MPLS Working Group E. Bellagamba, Ed. Internet-Draft G. Mirsky, Ed. Intended status: Standards Track Ericsson Expires: April 3, 2015 L. Andersson Huawei P. Skoldstrom, Ed. Acreo AB D. Ward Cisco J. Drake Juniper September 30, 2014 Configuration of Pro-Active Operations, Administration, and Maintenance (OAM) Functions for MPLS-based Transport Networks using LSP Ping draft-ietf-mpls-lsp-ping-mpls-tp-oam-conf-07 Abstract This specification describes the configuration of pro-active MPLS-TP Operations, Administration, and Maintenance (OAM) Functions for a given LSP using a set of TLVs that are carried by the LSP-Ping protocol. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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." This Internet-Draft will expire on April 3, 2015. Copyright Notice Copyright (c) 2014 IETF Trust and the persons identified as the document authors. All rights reserved. Bellagamba, et al. Expires April 3, 2015 [Page 1] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Conventions used in this document . . . . . . . . . . . . 4 1.1.1. Terminology . . . . . . . . . . . . . . . . . . . . . 4 1.1.2. Requirements Language . . . . . . . . . . . . . . . . 4 2. Theory of Operations . . . . . . . . . . . . . . . . . . . . 4 2.1. MPLS OAM Configuration Operation Overview . . . . . . . . 4 2.1.1. Configuration of BFD sessions . . . . . . . . . . . . 5 2.1.2. Configuration of Performance Monitoring . . . . . . . 6 2.1.3. Configuration of Fault Management Signals . . . . . . 6 2.2. MPLS OAM Functions TLV . . . . . . . . . . . . . . . . . 6 2.2.1. BFD Configuration sub-TLV . . . . . . . . . . . . . . 8 2.2.2. Local Discriminator sub-TLV . . . . . . . . . . . . . 10 2.2.3. Negotiation Timer Parameters sub-TLV . . . . . . . . 10 2.2.4. BFD Authentication sub-TLV . . . . . . . . . . . . . 12 2.2.5. Performance Measurement sub-TLV . . . . . . . . . . . 12 2.2.6. PM Loss Measurement sub-TLV . . . . . . . . . . . . . 14 2.2.7. PM Delay Measurement sub-TLV . . . . . . . . . . . . 15 2.2.8. Fault Managemet Signal sub-TLV . . . . . . . . . . . 16 2.2.9. Source MEP-ID sub-TLV . . . . . . . . . . . . . . . . 17 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18 3.1. TLV and sub-TLV Allocation . . . . . . . . . . . . . . . 18 3.2. OAM configuration errors . . . . . . . . . . . . . . . . 18 4. Security Considerations . . . . . . . . . . . . . . . . . . . 19 5. References . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.1. Normative References . . . . . . . . . . . . . . . . . . 19 5.2. Informative References . . . . . . . . . . . . . . . . . 20 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21 1. Introduction This document describes the configuration of pro-active MPLS-TP Operations, Administration, and Maintenance (OAM) Functions for a given LSP using TLVs carried in LSP-Ping [RFC4379]. In particular it specifies the mechanisms necessary to establish MPLS-TP OAM entities at the maintenance points for monitoring and performing measurements on an LSP, as well as defining information elements and procedures to Bellagamba, et al. Expires April 3, 2015 [Page 2] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 configure pro-active MPLS-TP OAM functions running between LERs. Initialization and control of on-demand MPLS-TP OAM functions are expected to be carried out by directly accessing network nodes via a management interface; hence configuration and control of on-demand OAM functions are out-of-scope for this document. The Transport Profile of MPLS must, by definition [RFC5654], be capable of operating without a control plane. Therefore there are several options for configuring MPLS-TP OAM, without a control plane by either using an NMS or LSP Ping, or with a control plane using signaling protocols RSVP-TE [RFC3209] and/or T-LDP [RFC5036]. MPLS Transport Profile (MPLS-TP) describes a profile of MPLS that enables operational models typical in transport networks, while providing additional OAM, survivability and other maintenance functions not currently supported by MPLS. [RFC5860] defines the requirements for the OAM functionality of MPLS-TP. Pro-active MPLS-TP OAM is performed by set of protocols, Bi- directional Forwarding Detection (BFD) [RFC6428] for Continuity Check/Connectivity Verification, the delay measurement protocol (DM) [RFC6374], [RFC6375] for delay and delay variation (jitter) measurements, and the loss measurement (LM) protocol [RFC6374], [RFC6375] for packet loss and throughput measurements. Additionally there is a number of Fault Management Signals that can be configured. BFD is a protocol that provides low-overhead, fast detection of failures in the path between