note that a DSCP value of -1 is not permitted in this table. It is quite possible that the only packets subject to this Action are already marked with this DSCP. Note also that Diffserv may result in packet remarking both on ingress to a network and on egress from it and it is quite possible that ingress and egress would occur in the same router." ::= { diffServDscpMarkActEntry 1 } -- -- Count Action Table -- diffServCountActTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServCountActEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains counters for all the traffic passing through an action element." REFERENCE "[MODEL] section 6.5" ::= { diffServTables 7 } diffServCountActEntry OBJECT-TYPE SYNTAX DiffServCountActEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the count action table that describes a single set of traffic counters. Entries in this table share indexing with Baker, Chan, Smith Expires January 2001 [Page 39] Internet Draft Differentiated Services MIB July 2000 those in the base diffServActionTable although they must be managed (e.g. created/deleted) by explicit management action, independently of the associated value of diffServActionSpecific." INDEX { ifIndex, diffServActionIfDirection, diffServActionId } ::= { diffServCountActTable 1 } DiffServCountActEntry ::= SEQUENCE { diffServCountActOctets Counter32, diffServCountActHCOctets Counter64, diffServCountActPkts Counter32, diffServCountActHCPkts Counter64, diffServCountActDiscontTime TimeStamp, diffServCountActStatus RowStatus } diffServCountActOctets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets at the Action datapath element. On high speed devices, this object implements the least significant 32 bits of diffServcountActHCOctets. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 1 } diffServCountActHCOctets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets at the Action datapath element. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 2 } diffServCountActPkts OBJECT-TYPE SYNTAX Counter32 Baker, Chan, Smith Expires January 2001 [Page 40] Internet Draft Differentiated Services MIB July 2000 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets at the Action datapath element. On high speed devices, this object implements the least significant 32 bits of diffServcountActHCPkts. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 3 } diffServCountActHCPkts OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets at the Action datapath element. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 4 } diffServCountActDiscontTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which any one or more of this entry's counters suffered a discontinuity. If no such discontinuities have occurred since the last re- initialization of the local management subsystem, then this object contains a zero value." ::= { diffServCountActEntry 5 } diffServCountActStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of this entry. Any writable variable may be modified whether the row is active or notInService." Baker, Chan, Smith Expires January 2001 [Page 41] Internet Draft Differentiated Services MIB July 2000 ::= { diffServCountActEntry 6 } diffServAbsoluteDropAction OBJECT-IDENTITY STATUS current DESCRIPTION "This object identifier may be used as the value of a diffServActionSpecific pointer in order to indicate that all packets following this path are to be dropped unconditionally at this point. It is likely, but not required, that this action will be preceded by a counter action." ::= { diffServObjects 6 } Baker, Chan, Smith Expires January 2001 [Page 42] Internet Draft Differentiated Services MIB July 2000 -- -- Algorithmic Drop Table -- diffServAlgDropTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServAlgDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The algorithmic drop table contains entries describing an element that drops packets according to some algorithm." REFERENCE "[MODEL] section 7.1.3" ::= { diffServTables 8 } diffServAlgDropEntry OBJECT-TYPE SYNTAX DiffServAlgDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry describes a process that drops packets according to some algorithm. Further details of the algorithm type are to be found in diffServAlgDropType and may be pointed to by diffServAlgDropSpecific." INDEX { ifIndex, diffServAlgDropIfDirection, diffServAlgDropId } ::= { diffServAlgDropTable 1 } DiffServAlgDropEntry ::= SEQUENCE { diffServAlgDropIfDirection IfDirection, diffServAlgDropId Unsigned32, diffServAlgDropType INTEGER, diffServAlgDropNext RowPointer, diffServAlgDropQMeasure RowPointer, diffServAlgDropQThreshold Unsigned32, diffServAlgDropSpecific OBJECT IDENTIFIER, diffServAlgDropOctets Counter32, diffServAlgDropHCOctets Counter64, diffServAlgDropPkts Counter32, diffServAlgDropHCPkts Counter64, diffServAlgDropStatus RowStatus } diffServAlgDropIfDirection OBJECT-TYPE SYNTAX IfDirection MAX-ACCESS not-accessible STATUS current Baker, Chan, Smith Expires January 2001 [Page 43] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "Specifies the direction for which this algorithmic dropper entry applies on this interface." ::= { diffServAlgDropEntry 1 } diffServAlgDropId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "This identifies the drop action entry. Managers should obtain new values for row creation in this table by reading diffServAlgDropNextFree." ::= { diffServAlgDropEntry 2 } diffServAlgDropType OBJECT-TYPE SYNTAX INTEGER { other(1), tailDrop(2), headDrop(3), randomDrop(4) } MAX-ACCESS read-create STATUS current DESCRIPTION "The type of algorithm used by this dropper. A value of tailDrop(2) or headDrop(3) represents an algorithm that is completely specified by this MIB. A value of other(1) requires further specification in some other MIB module. The tailDrop(2) algorithm is described as