Networking Working Group JP. Vasseur Internet-Draft Cisco Systems, Inc Intended status: Standards Track October 10, 2006 Expires: April 13, 2007 A set of monitoring tools for Path Computation Element based architecture draft-vasseur-pce-monitoring-00.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. 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 Internet-Draft will expire on April 13, 2007. Copyright Notice Copyright (C) The Internet Society (2006). Abstract A Path Computation Element (PCE) based architecture has been specified for the computation of constrained shortest Traffic Engineering (TE) Label Switched Paths (LSPs) in Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks in the context of single or multiple across multiple domains (where a domain is referred to as a collection of network elements within a common sphere of address management or path computational responsibility Vasseur Expires April 13, 2007 [Page 1] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 such as IGP areas and Autonomous Systems). In such PCE-based environment it is thus critical to monitor the state of the path computation chain and potentially gather various performance metrics with regards to the set of involved PCE(s) that can used for performance monitoring and troubleshooting purposes so as to identify a potential bottleneck in the path computation chain. This document specifies procedures and extensions to the Path Computation Element Protocol (PCEP) in order to gather such information. 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]. Table of Contents 1. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Path Computation Monitoring messages . . . . . . . . . . . . . 4 3.1. Path Computation Monitoring Request message (PCMonReq) . . 5 3.2. Path Monitoring Reply message (PCMonRep) . . . . . . . . . 6 4. Path Computation Monitoring Objects . . . . . . . . . . . . . 7 4.1. MONITORING Object . . . . . . . . . . . . . . . . . . . . 7 4.2. PCE-ID Object . . . . . . . . . . . . . . . . . . . . . . 8 4.3. PROC-TIME Object . . . . . . . . . . . . . . . . . . . . . 9 4.4. TIMESTAMP Object . . . . . . . . . . . . . . . . . . . . . 11 5. Multi-destination monitoring . . . . . . . . . . . . . . . . . 11 6. Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7. Element of procedure . . . . . . . . . . . . . . . . . . . . . 12 8. Manageability Considerations . . . . . . . . . . . . . . . . . 12 9. To be considered in a further revision of this document . . . 12 10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13 11. Security Considerations . . . . . . . . . . . . . . . . . . . 13 12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13 13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14 13.1. Normative References . . . . . . . . . . . . . . . . . . . 14 13.2. Informative References . . . . . . . . . . . . . . . . . . 14 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 14 Intellectual Property and Copyright Statements . . . . . . . . . . 15 Vasseur Expires April 13, 2007 [Page 2] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 1. Terminology ABR: routers used to connect two IGP areas (areas in OSPF or levels in IS-IS). ASBR: routers used to connect together ASs of a different or the same Service Provider via one or more Inter-AS links. Boundary Node (BN): a boundary node is either an ABR in the context of inter- area TE or an ASBR in the context of inter-AS TE. Entry BN of domain(n): a BN connecting domain(n-1) to domain(n). Exit BN of domain(n): a BN connecting domain(n) to domain(n+1). Inter-AS TE LSP: A TE LSP that crosses an AS boundary. Inter-area TE LSP: A TE LSP that crosses an IGP area boundary. LSR: Label Switching Router. LSP: Label Switched Path. PCE (Path Computation Element): an entity (component, application or network node) that is capable of computing a network path or route based on a network graph and applying computational constraints. PCE(i) is a PCE with the scope of domain(i). TED: Traffic Engineering Database. 2. Introduction The Path Computation Element (PCE) based architecture has been specified in [RFC4655] for the computation of constrained shortest Traffic Engineering (TE) Label Switched Paths (LSPs) in Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks in the context of single or multiple across multiple domains (where a domain is referred to as a collection of network elements within a common sphere of address management or path computational responsibility such as IGP areas and Autonomous Systems). In such PCE-based environment it is thus critical to monitor the state of the path computation chain and potentially gather various performance metrics with regards to the set of involved PCE(s) that can used for performance monitoring and troubleshooting purposes so as to identify a potential bottleneck in the path computation chain. Vasseur Expires April 13, 2007 [Page 3] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 This document specifies procedures and extensions to the Path