Network Working Group N. Bahadur Internet-Draft R. Aggarwal Intended status: Standards Track Juniper Networks, Inc. Expires: December 20, 2010 S. Boutros Cisco Systems, Inc. E. Gray Ericsson June 18, 2010 MPLS on-demand Connectivity Verification, Route Tracing and Adjacency Verification draft-nitinb-mpls-tp-on-demand-cv-00 Abstract LSP-Ping is an existing and widely deployed OAM mechanism for MPLS LSPs. This document describes extensions to LSP-Ping so that LSP- Ping can be used to perform OAM on MPLS-TP LSPs. It also clarifies the procedures to be used for processing the OAM packets. Further, it describes how LSP-Ping can be used to perform Connectivity Verification, Route Tracing and Adjacency functions in MPLS-TP networks. Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and 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 December 20, 2010. Copyright Notice Bahadur, et al. Expires December 20, 2010 [Page 1] Internet-Draft MPLS on-demand Connectivity Verification June 2010 Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved. 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 BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Conventions used in this document . . . . . . . . . . . . 4 1.2. LSP-Ping for MPLS-TP LSPs using IP encapsulation . . . . . 4 1.3. LSP-Ping for MPLS-TP LSPs using non-IP encapsulation . . . 4 2. LSP-Ping extensions . . . . . . . . . . . . . . . . . . . . . 5 2.1. New address type for Downstream Mapping TLV . . . . . . . 5 2.2. Source Address TLV . . . . . . . . . . . . . . . . . . . . 5 2.3. MEP and MIP Identifier . . . . . . . . . . . . . . . . . . 5 2.4. Identifying Statically provisioned LSPs and PWs . . . . . 6 2.4.1. Static LSP Sub-TLV . . . . . . . . . . . . . . . . . . 6 2.4.2. Static Pseudowire Sub-TLV . . . . . . . . . . . . . . 7 3. Performing LSP-Ping over MPLS-TP LSPs . . . . . . . . . . . . 7 3.1. LSP-Ping with IP encapsulation . . . . . . . . . . . . . . 7 3.2. LSP-Ping with IP encapsulation, over ACH . . . . . . . . . 8 3.3. Non-IP based LSP-Ping . . . . . . . . . . . . . . . . . . 8 3.4. Reverse path Connectivity verification . . . . . . . . . . 9 3.5. P2MP Considerations . . . . . . . . . . . . . . . . . . . 9 4. Performing LSP Traceroute over MPLS-TP LSPs . . . . . . . . . 9 4.1. LSP Traceroute with IP encapsulation . . . . . . . . . . . 10 4.2. Non-IP based LSP Traceroute . . . . . . . . . . . . . . . 10 4.2.1. Ingress node procedure for sending echo request packets . . . . . . . . . . . . . . . . . . . . . . . 10 4.2.2. Ingress node procedure for receiving echo response packets . . . . . . . . . . . . . . . . . . . . . . . 10 4.2.3. Transit and egress node procedure . . . . . . . . . . 10 4.3. P2MP Considerations . . . . . . . . . . . . . . . . . . . 10 4.4. ECMP Considerations . . . . . . . . . . . . . . . . . . . 11 5. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 11 6. Security Considerations . . . . . . . . . . . . . . . . . . . 11 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11 8. Contributing Authors . . . . . . . . . . . . . . . . . . . . . 11 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Bahadur, et al. Expires December 20, 2010 [Page 2] Internet-Draft MPLS on-demand Connectivity Verification June 2010 9.1. Normative References . . . . . . . . . . . . . . . . . . . 12 9.2. Informative References . . . . . . . . . . . . . . . . . . 12 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13 Bahadur, et al. Expires December 20, 2010 [Page 3] Internet-Draft MPLS on-demand Connectivity Verification June 2010 1. Introduction LSP-Ping [RFC4379] is an OAM mechanism for MPLS LSPs. This document describes extensions to LSP-Ping so that LSP-Ping can be used for on- demand monitoring of MPLS-TP LSPs. It also clarifies the procedures to be used for processing the OAM packets. This document describes how LSP-Ping can be used to perform on-demand Connectivity Verification, Route Tracing and Adjacency functions required in [RFC5860] and specified in [I-D.ietf-mpls-tp-oam-framework]. 1.1. Conventions used in this document 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 [RFC2119]. 