follows: diffServAlgDropQThreshold represents the depth of the queue diffServAlgDropQMeasure at which all newly arriving packets will be dropped. The headDrop(3) algorithm is described as follows: if a packet arrives when the current depth of the queue diffServAlgDropQMeasure is at diffServAlgDropQThreshold, packets currently at the head of the queue are dropped to make room for the new packet to be enqueued at the tail of the queue. The randomDrop(4) algorithm is described as follows: on packet arrival, an algorithm is executed which may randomly drop the packet, or drop other packet(s) from the queue in its place. The specifics of the algorithm may be proprietary. For this algorithm, an associated diffServRandomDropEntry is indicated by pointing diffServAlgDropSpecific at the diffServRandomDropTable. The relevant entry in that table is selected by the common indexing of the two tables. For this algorithm, diffServAlgQThreshold is understood to be the absolute maximum size of the queue and additional parameters are described in Baker, Chan, Smith Expires January 2001 [Page 44] Internet Draft Differentiated Services MIB July 2000 diffServRandomDropTable." ::= { diffServAlgDropEntry 3 } diffServAlgDropNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "The Next pointer indicates the next datapath element to handle the traffic e.g. a queue datapath element. The value zeroDotZero in this variable indicates no further DiffServ treatment is performed on this flow by the current interface for this interface direction. If the row pointed to does not exist, the algorithmic dropper element is considered inactive." ::= { diffServAlgDropEntry 4 } diffServAlgDropQMeasure OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "Points to an entry in the diffServQueueTable to indicate the queue that a drop algorithm is to monitor when deciding whether to drop a packet. If the row pointed to does not exist, the algorithmic dropper element is considered inactive." ::= { diffServAlgDropEntry 5 } diffServAlgDropQThreshold OBJECT-TYPE SYNTAX Unsigned32 UNITS "Bytes" MAX-ACCESS read-create STATUS current DESCRIPTION "A threshold on the depth in bytes of the queue being measured at which a trigger is generated to the dropping algorithm. For the tailDrop(2) or headDrop(3) algorithms, this represents the depth of the queue diffServAlgDropQMeasure at which the drop action will take place. Other algorithms will need to define their own semantics for this threshold." ::= { diffServAlgDropEntry 6 } diffServAlgDropSpecific OBJECT-TYPE SYNTAX OBJECT IDENTIFIER MAX-ACCESS read-create Baker, Chan, Smith Expires January 2001 [Page 45] Internet Draft Differentiated Services MIB July 2000 STATUS current DESCRIPTION "Points to a table (not an entry in the table) defined elsewhere that provides further detail regarding a drop algorithm. Entries in such a table are indexed by the same variables as this diffServAlgDropEntry but note that those entries must be managed independently of those in this table. Entries with diffServAlgDropType equal to other(1) may have this point to a table defined in another MIB module. Entries with diffServAlgDropType equal to randomDrop(4) must have this point to diffServRandomDropTable. For all other algorithms, this should take the value zeroDotzero." ::= { diffServAlgDropEntry 7 } diffServAlgDropOctets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets that have been dropped by this drop process. On high speed devices, this object implements the least significant 32 bits of diffServAlgDropHCOctets. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this interface." ::= { diffServAlgDropEntry 8 } diffServAlgDropHCOctets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets that have been dropped by this drop process. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this interface." ::= { diffServAlgDropEntry 9 } diffServAlgDropPkts OBJECT-TYPE Baker, Chan, Smith Expires January 2001 [Page 46] Internet Draft Differentiated Services MIB July 2000 SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets that have been dropped by this drop process. On high speed devices, this object implements the least significant 32 bits of diffServAlgDropHCPkts. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this interface." ::= { diffServAlgDropEntry 10 } diffServAlgDropHCPkts OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets that have been dropped by this drop process. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re- initialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this interface." ::= { diffServAlgDropEntry 11 } diffServAlgDropStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of this entry. Any writable variable may be modified whether the row is active or notInService." ::= { diffServAlgDropEntry 12 } diffServAlgDropNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently-unused for a diffServAlgDropId instance. If a configuring system attempts to create a new row in the diffServAlgDropTable using this value, that operation will fail if the value has, in the Baker, Chan, Smith Expires January 2001 [Page 47] Internet Draft Differentiated Services MIB July 2000 meantime, been used to create another row that is currently valid." ::= { diffServObjects 7 } diffServRandomDropTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServRandomDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The random drop table augments the algorithmic drop table. It contains entries describing a process that drops packets randomly. This table is intended to be pointed to by the associated diffServAlgDropSpecific in such cases." REFERENCE "[MODEL] section 7.1.3" ::= { diffServTables 9 } diffServRandomDropEntry OBJECT-TYPE SYNTAX DiffServRandomDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry describes a process