two forwarding engines, including the interfaces, data link(s), and, to the extent possible, the forwarding engines themselves. BFD can be used to detect the continuity and mis-connection defects of MPLS-TP point-to-point and might also be extended to support point-to-multipoint label switched paths (LSPs). The delay and loss measurements protocols [RFC6374], [RFC6375] use a simple query/response model for performing both uni- and bi- directional measurements that allow the originating node to measure packet loss and delay in forward or forward and reverse directions. By timestamping and/or writing current packet counters to the measurement packets at four times (Tx and Rx in both directions) current delays and packet losses can be calculated. By performing successive delay measurements the delay and/or inter-packet delay variation (jitter) can be calculated. Current throughput can be calculated from the packet loss measurements by dividing the number of packets sent/received with the time it took to perform the measurement, given by the timestamp in LM header. Combined with a packet generator the throughput measurement can be used to measure the maximum capacity of a particular LSP. It should be noted that here we are not configuring on-demand throughput estimates based on Bellagamba, et al. Expires April 3, 2015 [Page 3] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 saturating the connection as defined in [RFC6371]. Rather, we only enable the estimation of the current throughput based on loss measurements. 1.1. Conventions used in this document 1.1.1. Terminology BFD - Bidirectional Forwarding Detection DM - Delay Measurement FMS - Fault Management Signal G-ACh - Generic Associated Channel LSP - Label Switched Path LM - Loss Measurement MEP - Maintanence Entity Group End Point MPLS - Multi-Protocol Label Switching MPLS-TP - MPLS Transport Profile PM - Performance Measurement 1.1.2. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 2. Theory of Operations 2.1. MPLS OAM Configuration Operation Overview The MPLS-TP OAM tool set is described in the [RFC6669]. LSP Ping, or alternatively RSVP-TE [RSVP-TE-CONF], can be used to simply enable the different OAM functions, by setting the corresponding flags in the MPLS OAM Functions TLV, Section 2.2. For a more detailed configuration one may include sub-TLVs for the different OAM functions in order to specify various parameters in detail. Bellagamba, et al. Expires April 3, 2015 [Page 4] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 Typically intermediate nodes should not process or modify any of the OAM configuration TLVs but simply forward them to the end-node. There is one exception to this and that is if the FMS sub-TLV, Section 2.2.8, is present. This sub-TLV has to be examined even by intermediate nodes. The sub-TLV MAY be present if a flag is set in the MPLS OAM Functions TLV. 2.1.1. Configuration of BFD sessions For this specification, BFD MUST be run in either one of the two modes: - Asynchronous mode, where both sides should be in active mode - Unidirectional mode In the simplest scenario LSP Ping [RFC5884], or alternatively RSVP-TE [RSVP-TE CONF], is used only to bootstrap a BFD session for an LSP, without any timer negotiation. Timer negotiation can be performed either in subsequent BFD control messages (in this case the operation is similar to LSP Ping based bootstrapping described in [RFC5884]) or directly in the LSP-Ping configuration messages. When BFD Control packets are transported in the ACH encapsulation they are not protected by any end-to-end checksum, only lower-layers are providing error detection/correction. A single bit error, e.g. a flipped bit in the BFD State field could cause the receiving end to wrongly conclude that the link is down and in turn trigger protection switching. To prevent this from happening the BFD Configuration sub- TLV, Section 2.2.1, has an Integrity flag that when set enables BFD Authentication using Keyed SHA1 with an empty key (all 0s) [RFC5880]. This would make every BFD Control packet carry an SHA1 hash of itself that can be used to detect errors. If BFD Authentication using a pre-shared key/password is desired (i.e. authentication and not only error detection) the BFD Authentication sub-TLV, Section 2.2.4, MUST be included in the BFD Configuration sub-TLV. The BFD Authentication sub-TLV is used to specify which authentication method that should be used and which pre-shared key/ password that should be used for this particular session. How the key exchange is performed is out of scope of this document. Bellagamba, et al. Expires April 3, 2015 [Page 5] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 