1.2. LSP-Ping for MPLS-TP LSPs using IP encapsulation LSP-Ping requires IP addressing on the egress and transit LSRs for performing OAM on MPLS signaled LSPs and pseudowires. In particular, in these cases the LSP-Ping packets generated by an ingress LSR are encapsulated in an IP/UDP header with the destination address from the 127/8 range and then encapsulated in the MPLS label stack ([RFC4379] , [RFC5884]). Egress LSRs use the presence of the 127/8 destination address to identify the OAM packets and rely further on the UDP port number to determine whether the packet is a LSP-Ping packet. It is to be noted that this determination does not require IP forwarding capabilities. It requires the presence of an IP host stack which enables egress LSRs to process packets with a destination address from the 127/8 range. [RFC1122] allocates the 127/8 range as "Internal host loopback address" and [RFC1812] states that "a router SHOULD NOT forward, except over a loopback interface, any packet that has a destination address on network 127". 1.3. LSP-Ping for MPLS-TP LSPs using non-IP encapsulation In certain MPLS-TP deployment scenarios IP addressing might not be available or it may be preferred to use non-IP encapsulation for LSP- Ping and BFD packets. In such scenarios, LSP-Ping SHOULD be run without IP addressing, using the ACH channel type specified in [I-D.ietf-mpls-tp-lsp-ping-bfd-procedures]. Section 3.3 and Section 4.2 describe the theory of operation for performing LSP-Ping over MPLS-TP LSPs with a non-IP encapsulation. Bahadur, et al. Expires December 20, 2010 [Page 4] Internet-Draft MPLS on-demand Connectivity Verification June 2010 2. LSP-Ping extensions 2.1. New address type for Downstream Mapping TLV [RFC4379] defines the Downstream Mapping TLV. This document defines the following new Address type which is added to the Downstream Mapping TLV: Type # Address Type K Octets ------ -------------- -------- 0 Not Applicable 8 Figure 1: Downstream Mapping TLV new address type The new address type indicates that no address is present in the Downstream Mapping TLV. Multipath type SHOULD be set to 0 (no multipath) when using this address type. When this address type is used, on receipt of a LSP-Ping echo request, interface verification MUST be bypassed. Thus the receiving node SHOULD only perform mpls label control-plane/data-plane consistency checks. The new address type is also applicable to the Detailed Downstream Mapping TLV defined in [I-D.ietf-mpls-lsp-ping-enhanced-dsmap]. 2.2. Source Address TLV When sending LSP-Ping packets using ACH, without IP encapsulation, there MAY be a need to identify the source address of the packet. This source address will be specified via the Source Address TLV, being defined in [I-D.ietf-mpls-tp-ach-tlv]. A LSP-Ping packet MUST NOT include more than 1 source address TLV. The source address MUST specify the address of the originator of the packet. If more than 1 such TLV is present in a LSP-Ping request packet, then an error of 1 (Malformed echo request received), [ Section 3.1 [RFC4379] ], MUST be returned, if it is possible to unambiguously identify the source of the packet. 2.3. MEP and MIP Identifier When sending LSP-Ping packets using ACH, there MAY be a need to identify the maintenance end point (MEP) and/or the maintenance intermediate point (MIP) being monitored [I-D.ietf-mpls-tp-rosetta-stone]. The MEP/MIP identifiers defined in [I-D.ietf-mpls-tp-identifiers] MAY be carried in the ACH TLVs [I-D.ietf-mpls-tp-ach-tlv] for identification. Only one identifier Bahadur, et al. Expires December 20, 2010 [Page 5] Internet-Draft MPLS on-demand Connectivity Verification June 2010 (MEP or MIP) MUST be present in a packet. The MEP/MIP identifiers associated with the packet MUST be checked for the MPLS-TP LSP path/ section that is being monitored. If the identifier does not match the LSP path/section, then the packet MUST be dropped. 2.4. Identifying Statically provisioned LSPs and PWs [RFC4379] specifies how an MPLS LSP under test may be identified in an echo request. A Target FEC Stack TLV is used to identify the LSP. In order to identify a statically provisioned LSP and PW, new target FEC stack sub-TLVs are being defined. The new sub-TLVs are assigned sub-type identifiers as follows, and are described in the following sections. Sub-Type # Length Value Field ---------- ------ ----------- TBD 24 Static LSP TBD 24 Static Pseudowire Figure 2: New target FEC sub-types 2.4.1. Static LSP Sub-TLV The format of the Static LSP sub-TLV value field is specified in the following figure. The value fields are taken from the definitions in [I-D.ietf-mpls-tp-identifiers]. 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 Global ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Node ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Tunnel Number | LSP Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Global ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Node ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Tunnel Number | Must be Zero | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 3: Static LSP FEC Sub-TLV The Source global ID and Destination Global ID MAY be set to 0. When set to zero, the field is not applicable. Bahadur, et al. Expires December 20, 2010 [Page 6] Internet-Draft MPLS on-demand Connectivity Verification June 2010 2.4.2. Static Pseudowire Sub-TLV The format of the Static PW sub-TLV value field is specified in the following figure. 