that drops packets according to a random algorithm. Entries in this table share indexing with a parent diffServAlgDropEntry although they must be managed (e.g. created/deleted) by explicit management action, independently of the associated value of diffServAlgDropSpecific." INDEX { ifIndex, diffServAlgDropIfDirection, diffServAlgDropId } ::= { diffServRandomDropTable 1 } DiffServRandomDropEntry ::= SEQUENCE { diffServRandomDropMinThreshBytes Unsigned32, diffServRandomDropMinThreshPkts Unsigned32, diffServRandomDropMaxThreshBytes Unsigned32, diffServRandomDropMaxThreshPkts Unsigned32, diffServRandomDropInvWeight Unsigned32, diffServRandomDropProbMax Unsigned32, diffServRandomDropStatus RowStatus } diffServRandomDropMinThreshBytes OBJECT-TYPE SYNTAX Unsigned32 UNITS "bytes" MAX-ACCESS read-create STATUS current Baker, Chan, Smith Expires January 2001 [Page 48] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "The average queue depth in bytes, beyond which traffic has a non-zero probability of being dropped. Changes in this variable may or may not be reflected in the reported value of diffServRandomDropMinThreshPkts." ::= { diffServRandomDropEntry 1 } diffServRandomDropMinThreshPkts OBJECT-TYPE SYNTAX Unsigned32 UNITS "packets" MAX-ACCESS read-create STATUS current DESCRIPTION "The average queue depth in packets, beyond which traffic has a non-zero probability of being dropped. Changes in this variable may or may not be reflected in the reported value of diffServRandomDropMinThreshBytes." ::= { diffServRandomDropEntry 2 } diffServRandomDropMaxThreshBytes OBJECT-TYPE SYNTAX Unsigned32 UNITS "bytes" MAX-ACCESS read-create STATUS current DESCRIPTION "The average queue depth beyond which traffic has a probability indicated by diffServRandomDropInvMaxProb of being dropped or marked. Note that this differs from the physical queue limit, which is stored in diffServAlgDropQThreshold. Changes in this variable may or may not be reflected in the reported value of diffServRandomDropMaxThreshPkts." ::= { diffServRandomDropEntry 3 } diffServRandomDropMaxThreshPkts OBJECT-TYPE SYNTAX Unsigned32 UNITS "packets" MAX-ACCESS read-create STATUS current DESCRIPTION "The average queue depth beyond which traffic has a probability indicated by diffServRandomDropInvMaxProb of being dropped or marked. Note that this differs from the physical queue limit, which is stored in diffServAlgDropQThreshold. Changes in this variable may or may not be reflected in the reported value of diffServRandomDropMaxThreshBytes." ::= { diffServRandomDropEntry 4 } Baker, Chan, Smith Expires January 2001 [Page 49] Internet Draft Differentiated Services MIB July 2000 diffServRandomDropInvWeight OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The weighting of past history in affecting the calculation of the current queue average. The moving average of the queue depth uses the inverse of this value as the factor for the new queue depth, and one minus that inverse as the factor for the historical average. Implementations may choose to limit the acceptable set of values to a specified set, such as powers of 2." ::= { diffServRandomDropEntry 5 } diffServRandomDropProbMax OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The worst case random drop probability, expressed in drops per thousand packets. For example, if every packet may be dropped in the worst case (100%), this has the value 1000. Alternatively, if in the worst case one percent (1%) of traffic may be dropped, it has the value 10." ::= { diffServRandomDropEntry 6 } diffServRandomDropStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of this entry. Any writable variable may be modified whether the row is active or notInService." ::= { diffServRandomDropEntry 7 } Baker, Chan, Smith Expires January 2001 [Page 50] Internet Draft Differentiated Services MIB July 2000 -- -- Queue Table -- diffServQTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServQEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The Queue Table enumerates the individual queues on an interface." ::= { diffServTables 10 } diffServQEntry OBJECT-TYPE SYNTAX DiffServQEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the Queue Table describes a single queue in one direction on an interface." INDEX { ifIndex, diffServQIfDirection, diffServQId } ::= { diffServQTable 1 } DiffServQEntry ::= SEQUENCE { diffServQIfDirection IfDirection, diffServQId Unsigned32, diffServQNext RowPointer, diffServQPriority Unsigned32, diffServQMinRateAbs Unsigned32, diffServQMinRateRel Unsigned32, diffServQMaxRateAbs Unsigned32, diffServQMaxRateRel Unsigned32, diffServQStatus RowStatus } diffServQIfDirection OBJECT-TYPE SYNTAX IfDirection MAX-ACCESS not-accessible STATUS current DESCRIPTION "Specifies the direction for which this queue entry applies on this interface." ::= { diffServQEntry 1 } diffServQId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible Baker, Chan, Smith Expires January 2001 [Page 51] Internet Draft Differentiated Services MIB July 2000 STATUS current DESCRIPTION "The Queue Id enumerates the Queue entry. Managers should obtain new values for row creation in this table by reading diffServQNextFree." ::= { diffServQEntry 2 } diffServQNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "The Next pointer indicates the next datapath element to handle the traffic e.g. a scheduler datapath element. If the row pointed to does not exist, the queue element is considered inactive." ::= { diffServQEntry 3 } diffServQPriority OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The priority of this queue, to be used as a parameter to the next scheduler element downstream from this one." ::= { diffServQEntry 4 } diffServQMinRateAbs OBJECT-TYPE SYNTAX Unsigned32 UNITS "kilobits per second" MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum absolute rate, in kilobits/sec, that a downstream scheduler element should allocate to this queue. If the value is zero, then there is effectively no minimum rate guarantee. If the value is non-zero, the scheduler will assure the servicing of this queue to at least this rate. Note that this attribute's value is coupled to that of diffServQMinRateRel: changes to one will affect the value of the other. They are linked by the following equation: diffServQMinRateRel = diffServQMinRateAbs * 10,000,000/ifSpeed or, if appropriate: Baker, Chan, Smith Expires January 2001 [Page 52] Internet Draft Differentiated Services MIB July 2000 diffServQMinRateRel = diffServQMinRateAbs * 10 / ifHighSpeed" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServQEntry 5 } diffServQMinRateRel OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum rate that a downstream scheduler element should allocate to this queue, relative to the maximum rate of the interface as reported by ifSpeed or ifHighSpeed, in units of 1/10,000 of 1. If the value is zero, then there is effectively no minimum rate guarantee. If the value is non-zero, the scheduler will assure the servicing of this queue to at least this rate. Note that this attribute's value is coupled to that of diffServQMinRateAbs: changes to one will affect the value of the other. They are linked by the following equation: diffServQMinRateAbs = ifSpeed * diffServQMinRateRel/10,000,000 or, if appropriate: diffServQMinRateAbs = ifHighSpeed * diffServQMinRateRel / 10" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServQEntry 6 } diffServQMaxRateAbs OBJECT-TYPE SYNTAX Unsigned32 UNITS "kilobits per second" MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum rate in kilobits/sec that a downstream scheduler element should allocate to this queue. If the value is zero, then there is effectively no maximum rate limit and that the scheduler should attempt to be work-conserving for this queue. If the value is non-zero, the scheduler will limit the servicing of this queue to, at most, this rate in a non-work-conserving manner. Note that this attribute's value is coupled to that of diffServQMaxRateRel: changes to one will affect the value of the other. They are linked by the following equation: Baker, Chan, Smith Expires January 2001 [Page 53] Internet Draft Differentiated Services MIB July 2000 diffServQMaxRateRel = diffServQMaxRateAbs * 10,000,000/ifSpeed or, if appropriate: diffServQMaxRateRel = diffServQMaxRateAbs * 10 / ifHighSpeed" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServQEntry 7 } diffServQMaxRateRel OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum rate that a downstream scheduler element should allocate to this queue, relative to the maximum rate of the interface as reported by ifSpeed or ifHighSpeed, in units of 1/10,000 of 1. If the value is zero, then there is effectively no maximum rate limit and the scheduler should attempt to be work-conserving for this queue. If the value is non-zero, the scheduler will limit the servicing of this queue to, at most, this rate in a non-work-conserving manner. Note that this attribute's value is coupled to that of diffServQMaxRateAbs: changes to one will affect the value of the other. They are linked by the following equation: diffServQMaxRateAbs = ifSpeed * diffServQMaxRateRel/10,000,000 or, if appropriate: diffServQMaxRateAbs = ifHighSpeed * diffServQMaxRateRel / 10" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServQEntry 8 } diffServQStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a queue. Any writable variable may be modified whether the row is active or notInService." ::= { diffServQEntry 9 } diffServQNextFree OBJECT-TYPE Baker, Chan, Smith Expires January 2001 [Page 54] Internet Draft Differentiated Services MIB July 2000 SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently-unused for a diffServQId instance. If a configuring system attempts to create a new row in the diffServQTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServObjects 8 } -- -- Scheduler Table -- -- The Scheduler Table is used for representing packet schedulers: -- it provides flexibility for multiple scheduling algorithms, each -- servicing multiple queues, to be used on the same logical/physical -- interface. diffServSchedulerTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServSchedulerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The Scheduler Table enumerates packet schedulers. Multiple scheduling algorithms can be used on a given interface, with each algorithm described by one diffServSchedulerEntry." REFERENCE "[MODEL] section 7.1.2" ::= { diffServTables 11 } diffServSchedulerEntry OBJECT-TYPE SYNTAX DiffServSchedulerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the Scheduler Table describing a single instance of a scheduling algorithm." INDEX { ifIndex, diffServSchedulerIfDirection, diffServSchedulerId } ::= { diffServSchedulerTable 1 } DiffServSchedulerEntry ::= SEQUENCE { diffServSchedulerIfDirection IfDirection, diffServSchedulerId Unsigned32, diffServSchedulerMethod INTEGER, Baker, Chan, Smith Expires January 2001 [Page 55] Internet Draft Differentiated Services MIB July 2000 diffServSchedulerNext RowPointer, diffServSchedulerStatus RowStatus } diffServSchedulerIfDirection OBJECT-TYPE SYNTAX IfDirection MAX-ACCESS not-accessible STATUS current DESCRIPTION "Specifies the direction for which this scheduler entry applies on this interface." ::= { diffServSchedulerEntry 1 } diffServSchedulerId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "This identifies the scheduler entry. Managers should obtain new values for row creation in this table by reading diffServSchedulerNextFree." ::= { diffServSchedulerEntry 2 } diffServSchedulerMethod OBJECT-TYPE SYNTAX INTEGER { other(1), -- not listed here