2.1.2. Configuration of Performance Monitoring It is possible to configure Performance Monitoring functionalities such as Loss, Delay, Delay/Interpacket Delay variation (jitter), and Throughput as described in [RFC6374]. When configuring Performance monitoring functionalities it is possible to choose either the default configuration, by only setting the respective flags in the MPLS OAM functions TLV, or a customized configuration. To customize the configuration one would set the respective flags in the including the respective Loss and/or Delay sub-TLVs). By setting the PM Loss flag in the MPLS OAM Functions TLV and including the PM Loss sub-TLV, Section 2.2.6, one can configure the measurement interval and loss threshold values for triggering protection. Delay measurements are configured by setting PM Delay flag in the MPLS OAM Functions TLV and including the PM Delay sub-TLV, Section 2.2.7, one can configure the measurement interval and the delay threshold values for triggering protection. 2.1.3. Configuration of Fault Management Signals To configure Fault Management Signals (FMS) and their refresh time the FMS flag in the MPLS OAM Functions TLV MUST be set and the FMS sub-TLV MUST be included. When configuring FMS, an implementation can enable the default configuration by setting the FMS flag in the OAM Function Flags sub-TLV. If an implementation wishes to modify the default configuration it includes a MPLS OAM FMS sub-TLV. If an intermediate point is meant to originate fault management signal messages this means that such an intermediate point is associated to a Server MEP through a co-located MPLS-TP client/server adaptation function. Such a Server MEP needs to be configured by its own LSP-ping session or, alternatively, via an NMS or RSVP-TE. However, by setting the S flag Section 2.2.8 in the FMS sub-TLV a client LSP can indicate that it would like an association to be created to the server MEP(s) on any intermediate nodes. 2.2. MPLS OAM Functions TLV The MPLS OAM Functions TLV presented in Figure 1 is carried as a TLV of the LSP Echo request/response messages [RFC4379]. Bellagamba, et al. Expires April 3, 2015 [Page 6] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MPLS OAM Func. Type (TBD1) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |C|V|L|D|F| Must be zero | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ sub-TLVs ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: MPLS OAM Functions TLV format The MPLS OAM Functions TLV contains a number of flags indicating which OAM functions should be activated as well as OAM function specific sub-TLVs with configuration parameters for the particular function. Type: indicates the MPLS OAM Functions TLV Section 3. Length: the length of the MPLS OAM Function Flags field including the total length of the sub-TLVs in octets. MPLS OAM Function Flags: a bitmap numbered from left to right as shown in the figure. These flags are defined in this document as presented in Table 1: +------------+--------------------+---------------------------------+ | Bit | MPLS OAM Function | Description | | Position | Flag | | +------------+--------------------+---------------------------------+ | 0 | C | Continuity Check (CC) | | 1 | V | Connectivity Verification (CV) | | 2 | F | Fault Management Signal (FMS) | | 3 | L | Performance Measurement/Loss | | | | (PM/Loss) | | 4 | D | Performance Measurement/Delay | | | | (PM/Delay) | | 5 | T | Throughput Measurement) | | 6-31 | | Reserved | +------------+--------------------+---------------------------------+ Table 1: MPLS OAM TLV Flags Sub-TLVs corresponding to the different flags are as follows: Bellagamba, et al. Expires April 3, 2015 [Page 7] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 - BFD Configuration sub-TLV, which MUST be included if the CC and/ or the CV OAM Function flag is set. This sub-TLV MUST carry a "BFD Local Discriminator sub-TLV" and a "Timer Negotiation Parameters sub-TLV" if the N flag is cleared. The "Source MEP-ID sub-TLV" MUST also be included. If the I flag is set, the "BFD Authentication sub-TLV" may be included. - PM Loss sub-TLV within the "Performance Monitoring sub-TLV", which MAY be included if the PM/Loss OAM Function flag is set. If the "PM Loss sub-TLV" is not included, default configuration values are used. Such sub-TLV MAY also be included in case the Throughput function flag is set and there is the need to specify measurement interval different from the default ones. In fact the throughput measurement make use of the same tool as the loss measurement, hence the same TLV is used. - PM Delay sub-TLV within the "Performance Monitoring sub-TLV", which MAY be included if the PM/Delay OAM Function flag is set. If the "PM Delay sub-TLV" is not included, default configuration values are used. - FMS sub-TLV, which MAY be included if the FMS OAM Function flag is set. If the "FMS sub-TLV" is not included, default configuration values are used. 2.2.1. BFD Configuration sub-TLV The BFD Configuration sub-TLV, depicted Figure 2, is defined for BFD OAM specific configuration parameters. The "BFD Configuration sub- TLV" is carried as a sub-TLV of the "OAM Functions TLV". This TLV accommodates generic BFD OAM information and carries sub- TLVs. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BFD Conf. sub-Type (100) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Vers.| PHB |N|S|I|G|U|B| Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 2: BFD Configuration sub-TLV format Sub-type: indicates a new sub-type, the BFD Configuration sub-TLV (IANA to define, suggested value 100). Bellagamba, et al. Expires April 3, 2015 [Page 8] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 Length: indicates the length of the TLV including sub-TLVs but excluding the Type and Length field, in octets. Version: identifies the BFD protocol version. If a node does not support a specific BFD version an error must be generated: "OAM Problem/Unsupported OAM Version". PHB: Identifies the Per-Hop Behavior (PHB) to be used for periodic continuity monitoring messages. BFD Negotiation (N): If set timer negotiation/re-negotiation via BFD Control Messages is enabled, when cleared it is disabled. Symmetric session (S): If set the BFD session MUST use symmetric timing values. Integrity (I): If set BFD Authentication MUST be enabled. If the BFD Configuration sub-TLV does not include a BFD Authentication sub-TLV the authentication MUST use Keyed SHA1 with an empty pre-shared key (all 0s). Encapsulation Capability (G): if set, it shows the capability of encapsulating BFD messages into G-ACh channel. If both the G bit and U bit are set, configuration gives precedence to the G bit. Encapsulation Capability (U): if set, it shows the capability of encapsulating BFD messages into IP/UDP packets. If both the G bit and U bit are set, configuration gives precedence to the G bit. Bidirectional (B): if set, it configures BFD in the Bidirectional mode. If it is not set it configures BFD in unidirectional mode. In the second case, the source node does not expect any Discriminator values back from the destination node. Reserved: Reserved for future specification and set to 0 on transmission and ignored when received. The BFD Configuration sub-TLV MUST include the following sub-TLVs in the LSP Echo request message: - Local Discriminator sub-TLV; - Negotiation Timer Parameters sub-TLV if the N flag is cleared. The BFD Configuration sub-TLV MUST include the following sub-TLVs in the LSP Echo reply message: - Local Discriminator sub-TLV; Bellagamba, et al. Expires April 3, 2015 [Page 9] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 - Negotiation Timer Parameters sub-TLV if: - the N and S flags are cleared, or if: - the N flag is cleared and the S flag is set, and the Negotiation Timer Parameters sub-TLV received by the egress contains unsupported values. In this case an updated Negotiation Timer Parameters sub-TLV, containing values supported by the egress node, is returned to the ingress. 2.2.2. Local Discriminator sub-TLV The Local Discriminator sub-TLV is carried as a sub-TLV of the "BFD Configuration sub-TLV" and is depicted in Figure 3. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Lcl. Discr. sub-Type (101) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local Discriminator | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 3: Local Discriminator sub-TLV format Type: indicates a new type, the "Local Discriminator sub-TLV" (IANA to define, suggested value 101). Length: indicates the sub-TLV length in octets, excluding the sub- type and Length field. (4) Local Discriminator: A unique, nonzero discriminator value generated by the transmitting system and referring to itself, used to demultiplex multiple BFD sessions between the same pair of systems. 