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 Global ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Node ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source AC-ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Global ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Node ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination AC-ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 4: Static PW FEC Sub-TLV The Source global ID and Destination Global ID MAY be set to 0. When set to zero, the field is not applicable. The Global ID and Node ID fields are taken from the definitions in [I-D.ietf-mpls-tp-identifiers]. The AC-ID definitions are taken from [RFC5003]. 3. Performing LSP-Ping over MPLS-TP LSPs This section specifies how LSP-Ping ping can be used in the context of MPLS-TP LSPs. The LSP-Ping ping function meets the Connectivity Verification requirement specified in [RFC5860]. This function SHOULD be performed on-demand. This function SHOULD be performed between End Points (MEPs) and Intermediate Points (MIPs) of PWs and LSPs, and between End Points of PWs, LSPs and Sections. In order for the LSP-Ping packet to be processed at the desired MIP, the TTL of the MPLS label should be set such that it expires at the MIP to be probed. 3.1. LSP-Ping with IP encapsulation LSP-Ping packets, as specified in [RFC4379], are sent over the MPLS LSP for which OAM is being performed and contain an IP/UDP packet within them. The IP header is not used for forwarding (since LSP Bahadur, et al. Expires December 20, 2010 [Page 7] Internet-Draft MPLS on-demand Connectivity Verification June 2010 forwarding is done using MPLS label switching). The IP header is used mainly for addressing and can be used in the context of MPLS-TP LSPs. This form of LSP-Ping OAM MUST be supported for MPLS-TP LSPs when IP addressing is in use. The LSP-Ping echo response message MUST be sent on the reverse path of the LSP. The reply MUST contain IP/UDP headers followed by the LSP-Ping payload. The destination address in the IP header MUST be set to that of the sender of the echo request message. The source address in the IP address MUST be set to a valid address of the replying node. 3.2. LSP-Ping with IP encapsulation, over ACH IP encapsulated LSP-Ping packets MAY be sent over the MPLS LSP using control channel (ACH). IP ACH type specified in [RFC4385] MUST be used in such a case. The IP header is used mainly for addressing and can be used in the context of MPLS-TP LSPs. The LSP-Ping echo response message SHOULD be sent on the reverse path of the LSP using ACH and SHOULD be IP encapsulated. The destination address in the IP header MUST be set to that of the sender of the echo request message. The source address in the IP address MUST be set to a valid address of the replying node. 3.3. Non-IP based LSP-Ping The OAM procedures defined in [RFC4379] require the use of IP addressing and in some cases IP routing to perform OAM functions. When the ACH header is used, IP addressing and routing is not needed. This section describes procedures for performing lsp-ping without a dependency on IP addressing and routing. When using LSP-Ping over the ACH header, the LSP-Ping Reply mode [RFC4379] in the LSP-Ping echo request MUST be set to 4 (Reply via application level control channel). The ingress node MAY attach a Source Address TLV (Section 2.2) to identify the node originating the request. The LSP-Ping reply message MUST be sent on the reverse path of the LSP using ACH. The LSP-Ping payload MUST directly follow the ACH header (and any ACH TLVs) and no IP and/or UDP headers MUST be attached. The responding node MAY attach a Source Address TLV to identify the node sending the response. If a node receives an MPLS echo request packet over ACH, without IP/ UDP headers and if that node does not have a return MPLS LSP path to Bahadur, et al. Expires December 20, 2010 [Page 8] Internet-Draft MPLS on-demand Connectivity Verification June 2010 the echo request source, then the node MUST drop the echo request packet and not attempt to send a response. 