priorityq(2), -- Priority Queueing wrr(3) -- Weighed Round Robin } MAX-ACCESS read-create STATUS current DESCRIPTION "The scheduling algorithm used by this Scheduler. A value of priorityq(2) is used to indicate strict priority queueing: only the diffServQPriority attributes of the queues feeding this scheduler are used when determining the next packet to schedule. A value of wrr(3) indicates weighted round-robin scheduling. Packets are scheduled from each of the queues feeding this scheduler according to all of the parameters of the diffServQueue entry." REFERENCE "[MODEL] section 7.1.2" ::= { diffServSchedulerEntry 3 } Baker, Chan, Smith Expires January 2001 [Page 56] Internet Draft Differentiated Services MIB July 2000 diffServSchedulerNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "Selects the next data path component, which can be another scheduler or other TC elements. One usage of multiple scheduler elements in series is for Class Base Queueing (CBQ). The value zeroDotZero in this variable indicates no further DiffServ treatment is performed on this flow by the current interface for this interface direction. For example, for an inbound interface the value zeroDotZero indicates that the packet flow has now completed inbound DiffServ treatment and should be forwarded on to the appropriate outbound interface. If the row pointed to does not exist, the scheduler element is considered inactive." DEFVAL { zeroDotZero } ::= { diffServSchedulerEntry 4 } diffServSchedulerStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a queue. Any writable variable may be modified whether the row is active or notInService." ::= { diffServSchedulerEntry 5 } diffServSchedulerNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently-unused for a diffServSchedulerId instance. If a configuring system attempts to create a new row in the diffServSchedulerTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServObjects 9 } Baker, Chan, Smith Expires January 2001 [Page 57] Internet Draft Differentiated Services MIB July 2000 -- -- MIB Compliance statements. -- diffServMIBCompliances OBJECT IDENTIFIER ::= { diffServMIBConformance 1 } diffServMIBGroups OBJECT IDENTIFIER ::= { diffServMIBConformance 2 } diffServMIBCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "This MIB may be implemented as a read-only or as a read-create MIB. As a result, it may be used for monitoring or for configuration." MODULE -- This Module MANDATORY-GROUPS { diffServMIBClassifierGroup, diffServMIBSixTupleClfrGroup, diffServMIBActionGroup, diffServMIBAlgDropGroup, diffServMIBQueueGroup, diffServMIBSchedulerGroup } -- The groups: -- diffServMIBCounterGroup -- diffServMIBHCCounterGroup -- diffServMIBVHCCounterGroup -- -- are mutually exclusive; at most one of these groups is implemented -- for a particular interface. When any of these groups is implemented -- for a particular interface, then ifCounterDiscontinuityGroup from -- [IFMIB] must also be implemented for that interface. -- note that the diffServMIBStaticGroup is -- mandatory for implementations that implement a -- read-write or read-create mode. GROUP diffServMIBCounterGroup DESCRIPTION "This group is mandatory for table objects indexed by ifIndex for which the value of the corresponding instance of ifSpeed is less than or equal to 20,000,000 bits/second." GROUP diffServMIBHCCounterGroup DESCRIPTION "This group is mandatory for table objects indexed by ifIndex for which the value of the corresponding instance of ifSpeed is greater than 20,000,000 bits/second." GROUP diffServMIBVHCCounterGroup DESCRIPTION Baker, Chan, Smith Expires January 2001 [Page 58] Internet Draft Differentiated Services MIB July 2000 "This group is mandatory for table objects indexed by ifIndex for which the value of the corresponding instance of ifSpeed is greater than 650,000,000 bits/second." GROUP diffServMIBMeterGroup DESCRIPTION "This group is mandatory for devices that implement metering functions." GROUP diffServMIBTokenBucketMeterGroup DESCRIPTION "This group is mandatory for devices that implement token-bucket metering functions." GROUP diffServMIBDscpMarkActionGroup DESCRIPTION "This group is mandatory for devices that implement DSCP-Marking functions." GROUP diffServMIBRandomDropGroup DESCRIPTION "This group is mandatory for devices that implement Random Drop functions." GROUP diffServMIBStaticGroup DESCRIPTION "This group is mandatory for devices that allow creation of rows in any of the writable tables of this MIB." OBJECT diffServClassifierFilter MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServClassifierNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServClassifierPrecedence MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServClassifierStatus MIN-ACCESS read-only DESCRIPTION Baker, Chan, Smith Expires January 2001 [Page 59] Internet Draft Differentiated Services MIB July 2000 "Write access is not required." OBJECT diffServSixTupleClfrDstAddrType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstAddr MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstAddrMask MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcAddrType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcAddr MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcAddrMask MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDscp MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrProtocol MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcL4PortMin MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires January 2001 [Page 60] Internet Draft Differentiated Services MIB July 2000 OBJECT diffServSixTupleClfrSrcL4PortMax MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstL4PortMin MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstL4PortMax MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterSucceedNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterFailNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterSpecific MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServTBMeterRate MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServTBMeterBurstSize MIN-ACCESS read-only Baker, Chan, Smith Expires January 2001 [Page 61] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "Write access is not required." OBJECT diffServTBMeterStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServActionNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServActionSpecific MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServActionStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServCountActStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropQMeasure MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropQThreshold MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires January 2001 [Page 62] Internet Draft Differentiated Services MIB July 2000 OBJECT diffServAlgDropSpecific MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropMinThreshBytes MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropMaxThreshPkts MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropMinThreshBytes MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropMaxThreshPkts MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropInvWeight MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropProbMax MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQNext MIN-ACCESS read-only Baker, Chan, Smith Expires January 2001 [Page 63] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "Write access is not required." OBJECT diffServQPriority MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQMinRateAbs MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQMinRateRel MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQMaxRateAbs MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQMaxRateRel MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQueueStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchedulerMethod MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchedulerNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchedulerStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires January 2001 [Page 64] Internet Draft Differentiated Services MIB July 2000 ::= { diffServMIBCompliances 1 } Baker, Chan, Smith Expires January 2001 [Page 65] Internet Draft Differentiated Services MIB July 2000 diffServMIBClassifierGroup OBJECT-GROUP OBJECTS { diffServClassifierFilter, diffServClassifierNext, diffServClassifierPrecedence, diffServClassifierStatus } STATUS current DESCRIPTION "The Classifier Group defines the MIB Objects that describe a generic classifier element." ::= { diffServMIBGroups 1 } diffServMIBSixTupleClfrGroup OBJECT-GROUP OBJECTS { diffServSixTupleClfrDstAddrType, diffServSixTupleClfrDstAddr, diffServSixTupleClfrDstAddrMask, diffServSixTupleClfrDstAddrType, diffServSixTupleClfrSrcAddrType, diffServSixTupleClfrSrcAddrMask, diffServSixTupleClfrDscp, diffServSixTupleClfrProtocol, diffServSixTupleClfrDstL4PortMin, diffServSixTupleClfrDstL4PortMax, diffServSixTupleClfrSrcL4PortMin, diffServSixTupleClfrSrcL4PortMax, diffServSixTupleClfrStatus } STATUS current DESCRIPTION "The Six-tuple Classifier Group defines the MIB Objects that describe a classifier element for matching on 6 fields of an IP and upper-layer protocol header." ::= { diffServMIBGroups 2 } diffServMIBMeterGroup OBJECT-GROUP OBJECTS { diffServMeterSucceedNext, diffServMeterFailNext, diffServMeterSpecific, diffServMeterStatus } STATUS current DESCRIPTION "The Meter Group defines the objects used in describing a generic meter element." ::= { diffServMIBGroups 3 } diffServMIBTokenBucketMeterGroup OBJECT-GROUP OBJECTS { diffServTBMeterRate, diffServTBMeterBurstSize diffServTBMeterStatus } STATUS current DESCRIPTION Baker, Chan, Smith Expires January 2001 [Page 66] Internet Draft Differentiated Services MIB July 2000 "The Token-Bucket Meter Group defines the objects used in describing a single-rate token bucket meter element." ::= { diffServMIBGroups 4 } diffServMIBActionGroup OBJECT-GROUP OBJECTS { diffServActionNext, diffServActionSpecific, diffServActionStatus } STATUS current DESCRIPTION "The Action Group defines the objects used in describing a generic action element." ::= { diffServMIBGroups 5 } diffServMIBDscpMarkActionGroup OBJECT-GROUP OBJECTS { diffServDscpMarkActDscp } STATUS current DESCRIPTION "The DSCP Mark Action Group defines the objects used in describing a DSCP Marking Action element." ::= { diffServMIBGroups 6 } diffServMIBCounterGroup OBJECT-GROUP OBJECTS { diffServCountActOctets, diffServCountActPkts, diffServCountActStatus, diffServAlgDropOctets, diffServAlgDropPkts } STATUS current DESCRIPTION "A collection of objects providing information specific to non- high speed (non-high speed interfaces transmit and receive at speeds less than or equal to 20,000,000 bits/second) packet- oriented network interfaces." ::= { diffServMIBGroups 7 } diffServMIBHCCounterGroup OBJECT-GROUP OBJECTS { diffServCountActOctets, diffServCountActHCOctets, diffServCountActPkts, diffServCountActStatus, diffServAlgDropOctets, diffServAlgDropHCOctets, diffServAlgDropPkts } STATUS current Baker, Chan, Smith Expires January 2001 [Page 67] Internet Draft Differentiated Services MIB July 2000 DESCRIPTION "A collection of objects providing information specific to non- high speed (non-high speed interfaces transmit and receive at speeds less than or equal to 20,000,000 bits/second) packet- oriented network interfaces." ::= { diffServMIBGroups 8 } diffServMIBVHCCounterGroup OBJECT-GROUP OBJECTS { diffServCountActOctets, diffServCountActHCOctets, diffServCountActPkts, diffServCountActHCPkts, diffServCountActStatus, diffServAlgDropOctets, diffServAlgDropHCOctets, diffServAlgDropPkts, diffServAlgDropHCPkts } STATUS current DESCRIPTION "A collection of objects providing information specific to non- high speed (non-high speed interfaces transmit and receive at speeds less than or equal to 20,000,000 bits/second) packet- oriented network interfaces." ::= { diffServMIBGroups 9 } diffServMIBAlgDropGroup OBJECT-GROUP OBJECTS { diffServAlgDropType, diffServAlgDropNext, diffServAlgDropQMeasure, diffServAlgDropQThreshold, diffServAlgDropSpecific, diffServAlgDropStatus } STATUS current DESCRIPTION "The Algorithmic Drop Group contains the objects that describe algorithmic dropper operation and configuration." ::= { diffServMIBGroups 10 } diffServMIBRandomDropGroup OBJECT-GROUP OBJECTS { diffServRandomDropMinThreshBytes, diffServRandomDropMinThreshPkts, diffServRandomDropMaxThreshBytes, diffServRandomDropMaxThreshPkts, diffServRandomDropInvWeight, diffServRandomDropProbMax diffServRandomDropStatus } STATUS current DESCRIPTION "The Random Drop Group augments the Algorithmic Drop Group for Baker, Chan, Smith Expires January 2001 [Page 68] Internet Draft Differentiated Services MIB July 2000 random dropper operation and configuration." ::= { diffServMIBGroups 11 } diffServMIBQueueGroup OBJECT-GROUP OBJECTS { diffServQPriority, diffServQNext, diffServQMinRateAbs, diffServQMinRateRel, diffServQMaxRateAbs, diffServQMaxRateRel, diffServQStatus } STATUS current DESCRIPTION "The Queue Group contains the objects that describe an interface's queues." ::= { diffServMIBGroups 12 } diffServMIBSchedulerGroup OBJECT-GROUP OBJECTS { diffServSchedulerMethod, diffServSchedulerNext, diffServSchedulerStatus } STATUS current DESCRIPTION "The Scheduler Group contains the objects that describe packet schedulers on interfaces." ::= { diffServMIBGroups 13 } diffServMIBStaticGroup OBJECT-GROUP OBJECTS { diffServClassifierNextFree, diffServSixTupleClfrNextFree, diffServMeterNextFree, diffServActionNextFree, diffServAlgDropNextFree, diffServQNextFree, diffServSchedulerNextFree } STATUS current DESCRIPTION "The Static Group contains readable scalar objects used in creating unique identifiers for classifiers, meters, actions and queues. These are required whenever row creation operations on such tables are supported." ::= { diffServMIBGroups 14 } END Baker, Chan, Smith Expires January 2001 [Page 69] Internet Draft Differentiated Services MIB July 2000 7. Acknowledgments This MIB builds on all the work that has gone into the Informal Management Model for Diffserv routers. It has been developed with the active involvement of many people, but most notably Yoram Bernet, Steve Blake, Brian Carpenter, Dave Durham, Jeremy Greene, Dan Grossman, Roch Guerin, Scott Hahn, Keith McCloghrie, Bob Moore, Kathleen Nichols, Ping Pan, Nabil Seddigh and Bert Wijnen. 8. Security Considerations It is clear that this MIB is potentially useful for configuration, and anything that can be configured can be misconfigured, with potentially disastrous effect. At this writing, no security holes have been identified beyond those that SNMP Security is itself intended to address. These relate primarily to controlled access to sensitive information and the ability to configure a device - or which might result from operator error, which is beyond the scope of any security architecture. There are a number of management objects defined in this MIB that have a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. The use of SNMP Version 3 is recommended over prior versions for configuration control as its security model is improved. There are a number of managed objects in this MIB that may contain information that may be sensitive from a business perspective, in that they may represent a customer's service contract or the filters that the service provider chooses to apply to a customer's ingress or egress traffic. There are no objects which are sensitive in their own right, such as passwords or monetary amounts. It may be important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment. SNMPv1 by itself is not a secure environment. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB. Baker, Chan, Smith Expires January 2001 [Page 70] Internet Draft Differentiated Services MIB July 2000 It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User- based Security Model [12] and the View-based Access Control Model [15] is recommended. It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them. 9. References [1] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2571, Cabletron Systems, Inc., BMC Software, Inc., IBM T. J. Watson Research, April 1999 [2] Rose, M., and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", RFC 1155, STD 16, Performance Systems International, Hughes LAN Systems, May 1990 [3] Rose, M., and K. McCloghrie, "Concise MIB Definitions", RFC 1212, STD 16, Performance Systems International, Hughes LAN Systems, March 1991 [4] M. Rose, "A Convention for Defining Traps for use with the SNMP", RFC 1215, Performance Systems International, March 1991 [5] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", RFC 2578, STD 58, Cisco Systems, SNMPinfo, TU Braunschweig, SNMP Research, First Virtual Holdings, International Network Services, April 1999 [6] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Textual Conventions for SMIv2", RFC 2579, STD 58, Cisco Systems, SNMPinfo, TU Braunschweig, SNMP Research, First Virtual Holdings, International Network Services, April 1999 [7] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Conformance Statements for SMIv2", RFC 2580, STD 58, Cisco Systems, SNMPinfo, TU Braunschweig, SNMP Research, First Virtual Holdings, International Network Services, April 1999 [8] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network Management Protocol", RFC 1157, STD 15, SNMP Research, Performance Baker, Chan, Smith