Computation Element Protocol (PCEP) ([I-D.ietf-pce-pcep]) in order to monitor the path computation chain and gather various performance metrics. As discussed in [RFC4655], a TE LSP may be computed by one PCE (referred to as ) or several PCE (referred to as Multi-PCE). In the former case, the PCC may be able to use IGP extensions to check the availability of the PCE (see [I-D.ietf-pce-disco-proto-ospf] and [I-D.ietf-pce-disco-proto-isis]) or PCEP using Keepalive messages. In constrast, when multiple PCEs are involved in the path computation chain an example of which being the use of the BRPC procedure defined in [I-D.ietf-pce-brpc], the PCC's visibility is limited to the first involved PCE. Thus, it is critical to define mechanisms in order to gether performance metrics along the path computation chain (e.g. liveness, path computation time at each PCE, propagation delays experienced by the path computation request betwen each PCE involved in the path computation chain and so on). 3. Path Computation Monitoring messages As defined in [I-D.ietf-pce-pcep], a PCEP message consists of a common header followed by a variable length body made of a set of objects that can either be mandatory or optional. Furthermore, an object is said to be mandatory in a PCEP message when the object MUST be included for the message to be considered as valid. Thus a PCEP message with a missing mandatory object MUST be considered as a malformed message and such condition MUST trigger an Error message. Conversely, if an object is optional, the object may or may not be present. The use of the P flag is defined in [I-D.ietf-pce-pcep]. As a reminder, the P flag is located in the common header of each PCEP object that can be set by a PCEP peer to enforce a PCE to take into account the related information during the path computation. Because the P flag exclusively relates to a path computation request, it MUST be cleared in the two PCEP messages (PCEMonReq and PCMonRep message) defined in this document. For each PCEP message type a set of rules is defined that specify the set of objects that the message can carry. We use the Backus-Naur Form (BNF) to specify such rules. Square brackets refer to optional sub-sequences. An implementation MUST form the PCEP messages using the object ordering specified in this document. In this document we define two new PCEP messages referred to as the Path Computation Monitoring request (PCMonReq) and Path Computation Monitoring Reply (PCMonRep) message. The aim of the PCMonReq message sent by a PCC to a PCE is to gather performance metrics on a set of PCEs involved in a path computation chain. The PCMonRep message sent by a PCE to a PCC is used to provide such data. Vasseur Expires April 13, 2007 [Page 4] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 3.1. Path Computation Monitoring Request message (PCMonReq) The Message-Type field of the PCEP common header for the PCMonReq message is set to 8 (To be confirmed by IANA). There is one mandatory object that MUST be included within a PCMonReq message: the Monitoring object (see section Section 4.1). If the Monitoring object is missing, the receiving PCE MUST send an error message to the sender. Other objects are optional. The format of a PCReq message is as follows: ::= [] [] where: ::= [] [] [] [] [] [] ::=[] ::= [] The SVEC, RP, END-POINTS, LSPA, BANDWIDTH, METRIC, ERO, IRO and LOAD- BALANCING objects are defined in [I-D.ietf-pce-pcep]. A PCMonReq message is sent to gather various performance metrics along a path computation chain. Such metrics may relate to a specific path computation chain encoded in the form of a series of PCE-ID objects defined in Section 4.2. Alternatively, it may be desired to collect such performance metrics along the path computation chain involved to compute a TE LSP. In that case, the TE LSP attributes are characterized by the set of objects present in a PCEP Path Computation request (PCReq) message (see [I-D.ietf-pce-pcep]). Several metrics may be requested that are specified by a set of objects defined in section Section 4. Note that this set of objects is by all means not limitative and may be extended in further revision of this document. The most simplest form of metric is PCE liveness. Vasseur Expires April 13, 2007 [Page 5] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 For the sake of illustraion, consider the two following examples: Example 1: PCC1 requests to check the path computation chain should a path computation be requested for a specific TE LSP named T1. A PCMonReq message is sent that contains a MONITORING object specifying a path computation check, along with the appropriate set of objects (e.g. RP, END-POINTS, ...) that would be included in a PCReq message for T1. Example 2: PCC1 request to gather the processing time along the path computation chain selected for the computation of T1. In addition to the objects listed in example 1, the PCMonReq message also contain the PROC-TIME object defined in section Section 4.1. Example 3: PCC2 request to gather performance metrics along the specific path computation chain . A PCMonreq message is sent to PCE1 that contains a set of PCE-ID objects that identify PCE1, PCE2, PCE3 and PCE7 respectively. 