2.2.3. Negotiation Timer Parameters sub-TLV The Negotiation Timer Parameters sub-TLV is carried as a sub-TLV of the BFD Configuration sub-TLV and is depicted in Figure 4. Bellagamba, et al. Expires April 3, 2015 [Page 10] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Nego. Timer sub-type (102) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Acceptable Min. Asynchronous TX interval | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Acceptable Min. Asynchronous RX interval | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Required Echo TX Interval | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 4: Negotiation Timer Parameters sub-TLV format Sub-type: indicates a new sub-type, the Negotiation Timer Parameters sub-TLV (IANA to define, suggested value 102). Length: indicates the length of the parameters in octets (12). Acceptable Min. Asynchronous TX interval: in case of S (symmetric) flag set in the BFD Configuration sub-TLV, defined in Section 2.2.1, it expresses the desired time interval (in microseconds) at which the ingress LER intends to both transmit and receive BFD periodic control packets. If the receiving edge LSR can not support such value, it SHOULD reply with an interval greater than the one proposed. In case of S (symmetric) flag cleared in the BFD Configuration sub- TLV, this field expresses the desired time interval (in microseconds) at which a edge LSR intends to transmit BFD periodic control packets in its transmitting direction. Acceptable Min. Asynchronous RX interval: in case of S (symmetric) flag set in the BFD Configuration sub-TLV, Figure 2, this field MUST be equal to Acceptable Min. Asynchronous TX interval and has no additional meaning respect to the one described for "Acceptable Min. Asynchronous TX interval". In case of S (symmetric) flag cleared in the BFD Configuration sub- TLV, it expresses the minimum time interval (in microseconds) at which edge LSRs can receive BFD periodic control packets. In case this value is greater than the value of Acceptable Min. Asynchronous TX interval received from the other edge LSR, such edge LSR MUST adopt the interval expressed in this Acceptable Min. Asynchronous RX interval. Required Echo TX Interval: the minimum interval (in microseconds) between received BFD Echo packets that this system is capable of supporting, less any jitter applied by the sender as described in Bellagamba, et al. Expires April 3, 2015 [Page 11] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 [RFC5880] sect. 6.8.9. This value is also an indication for the receiving system of the minimum interval between transmitted BFD Echo packets. If this value is zero, the transmitting system does not support the receipt of BFD Echo packets. If the receiving system can not support this value the "Unsupported BFD TX Echo rate interval" error MUST be generated. By default the value is set to 0. 2.2.4. BFD Authentication sub-TLV The "BFD Authentication sub-TLV" is carried as a sub-TLV of the "BFD Configuration sub-TLV" and is depicted in Figure 5. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BFD Auth. sub-type (103) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Auth Type | Auth Key ID | Reserved (0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 5: BFD Authentication sub-TLV format Sub-type: indicates a new type, the BFD Authentication sub-TLV (IANA to define, suggested value 103). Length: indicates the TLV total length in octets, exluding the Type and Length fields. (4) Auth Type: indicates which type of authentication to use. The same values as are defined in section 4.1 of [RFC5880] are used. Auth Key ID: indicates which authentication key or password (depending on Auth Type) should be used. How the key exchange is performed is out of scope of this document. Reserved: Reserved for future specification and set to 0 on transmission and ignored when received. 2.2.5. Performance Measurement sub-TLV If the MPLS OAM Functions TLV has either the L (Loss), D (Delay) or T (Throughput) flag set, the Performance Measurement sub-TLV MUST be present. The Performance Measurement sub-TLV provides the configuration information mentioned in Section 7 of [RFC6374]. It includes support for the configuration of quality thresholds and, as described in [RFC6374], "the crossing of which will trigger warnings or alarms, Bellagamba, et al. Expires April 3, 2015 [Page 12] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 and result reporting and exception notification will be integrated into the system-wide network management and reporting framework." In case the values need to be different than the default ones the Performance Measurement sub-TLV MAY include the following sub-TLVs: - PM Loss sub-TLV if the L flag is set in the MPLS OAM Functions TLV; - PM Delay sub-TLV if the D flag is set in the MPLS OAM Functions TLV. The Performance Measurement sub-TLV depicted in Figure 6 is carried as a sub-TLV of the MPLS OAM Functions TLV. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Perf Monitoring Type (200) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |D|L|J|Y|K|C| Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 6: Performance Measurement sub-TLV format Sub-type: indicates a new sub-type, the Performance Management sub- TLV" (IANA to define, suggested value 200). Length: indicates the TLV length in octets, exluding the Type and Length fields. Configuration Flags, for the specific function description please refer to [RFC6374]: - D: Delay inferred/direct (0=INFERRED, 1=DIRECT) - L: Loss inferred/direct (0=INFERRED, 1=DIRECT) - J: Delay variation/jitter (1=ACTIVE, 0=NOT ACTIVE) - Y: Dyadic (1=ACTIVE, 0=NOT ACTIVE) - K: Loopback (1=ACTIVE, 0=NOT ACTIVE) - C: Combined (1=ACTIVE, 0=NOT ACTIVE) Reserved: Reserved for future specification and set to 0 on transmission and ignored when received. Bellagamba, et al. Expires April 3, 2015 [Page 13] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 2.2.6. PM Loss Measurement sub-TLV The PM Loss Measurement sub-TLV depicted in Figure 7 is carried as a sub-TLV of the Performance Measurement sub-TLV. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PM Loss sub-type (201) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | OTF |T|B| Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Measurement Interval | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Test Interval | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Loss Threshold | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 7: PM Loss Measurement sub-TLV format Sub-type: indicates a new sub-type, the PM Loss Measurement sub-TLV (IANA to define, suggested value 201). Length: indicates the length of the parameters in octets (16). OTF: Origin Timestamp Format of the Origin Timestamp field described in [RFC6374]. By default it is set to IEEE 1588 version 1. Configuration Flags, please refer to [RFC6374] for further details: - T: Traffic-class-specific measurement indicator. Set to 1 when the measurement operation is scoped to packets of a particular traffic class (DSCP value), and 0 otherwise. When set to 1, the DS field of the message indicates the measured traffic class. By default it is set to 1. - B: Octet (byte) count. When set to 1, indicates that the Counter 1-4 fields represent octet counts. When set to 0, indicates that the Counter 1-4 fields represent packet counts. By default it is set to 0. Reserved: Reserved for future specification and set to 0 on transmission and ignored when received. Measurement Interval: the time interval (in milliseconds) at which Loss Measurement query messages MUST be sent on both directions. If the edge LSR receiving the Path message can not support such value, Bellagamba, et al. Expires April 3, 2015 [Page 14] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 it SHOULD reply with a higher interval. By default it is set to (100) as per [RFC6375]. Test Interval: test messages interval in milliseconds as described in [RFC6374]. By default it is set to (10) as per [RFC6375]. Loss Threshold: the threshold value of measured lost packets per measurement over which action(s) SHOULD be triggered. 2.2.7. PM Delay Measurement sub-TLV The PM Delay Measurement sub-TLV" depicted in Figure 8 is carried as a sub-TLV of the Performance Monitoring sub-TLV. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PM Delay Type (202) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | OTF |T|B| Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Measurement Interval | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Test Interval | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Delay Threshold | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 8: PM Delay Measurement sub-TLV format Sub-type: indicates a new sub-type, the PM Delay Measurement sub-TLV" (IANA to define, suggested value 202). Length: indicates the length of the parameters in octets (16). OTF: Origin Timestamp Format of the Origin Timestamp field described in [RFC6374]. By default it is set to IEEE 1588 version 1. Configuration Flags, please refer to [RFC6374] for further details: - T: Traffic-class-specific measurement indicator. Set to 1 when the measurement operation is scoped to packets of a particular traffic class (DSCP value), and 0 otherwise. When set to 1, the DS field of the message indicates the measured traffic class. By default it is set to 1. - B: Octet (byte) count. When set to 1, indicates that the Counter 1-4 fields represent octet counts. When set to 0, Bellagamba, et al. Expires April 3, 2015 [Page 15] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 indicates that the Counter 1-4 fields represent packet counts. By default it is set to 0. Reserved: Reserved for future specification and set to 0 on transmission and ignored when received. Measurement Interval: the time interval (in milliseconds) at which Delay Measurement query messages MUST be sent on both directions. If the edge LSR receiving the Path message can not support such value, it can reply with a higher interval. By default it is set to (1000) as per [RFC6375]. Test Interval: test messages interval (in milliseconds) as described in [RFC6374]. By default it is set to (10) as per [RFC6375]. Delay Threshold: the threshold value of measured two-way delay (in milliseconds) over which action(s) SHOULD be triggered. 