Expires January 2001 [Page 71] Internet Draft Differentiated Services MIB July 2000 Systems International, Performance Systems International, MIT Laboratory for Computer Science, May 1990. [9] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [10] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [11] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2572, SNMP Research, Inc., Cabletron Systems, Inc., BMC Software, Inc., IBM T. J. Watson Research, April 1999 [12] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2574, IBM T. J. Watson Research, April 1999 [13] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [14] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC 2573, SNMP Research, Inc., Secure Computing Corporation, Cisco Systems, April 1999 [15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2575, IBM T. J. Watson Research, BMC Software, Inc., Cisco Systems, Inc., April 1999 [16] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction to Version 3 of the Internet-standard Network Management Framework", RFC 2570, SNMP Research, Inc., TIS Labs at Network Associates, Inc., Ericsson, Cisco Systems, April 1999 [ACTQMGMT] V. Firoiu, M. Borden "A Study of Active Queue Management for Congestion Control", March 2000, In IEEE Infocom 2000, http://www.ieee-infocom.org/2000/papers/405.pdf Baker, Chan, Smith Expires January 2001 [Page 72] Internet Draft Differentiated Services MIB July 2000 [AF-PHB] J. Heinanen, F. Baker, W. Weiss, J. Wroclawski, "Assured Forwarding PHB Group.", RFC 2597, June 1999. [DSARCH] S. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, W. Weiss, "An Architecture for Differentiated Service", RFC 2475, December 1998. [DSFIELD] K. Nichols, S. Blake, F. Baker, D. Black, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers", RFC 2474, December 1998. [DSPIB] M. Fine, K. McCloghrie, J. Seligson, K. Chan, S. Hahn, A. Smith, "Differentiated Services Policy Information Base", Internet Draft , March 2000 [DSTERMS] D. Grossman, "New Terminology for Diffserv", Internet Draft , November 1999. [EF-PHB] V. Jacobson, K. Nichols, K. Poduri, "An Expedited Forwarding PHB." RFC 2598, June 1999. [IFMIB] K. McCloghrie, F. Kastenholz, "The Interfaces Group MIB using SMIv2", RFC 2233, November 1997. [INETADDRESS] Daniele, M., Haberman, B., Routhier, S., Schoenwaelder, J., "Textual Conventions for Internet Network Addresses.", RFC 2851, June 2000. [INTSERVMIB] F. Baker, J. Krawczyk, A. Sastry, "Integrated Services Management Information Base using SMIv2", RFC 2213, September 1997. [MODEL] Y. Bernet, S. Blake, A. Smith, D. Grossman, "An Informal Management Model for Diffserv Routers", Internet Draft , July 2000. [POLTERM] F. Reichmeyer, D. Grossman, J. Strassner, M. Condell, "A Common Terminology for Policy Management", Internet Draft , March 2000 [QUEUEMGMT] B. Braden et al., "Recommendations on Queue Management and Congestion Avoidance in the Internet", RFC 2309, April 1998. [RED93] "Random Early Detection", 1993. 10. Authors' Addresses Fred Baker Cisco Systems 519 Lado Drive Santa Barbara, California 93111 fred@cisco.com Kwok Ho Chan Nortel Networks 600 Technology Park Drive Billerica, MA 01821 khchan@nortelnetworks.com Andrew Smith ah_smith@pacbell.net Table of Contents 1 The SNMP Management Framework ................................... 2 2 Introduction .................................................... 3 2.1 Relationship to the Diffserv Informal Management Model ........ 3 2.2 Relationship to other MIBs and Policy Management .............. 3 2.3 MIB Overview .................................................. 4 3 Structure of this MIB ........................................... 5 3.1 Classifiers ................................................... 5 3.1.1 Classifier Table ............................................ 5 3.1.2 IP Six-Tuple Classifier Table ............................... 6 3.2 Meters ........................................................ 6 3.2.1 Meter Table ................................................. 6 3.2.2 Token-Bucket Meter Table .................................... 7 3.3 Actions ....................................................... 7 3.3.1 DSCP Mark Action Table ...................................... 7 3.3.2 Count Action Table .......................................... 8 Baker, Chan, Smith Expires January 2001 [Page 74] Internet Draft Differentiated Services MIB July 2000 3.3.3 Absolute Drop Action ........................................ 8 3.4 Queueing Elements ............................................. 8 3.4.1 Algorithmic Dropper Table ................................... 8 3.4.2 Random Dropper Table ........................................ 9 3.4.3 Queues and Schedulers ....................................... 11 3.4.4 Example of Algorithmic Droppers, Queues and Schedulers ...... 12 4 Conventions used in this MIB .................................... 13 4.1 The use of RowPointer ......................................... 13 4.2 Conceptual row creation and deletion .......................... 14 5 Editorial information ........................................... 15 5.1 Open Issues resolved in previous drafts ....................... 15 5.2 Open Issues resolved in this draft ............................ 17 5.3 Still Open Issues ............................................. 18 6 MIB Definition .................................................. 19 7 Acknowledgments ................................................. 70 8 Security Considerations ......................................... 70 9 References ...................................................... 71 10 Authors' Addresses ............................................. 74 Baker, Chan, Smith Expires January 2001 [Page 75] Internet Draft Differentiated Services MIB July 2000 11. 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