3.2. Path Monitoring Reply message (PCMonRep) The Message-Type field of the PCEP common header for the PCMonRep message is set to 9 (To be confirmed by IANA). There is one mandatory objects that MUST be included within a PCMonRep message: the Monitoring object (see sectionSection 4.1). If the Monitoring object is missing, the receiving PCE MUST send an error message to the requesting PCC. Other objects are optional. The format of a PCReq message is as follows: ::= [] [] where: ::=[] ::=[] [] [] The SVEC, RP, END-POINTS, LSPA, BANDWIDTH, METRIC, ERO, IRO and LOAD- BALANCING objects are defined in [I-D.ietf-pce-pcep]. Vasseur Expires April 13, 2007 [Page 6] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 4. Path Computation Monitoring Objects Each new PCEP object defined in the document is compliant to the PCEP object format defined in [I-D.ietf-pce-pcep], with the P flag and the I flag cleared since these flags are exclusively related to path computation request. 4.1. MONITORING Object The MONITORING object MUST be carried within each PCMonReq and PCMonRep messages. The MONITORING object is used to specify the set of requested performance metrics. The MONITORING Object-Class is to be assigned by IANA (recommended value=16) The MONITORING Object-Type is to be assigned by IANA (recommended value=1) The format of the MONITORING object body is as follows: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Reserved | Flags |I|P|R|C| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | monitoring-id-number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | // Optional TLV(s) // | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Flags: 18 bits - The following flags are currently defined: C (Check) - 1 bit: when set, this indicates that the performance metric of interest is the PCE's availability. R (Record) - 1 bit: when set, this indicates that the PCE's indentifier MUST be included in the corresponding PCMonRep message in the form of a PCE-ID object. P (Processing Time) - 1 bit: the P bit of the MONITORING object carried in a PCMonReq message is set to indicate that the processing times is a metric of interest, in which case a PROC-TIME object MUST be inserted in the corresponding PCMonRep message. The P bit MUST always be set in a PCMonRep message if also set in the corresponding PCMonReq message. Vasseur Expires April 13, 2007 [Page 7] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 I (Incomplete) - 1 bit: the I bit MUST be set by a PCE that supports the PCMonReq message, which does not trigger any policy violation but that cannot provide the set of required performance metrics for unspecified reasons. Once set, the I bit MUST NOT be changed by a receiving PCE. Monitoring-id-number (32 bits). The monitoring-id-number value combined with the source IP address of the PCC and the PCE address uniquely identify the monitoring request context. The monitoring-id- number MUST be incremented each time a new monitoring is sent to a PCE. The value 0x0000000 is considered as invalid. If no reply to a monitoring request is received from the PCE, and the PCC wishes to resend its path computation monitoring request, the same monitoring- id-number MUST be used. Conversely, different monitoring-id-number MUST be used for different requests sent to a PCE. The same monitoring-id-number may be used for path computation monitoring requests sent to different PCEs. The path computation monitoring reply is unambiguously identified by the IP source address of the replying PCE. No optional TLVs are currently defined. 4.2. PCE-ID Object The PCE-ID Object is used in a PCMonReq message to record the IP address of the PCE for which performance metrics are collected and in a PCMonRep message to record the IP address of the PCE reporting performance metrics. The PCE-ID Object-Class is to be assigned by IANA (recommended value=17) The PCE-ID Object-Type is to be assigned by IANA (recommended value=1) The format of the PCE-ID Object is as follows: Vasseur Expires April 13, 2007 [Page 8] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | address-type | Lenght | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | // PCE IP Address // | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Address-type: 1 IPv4 2 IPv6 Length 4 (IPv4) or 16 (IPv6) PCE IP Address: The PCE IP address. It is RECOMMENDED to use the same IP address as the address used in the PCE-ADDRESS sub-TLV defined in [I-D.ietf-pce-disco-proto-ospf] and [I-D.ietf-pce-disco-proto-isis]should a dynamic discovery mechanism be used for PCE discovery. 