3.4. Reverse path Connectivity verification For bi-directional LSPs, when the egress sends the echo response, the egress MAY attach the target FEC stack TLV [RFC4379] in the echo response. The ingress (on receipt of the echo response) can use the FEC stack TLV to perform reverse path connectivity verification. For co-routed bi-directional LSPs, the target FEC stack used for LSP-Ping will be the same in both the forward and reverse path of the LSP. For associated bi-directional LSPs, the target FEC stack will be different for the reverse path. On receipt of the echo response, the ingress MUST perform the following checks: 1. Perform interface and label-stack validation to ensure that the packet is received on the reverse path of the bi-directional LSP 2. If the target FEC stack is present in the echo response, then perform FEC validation. If any of the validations fail, then the ingress MUST drop the echo response and report an error. 3.5. P2MP Considerations [I-D.ietf-mpls-p2mp-lsp-ping] describes how LSP-Ping can be used for OAM on P2MP LSPs with IP encapsulation. This MUST be supported for MPLS-TP P2MP LSPs when IP addressing is used. When IP addressing is not used, then the procedures described in Section 3.3 can be applied to P2MP MPLS-TP LSPs as well. 4. Performing LSP Traceroute over MPLS-TP LSPs This section specifies how LSP-Ping traceroute can be used in the context of MPLS-TP LSPs. The LSP-Ping traceroute function meets the Adjacency and Route Tracing requirement specified in [RFC5860]. This function SHOULD be performed on-demand. This function SHOULD be performed between End Points and Intermediate Points of PWs and LSPs, and between End Points of PWs, LSPs and Sections. When performing lsp-ping traceroute, the ingress node inserts a Downstream Mapping TLV to get the downstream node information and to enable LSP verification along the transit nodes. The Downstream Mapping TLV can be used as is for performing the traceroute. If IP addressing is not in use, then the Address Type field in the Downstream Mapping TLV can be set to "Not applicable" (Section 2.1). Bahadur, et al. Expires December 20, 2010 [Page 9] Internet-Draft MPLS on-demand Connectivity Verification June 2010 The Downstream Mapping TLV address type field can be extended to include other address types as need be. 4.1. LSP Traceroute with IP encapsulation The mechanics of LSP-Ping traceroute are similar to those described for ping in Section 3.1. Traceroute packets sent by the LSP ingress MUST follow procedures described in [RFC4379]. This form of LSP-Ping OAM MUST be supported for MPLS-TP LSPs, when IP addressing is used. 4.2. Non-IP based LSP Traceroute This section describes the procedures for performing LSP traceroute when using the ACH header and without any dependency on IP addressing. The procedures specified in Section 3.3 with regards to Source Address TLV, MEP/MIP identifiers apply to LSP traceroute as well. 4.2.1. Ingress node procedure for sending echo request packets Traceroute packets sent by the LSP ingress MUST adhere to the format described in Section 3.3. MPLS-TTL expiry (as described in [RFC4379]) will be used to direct the packets to specific nodes along the LSP path. 4.2.2. Ingress node procedure for receiving echo response packets The LSP-Ping traceroute responses will be received on the LSP itself and the presence of an ACH header with channel type of LSP-Ping is an indicator that the packet contains LSP-ping payload. 4.2.3. Transit and egress node procedure When a echo request reaches the transit or egress, the presence of the ACH channel type of LSP-Ping will indicate that the packet contains LSP-Ping data. The LSP-Ping data, the label stack and the MEP/MIP identifier should be sufficient to identify the LSP associated with the echo request packet. If there is an error and the node is unable to identify the LSP on which the echo response would to be sent, the node MUST drop the echo request packet and not send any response back. All responses MUST always be sent on a LSP path using the ACH header and ACH channel type of LSP-Ping. 4.3. P2MP Considerations [I-D.ietf-mpls-p2mp-lsp-ping] describes how LSP-Ping can be used for OAM on P2MP LSPs. This MUST be supported for MPLS-TP P2MP LSPs when IP addressing is used. When IP addressing is not used, then the Bahadur, et al. Expires December 20, 2010 [Page 10] Internet-Draft MPLS on-demand Connectivity Verification June 2010 procedures described in Section 4.2 can be applied to P2MP MPLS-TP LSPs as well. 4.4. ECMP Considerations LSP-Ping using ACH SHOULD NOT be used when there is ECMP (equal cost multiple paths) for a given LSP. The addition of the additional ACH header may modify the hashing behavior for OAM packets which may result in incorrect monitoring of path taken by data traffic. 