2.2.8. Fault Managemet Signal sub-TLV The FMS sub-TLV depicted in Figure 9 is carried as a sub-TLV of the MPLS OAM Configuration sub-TLV. When both working and protection paths are configured, both LSPs SHOULD be configured with identical settings of the E flag, T flag, and the refresh timer. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | FMS sub-type (300) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |E|S|T| Reserved (set to all 0s)| Refresh Timer | PHB | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 9: Fault Management Signal sub-TLV format Sub-type: indicates a new sub-type, the FMS sub-TLV (IANA to define, suggested value 300). Length: indicates the length of the parameters in octets (4). FMS Signal Flags are used to enable the FMS signals at end point MEPs and the Server MEPs of the links over which the LSP is forwarded. In this document only the S flag pertains to Server MEPs. The following flags are defined: Bellagamba, et al. Expires April 3, 2015 [Page 16] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 - E: Enable Alarm Indication Signal (AIS) and Lock Report (LKR) signalling as described in [RFC6427]. Default value is 1 (enabled). - S: Indicate to a server MEP that its should transmit AIS and LKR signals on the client LSP. Default value is 0 (disabled). - T: Set timer value, enabled the configuration of a specific timer value. Default value is 0 (disabled). - Remaining bits: Reserved for future specification and set to 0. Refresh Timer: indicates the refresh timer of fault indication messages, in seconds. The value MUST be between 1 to 20 seconds as specified for the Refresh Timer field in [RFC6427]. If the edge LSR receiving the Path message can not support the value it SHOULD reply with a higher timer value. PHB: identifies the per-hop behavior of packets with fault management information. 2.2.9. Source MEP-ID sub-TLV The Source MEP-ID sub-TLV depicted in Figure 10 is carried as a sub- TLV of the MPLS OAM Functions TLV. Note that support of ITU IDs is out-of-scope. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source MEP-ID sub-type (400) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Node ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Tunnel ID | LSP ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 10: Source MEP-ID sub-TLV format Sub-type: indicates a new sub-type, the Source MEP-ID sub-TLV (IANA to define, suggested value 400). Length: indicates the length of the TLV in octets, excluding the Type and Length fields. (8) Source Node ID: 32-bit node identifier as defined in [RFC6370]. Bellagamba, et al. Expires April 3, 2015 [Page 17] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 Tunnel ID: a 16-bit unsigned integer unique to the node as defined in [RFC6370]. LSP ID: a 16-bit unsigned integer unique within the Tunnel_ID as defined in [RFC6370]. 3. IANA Considerations 3.1. TLV and sub-TLV Allocation Note: The IANA considerations in this document is written according to the allocation policies specified in RFC4379. However there is a draft that suggest changes to these allocation policies, draft-pac- mpls-lsp-ping-tlvs-and-sub-tlvs-registry if the working group accept the new allocation specied in that draft the allocations made this draft, this IANA Considerations section in this document will be re- written. IANA maintians a registry Multi-Protocol Label Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters registry, and within that registry a sub-registry TLVs and sub-TLVs. IANA is requested a new TLV from the standards action range (0-16383) and sub-TLVs as follows from this sub-registry. +------+----------+---------------------------------+---------------+ | Type | Sub-type | Value Field | Reference | +------+----------+---------------------------------+---------------+ | TBD1 | | MPLS OAM Functions | This document | | | 100 | BFD Configuration | This document | | | 101 | BFD Local Discriminator | This document | | | 102 | BFD Negotiation Timer | This document | | | | Parameters | | | | 103 | BFD Authentication | This document | | | 200 | Performance Measurement | This document | | | 201 | PM Loss Measurement | This document | | | 202 | PM Delay Measurement | This document | | | 