4.3. PROC-TIME Object The PROC-TIME object MUST be present within a PCMonRep message if the P bit of the MONITORING object carried within the corresponding PCMonReq was set. The PROC-TIME object is used to report various processing time related metrics. The Current-processing-time field is used to report the processing time for a particular request the characteristics of which are specified in the corresponding PCMonReq message. By constrast, a PCC may request processing time metrics that are not related to a particular request, in which case the request is qualified as a "general" request. For example, the PCC may want to know the minimum, maximum, average and maximum processing times on a particular PCE. The algorithm(s) used by a PCE to compute such metrics are out of the scope of this document but a flag is specified that is used to indicate to the requester whether the processing time values were estimated or computed. For example, if the processing time for a specific TE LSP computation is requested, the PCE may either (1) estimate without performing an actual path computation or (2) effectively perform the computation to report the processing time. Furthermore, the same object can be used to report the processing time for a particular request in addition to the general processing times computed for all request over a period of time. The PROC-TIME Object-Class is to be assigned by IANA (recommended value=18) Vasseur Expires April 13, 2007 [Page 9] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 The PROC-TIME Object-Type is to be assigned by IANA (recommended value=1) The format of the PROC-TIME object body is as follows: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Reserved | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Current-processing-time |E| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Min-processing-time |E| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max-processing-time |E| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Average-processing time |E| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Variance-processing-time |E| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Flags: 18 bits - No Flags are currently defined: E (Estimated) - 1 bit: when set, this indicates that the reported metric value is based on estimated processing time as opposed to actual computation(s). Current-processing-time: This field indicates in milliseconds the processing time for the path computation of interest characterized in the corresponding PCMonReq message and MUST be set to 0x00000000 if the request is a general request (does not relate to a particular path computation request). Min-processing-time: This field indicates in milliseconds the minimum processing time. The equation/algorithm used to compute this value is implementation specific and outside of the scope of this document (A PCE may decide to compute the minimum processing time over a period of times, for the last N path computation requests, ...). If the G flag of the MONITORING object if cleared then this field MUST be set to 0x00000000. Max-processing-time: This field indicates in milliseconds the maximum processing time. The equation/algorithm used to compute this value is implementation specific and outside of the scope of this document (A PCE may decide to compute the minimum processing time over a period of times, for the last N path computation requests, ...). If the G flag of the MONITORING object if cleared then this field MUST be set to 0x00000000. Vasseur Expires April 13, 2007 [Page 10] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 Average-processing-time: This field indicates in milliseconds the average processing time. The equation/algorithm used to compute this value is implementation specific and outside of the scope of this document (A PCE may decide to compute the minimum processing time over a period of times, for the last N path computation requests, ...). If the G flag of the MONITORING object if cleared then this field MUST be set to 0x00000000. Variance-processing-time: This field indicates in milliseconds the variance of the processing times. The equation/algorithm used to compute this value is implementation specific and outside of the scope of this document (A PCE may decide to compute the minimum processing time over a period of times, for the last N path computation requests, ...). If the G flag of the MONITORING object if cleared then this field MUST be set to 0x00000000. More granularity may be introduced in further revision of this document to get a monitoring metric for a general request of a particular class (e.g. all PCReq of priority X). 4.4. TIMESTAMP Object A TIMESTAMP object will be specified in a further revision of this document that could be used to provide indication on the time at which a PCMonReq message has been received by a PCE and the time at which the PCMonReq message has been relayed to the next-hop PCE or the time at which a PCMonRep message has been sent to the requester. 5. Multi-destination monitoring In a further revision of this document, a new object will be specified allowing a PCC or a user to gather performance metrics for a set of destinations using a single PCMonReq message. For example, using a single PCMonreq message originated by the PCC, performance metrics for the set of path computation chains involved in the computation of a set of TE LSPs will be gathered. Such set of destinations could be specified in the form of a subnets. 