5. Applicability The non-IP addressing based procedures specified in this document apply only to MPLS-TP LSPs. They also apply to PWs when IP encapsulation is not desired. However, when IP addressing is used, as in non MPLS-TP LSPs, procedures specified in [RFC4379] MUST be used. 6. Security Considerations The draft does not introduce any new security considerations. Those discussed in [RFC4379] are also applicable to this document. 7. IANA Considerations Section 2.4 defines 2 new sub-TLV types for inclusion within the LSP Ping [RFC4379] Target FEC Stack TLV. IANA is requested to assign sub-type values to the following sub-TLVs from the "Multiprotocol Label Switching Architecture (MPLS) Label Switched Paths (LSPs) Parameters - TLVs" registry, "TLVs and sub- TLVs" sub-registry. - Static LSP - Static Pseudowire 8. Contributing Authors The following individuals also contributed to this document: o Thomas D. Nadeau, BT o Nurit Sprecher, Nokia Siemens Networks Bahadur, et al. Expires December 20, 2010 [Page 11] Internet-Draft MPLS on-demand Connectivity Verification June 2010 o Yaacov Weingarten, Nokia Siemens Networks 9. References 9.1. Normative References [I-D.ietf-mpls-tp-lsp-ping-bfd-procedures] Bahadur, N., Aggarwal, R., Ward, D., Nadeau, T., Sprecher, N., and Y. Weingarten, "LSP-Ping and BFD encapsulation over ACH", draft-ietf-mpls-tp-lsp-ping-bfd-procedures-00 (work in progress), March 2010. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC4379] Kompella, K. and G. Swallow, "Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures", RFC 4379, February 2006. [RFC4385] Bryant, S., Swallow, G., Martini, L., and D. McPherson, "Pseudowire Emulation Edge-to-Edge (PWE3) Control Word for Use over an MPLS PSN", RFC 4385, February 2006. 9.2. Informative References [I-D.ietf-mpls-lsp-ping-enhanced-dsmap] Bahadur, N., Kompella, K., and G. Swallow, "Mechanism for performing LSP-Ping over MPLS tunnels", draft-ietf-mpls-lsp-ping-enhanced-dsmap-05 (work in progress), May 2010. [I-D.ietf-mpls-p2mp-lsp-ping] Yasukawa, S., Farrel, A., Ali, Z., Swallow, G., Nadeau, T., and S. Saxena, "Detecting Data Plane Failures in Point-to-Multipoint Multiprotocol Label Switching (MPLS) - Extensions to LSP Ping", draft-ietf-mpls-p2mp-lsp-ping-10 (work in progress), March 2010. [I-D.ietf-mpls-tp-ach-tlv] Boutros, S., Bryant, S., Sivabalan, S., Swallow, G., Ward, D., and V. Manral, "Definition of ACH TLV Structure", draft-ietf-mpls-tp-ach-tlv-02 (work in progress), March 2010. [I-D.ietf-mpls-tp-identifiers] Bocci, M. and G. Swallow, "MPLS-TP Identifiers", draft-ietf-mpls-tp-identifiers-01 (work in progress), Bahadur, et al. Expires December 20, 2010 [Page 12] Internet-Draft MPLS on-demand Connectivity Verification June 2010 March 2010. [I-D.ietf-mpls-tp-oam-framework] Allan, D., Busi, I., Niven-Jenkins, B., Fulignoli, A., Hernandez-Valencia, E., Levrau, L., Mohan, D., Sestito, V., Sprecher, N., Helvoort, H., Vigoureux, M., Weingarten, Y., and R. Winter, "MPLS-TP OAM Framework", draft-ietf-mpls-tp-oam-framework-06 (work in progress), April 2010. [I-D.ietf-mpls-tp-rosetta-stone] Sprecher, N., "A Thesaurus for the Terminology used in Multiprotocol Label Switching Transport Profile (MPLS-TP) drafts/RFCs and ITU-T's Transport Network Recommendations.", draft-ietf-mpls-tp-rosetta-stone-02 (work in progress), May 2010. [RFC1122] Braden, R., "Requirements for Internet Hosts - Communication Layers", STD 3, RFC 1122, October 1989. [RFC1812] Baker, F., "Requirements for IP Version 4 Routers", RFC 1812, June 1995. [RFC5003] Metz, C., Martini, L., Balus, F., and J. Sugimoto, "Attachment Individual Identifier (AII) Types for Aggregation", RFC 5003, September 2007. [RFC5860] Vigoureux, M., Ward, D., and M. Betts, "Requirements for Operations, Administration, and Maintenance (OAM) in MPLS Transport Networks", RFC 5860, May 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. Authors' Addresses Nitin Bahadur Juniper Networks, Inc. 1194 N. Mathilda Avenue Sunnyvale, CA 94089 US Phone: +1 408 745 2000 Email: nitinb@juniper.net URI: www.juniper.net Bahadur, et al. Expires December 20, 2010 [Page 13] Internet-Draft MPLS on-demand Connectivity Verification June 2010 Rahul Aggarwal Juniper Networks, Inc. 1194 N. Mathilda Avenue Sunnyvale, CA 94089 US Phone: +1 408 745 2000 Email: rahul@juniper.net URI: www.juniper.net Sami Boutros Cisco Systems, Inc. 3750 Cisco Way San Jose, CA 95134 US Phone: Fax: Email: sboutros@cisco.com URI: Eric Gray Ericsson 900 Chelmsford Street Lowell, MA 01851 US Phone: +1 978 275 7470 Fax: Email: eric.gray@ericsson.com URI: Bahadur, et al. Expires December 20, 2010 [Page 14]