203 | Fault Management Signal | This document | | | 204 | Source MEP-ID | This document | +------+----------+---------------------------------+---------------+ Table 2: IANA TLV Type Allocation 3.2. OAM configuration errors IANA maintians a registry "Multi-Protocol Label Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters" registry, and within that registry a sub-registry "Return Codes". Bellagamba, et al. Expires April 3, 2015 [Page 18] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 IANA is requested to assign new Return Codes from the Standards Action range (0-191) as follows: +-------+-------------------------------------------+---------------+ | Value | Meaning | Reference | +-------+-------------------------------------------+---------------+ | TBD2 | MPLS OAM Unsupported Functionality | This document | | TBD3 | OAM Problem/Unsupported TX rate interval | This document | | TBD4 | OAM Problem/Unsupported RX rate interval | This document | | TBD5 | OAM Problem/Unsupported Authentication | This document | | | Type | | | TBD6 | OAM Problem mismatch of Authentication | This document | | | Key ID | | +-------+-------------------------------------------+---------------+ Table 3: IANA Return Codes Allocation 4. Security Considerations The signaling of OAM related parameters and the automatic establishment of OAM entities introduces additional security considerations to those discussed in [RFC3473]. In particular, a network element could be overloaded if an attacker were to request high frequency liveliness monitoring of a large number of LSPs, targeting a single network element. 5. References 5.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3473] Berger, L., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, January 2003. [RFC4379] Kompella, K. and G. Swallow, "Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures", RFC 4379, February 2006. [RFC5654] Niven-Jenkins, B., Brungard, D., Betts, M., Sprecher, N., and S. Ueno, "Requirements of an MPLS Transport Profile", RFC 5654, September 2009. [RFC5860] Vigoureux, M., Ward, D., and M. Betts, "Requirements for Operations, Administration, and Maintenance (OAM) in MPLS Transport Networks", RFC 5860, May 2010. Bellagamba, et al. Expires April 3, 2015 [Page 19] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 [RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD)", RFC 5880, June 2010. [RFC5884] Aggarwal, R., Kompella, K., Nadeau, T., and G. Swallow, "Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)", RFC 5884, June 2010. [RFC6370] Bocci, M., Swallow, G., and E. Gray, "MPLS Transport Profile (MPLS-TP) Identifiers", RFC 6370, September 2011. [RFC6374] Frost, D. and S. Bryant, "Packet Loss and Delay Measurement for MPLS Networks", RFC 6374, September 2011. [RFC6427] Swallow, G., Fulignoli, A., Vigoureux, M., Boutros, S., and D. Ward, "MPLS Fault Management Operations, Administration, and Maintenance (OAM)", RFC 6427, November 2011. [RFC6428] Allan, D., Swallow Ed. , G., and J. Drake Ed. , "Proactive Connectivity Verification, Continuity Check, and Remote Defect Indication for the MPLS Transport Profile", RFC 6428, November 2011. 5.2. Informative References [RFC3209] Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V., and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP Tunnels", RFC 3209, December 2001. [RFC5036] Andersson, L., Minei, I., and B. Thomas, "LDP Specification", RFC 5036, October 2007. [RFC6371] Busi, I. and D. Allan, "Operations, Administration, and Maintenance Framework for MPLS-Based Transport Networks", RFC 6371, September 2011. [RFC6375] Frost, D. and S. Bryant, "A Packet Loss and Delay Measurement Profile for MPLS-Based Transport Networks", RFC 6375, September 2011. [RFC6669] Sprecher, N. and L. Fang, "An Overview of the Operations, Administration, and Maintenance (OAM) Toolset for MPLS- Based Transport Networks", RFC 6669, July 2012. Bellagamba, et al. Expires April 3, 2015 [Page 20] Internet-Draft Extensions for MPLS-TP OAM Conf September 2014 [RSVP-TE-CONF] Bellagamba, E., Andersson, L., Ward, D., and P. Skoldstrom, "Configuration of pro-active MPLS-TP Operations, Administration, and Maintenance (OAM) Functions Using RSVP-TE", 2012, . Authors' Addresses Elisa Bellagamba (editor) Ericsson Email: elisa.bellagamba@ericsson.com Gregory Mirsky (editor) Ericsson Email: Gregory.Mirsky@ericsson.com Loa Andersson Huawei Email: loa@mail01.huawei.com Pontus Skoldstrom (editor) Acreo AB Electrum 236 Kista 164 40 Sweden Phone: +46 8 6327731 Email: pontus.skoldstrom@acreo.se Dave Ward Cisco Email: dward@cisco.com John Drake Juniper Email: jdrake@juniper.net Bellagamba, et al. Expires April 3, 2015 [Page 21]