6. Policy The receipt of a PCMonReq message may trigger a policy violation on some PCE in which case the PCE MUST send a PCErr message with Error- Type=12 and Error-value=1. Vasseur Expires April 13, 2007 [Page 11] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 7. Element of procedure Reception of a PCMonReq message: upon receiving a PCMonReq message, if the PCE does not support the PCMonReq message, the PCE MUST send a PCErr message with Error-type=11 and Error-value=1 If the PCE supports the PCMonReq message but the request is prohibited by policy, the PCE MUST send a PCErr message with Error- Type=12 and Error-value=1. If the PCE supports the PCMonReq and the request is not prohibited by policy, the receiving PCE MUST first determine whether it is the last PCE of the path computation chain the process of which is being outside of this document. If the PCE is not the last element of the path computation chain, the PCMonReq message is relayed to the next hop PCE: such next-hop may either be specified by means of a PCE-ID object present in the PCMonReq message or dynamically determined by means of a procedure outside of the scope of this document. Conversely, if the PCE is the last PCE of the path computation chain, the PCE originates a PCMonRep message that contains the requested objects according to the set of requested performance metrics listed in the MONITORING object carried in the corresponding PCMonReq message. Reception of a PCMonRep message: upon receiving a PCMonRep message, the PCE processes the request, adds the relevant objects to the PCMonRep message and forwards the PCMonRep message to the upstream requesting PCE or PCC. Special case of Multi-destination monitoring: performance monitoring request related to more than one destinations may lead to involve a set of path computation chains. In that case, a PCE sends each copy of the PCMonReq message to each downstream PCE of each path computation chain. 8. Manageability Considerations To be addressed in a further revision of this document. 9. To be considered in a further revision of this document IT might be desirable to modify the format of the PCMonReq and PCMonRep messages to support the bundling of multiple performance metrics collection for a set of TE LSPs. Vasseur Expires April 13, 2007 [Page 12] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 10. IANA Considerations Two new PCEP (specified in [I-D.ietf-pce-pcep]) messages are defined in this document: Value Meaning 8 Path Computation Monitoring Request (PCMonReq) 9 Path Computation Monitoring Reply (PCMonRep) The following new PCEP objects are defined in this document. Object-Class Name 16 MONITORING Object-Type 1 17 PCE-ID Object-Type 1 18 PROC-TIME Object-Type 1 Two new error types are defined in this document (Error-Type and Error-value to be assigned by IANA). Error-type Meaning 11 Performance Monitoring not supported Error-value 1: Monitoring message not supported by one or PCEs along the domain path 12 Performance Monitoring Policy violation 1: Monitoring message supported but rejected due to policy violation 11. Security Considerations To be addressed in a further revision of this document. 12. Acknowledgements Vasseur Expires April 13, 2007 [Page 13] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 13. References 13.1. Normative References [I-D.ietf-pce-pcep] Vasseur, J., "Path Computation Element (PCE) communication Protocol (PCEP) - Version 1", draft-ietf-pce-pcep-02 (work in progress), June 2006. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC4655] Farrel, A., Vasseur, J., and J. Ash, "A Path Computation Element (PCE)-Based Architecture", RFC 4655, August 2006. 13.2. Informative References [I-D.ietf-pce-brpc] Vasseur, J., "A Backward Recursive PCE-based Computation (BRPC) procedure to compute shortest inter-domain Traffic Engineering Label Switched Paths", draft-ietf-pce-brpc-00 (work in progress), August 2006. [I-D.ietf-pce-disco-proto-isis] Roux, J., "IS-IS protocol extensions for Path Computation Element (PCE) Discovery", draft-ietf-pce-disco-proto-isis-00 (work in progress), September 2006. [I-D.ietf-pce-disco-proto-ospf] Roux, J., "OSPF protocol extensions for Path Computation Element (PCE) Discovery", draft-ietf-pce-disco-proto-ospf-00 (work in progress), September 2006. Author's Address JP Vasseur Cisco Systems, Inc 1414 Massachusetts Avenue Boxborough, MA 01719 USA Email: jpv@cisco.com Vasseur Expires April 13, 2007 [Page 14] Internet-Draft draft-vasseur-pce-monitoring-00.txt October 2006 Full Copyright Statement Copyright (C) The Internet Society (2006). 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The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgment Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Vasseur Expires April 13, 2007 [Page 15]