Network Working Group K. Ishiguro Internet-Draft T. Takada Expires: October 28, 2006 IP Infusion, Inc A. Davey Data Connection Limited A. Lindem (Editor) Cisco Systems, Inc April 26, 2006 Traffic Engineering Extensions to OSPF version 3 draft-ietf-ospf-ospfv3-traffic-07.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 October 28, 2006. Copyright Notice Copyright (C) The Internet Society (2006). Abstract This document describes extensions to OSPFv3 to support intra-area Traffic Engineering (TE). This document extends OSPFv2 TE to handle IPv6 networks. A new TLV and several new sub-TLVs are defined to support IPv6 networks. Ishiguro, et al. Expires October 28, 2006 [Page 1] Internet-Draft OSPFv3-Traffic Engineering April 2006 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Requirements notation . . . . . . . . . . . . . . . . . . 3 2. Intra-Area-TE-LSA . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Intra-Area-TE-LSA Payload . . . . . . . . . . . . . . . . 5 3. Router IPv6 Address TLV . . . . . . . . . . . . . . . . . . . 6 4. Link TLV . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 Link ID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 7 4.2 Neighbor ID Sub-TLV . . . . . . . . . . . . . . . . . . . 7 4.3 Local Interface IPv6 Address Sub-TLV . . . . . . . . . . . 8 4.4 Remote Interface IPv6 Address Sub-TLV . . . . . . . . . . 9 5. Security Considerations . . . . . . . . . . . . . . . . . . . 11 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.1 Normative References . . . . . . . . . . . . . . . . . . . 13 7.2 Informative References . . . . . . . . . . . . . . . . . . 13 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 13 A. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15 Intellectual Property and Copyright Statements . . . . . . . . 16 Ishiguro, et al. Expires October 28, 2006 [Page 2] Internet-Draft OSPFv3-Traffic Engineering April 2006 1. Introduction OSPFv3 has a very flexible mechanism for adding new LS types. Unknown LS types are flooded properly based on the flooding scope bits in the LS type [OSPFV3]. This document proposes the addition of the Intra-Area-TE LSA to OSPFv3. For Traffic Engineering, this document uses "Traffic Engineering Extensions to OSPF" [TE] as a base for TLV definitions. New TLVs and sub-TLVs are added to [TE] to extend TE capabilities to IPv6 networks. Some existing TLVs and sub-TLVs require clarification for OSPFv3 applicability. GMPLS [GMPLS] and the Diff-Serv MPLS Extensions [TE-DIFF] are based on [TE]. These functions can also be extended to OSPFv3 by utilizing the TLVs and sub-TLVs described in this document. 1.1 Requirements notation 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 [RFC2119]. Ishiguro, et al. Expires October 28, 2006 [Page 3] Internet-Draft OSPFv3-Traffic Engineering April 2006 2. Intra-Area-TE-LSA A new LS type is defined for the Intra-Area-TE LSA. This is different from OSPFv2 Traffic Engineering [TE] where opaque LSAs are used to advertise TE information [OPAQUE]. The LSA function code is 10, the U bit is set, and the scope is set to 01 for area-scoping. When the U bit is set to 1, an OSPFv3 router must flood the LSA at its defined flooding scope even if it does not recognize the LS type [OSPFV3]. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | LS age |0|1|1| 10 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link State ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Advertising Router | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | LS sequence number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | LS checksum | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +- TLVs -+ | ... | The Link State ID of an Intra-Area-TE LSA is an arbitrary value used to maintain multiple Traffic Engineering LSAs. The LSA ID has no topological significance. The format of the TLVs within the body of a router information LSA is the same as the format used by the Traffic Engineering Extensions to OSPF [TE]. The LSA payload consists of one or more nested Type/ Length/Value (TLV) triplets. The format of each TLV is: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Value... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Ishiguro, et al. Expires October 28, 2006 [Page 4] Internet-Draft OSPFv3-Traffic Engineering April 2006 The Length field defines the length of the value portion in octets (thus a TLV with no value portion would have a length of zero). The TLV is padded to four-octet alignment; padding is not included in the length field (so a three octet value would have a length of three, but the total size of the TLV would be eight octets). Nested TLVs are also 32-bit aligned. For example, a one byte value would have the length field set to 1, and three octets of padding would be added to the end of the value portion of the TLV. Unrecognized types are ignored. 2.1 Intra-Area-TE-LSA Payload An Intra-Area-TE-LSA contains one top-level TLV. There are two applicable top-level TLVs: 2 - Link TLV 3 - Router IPv6 Address TLV Ishiguro, et al. Expires October 28, 2006 [Page 5] Internet-Draft OSPFv3-Traffic Engineering April 2006 3. Router IPv6 Address TLV The Router IPv6 Address TLV advertises a reachable IPv6 address. This is a stable IPv6 address that is always reachable if there is connectivity to the OSPFv3 router. The Router IPv6 Address TLV has type 3, length 16, and a value containing a 16 octet local IPv6 address. It MUST appear in exactly one Traffic Engineering LSA originated by an OSPFv3 router supporting the TE extensions. The Router IPv6 Address TLV is a top-level TLV as defined in Traffic Engineering Extensions to OSPF [TE] and only one top-level TLV may be contained in an LSA. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 3 | 16 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+- Router IPv6 Address -+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type A 16 bit field set to 3. Length A 16 bit field that indicates the length of the value portion in octets. For this TLV it is always 16. Value A stable and routable IPv6 address. Ishiguro, et al. Expires October 28, 2006 [Page 6] Internet-Draft OSPFv3-Traffic Engineering April 2006 4. Link TLV The Link TLV describes a single link and consists of a set of sub- TLVs [TE]. All of the sub-TLVs in [TE] other than the Link ID sub- TLV are applicable to OSPFv3. The Link ID sub-TLV can't be used in OSPFv3 due to the protocol differences between OSPFv2 and OSPFv3. Three new sub-TLVs for the Link TLV are defined: 18 - Neighbor ID (8 octets) 19 - Local Interface IPv6 Address (16N octets, where N is the number of IPv6 addresses) 20 - Remote Interface IPv6 Address (16N octets, where N is the number of IPv6 addresses) The Neighbor ID Sub-TLV is mandatory for OSPF3 Traffic Engineering support. It MUST appear exactly once in a Link TLV. All other sub- TLVs defined in this document MAY occur at most once in a Link TLV. 4.1 Link ID Sub-TLV The Link ID sub-TLV is used in OSPFv2 to identify the other end of the link. In OSPFv3, the Neighbor ID sub-TLV MUST be used for link identification. In OSPFv3, The Link ID sub-TLV SHOULD NOT be sent and MUST be ignored upon receipt. 4.2 Neighbor ID Sub-TLV In OSPFv2, the Link ID is used to identify the other end of a link. In OSPFv3, the combination of Neighbor Interface ID and Neighbor Router ID is used for neighbor link identification. Both are advertised in the Neighbor ID Sub-TLV. Neighbor Interface ID and Neighbor Router ID values are the same as described in RFC 2740 [OSPFV3] A.4.3 Router-LSAs. Ishiguro, et al. Expires October 28, 2006 [Page 7] Internet-Draft OSPFv3-Traffic Engineering April 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 18 | 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Neighbor Interface ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Neighbor Router ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type A 16 bit field set to 18. Length A 16 bit field that indicates the length of the value portion in octets. For this sub-TLV it is always 8. Value The neighbor's interface ID and router ID. 4.3 Local Interface IPv6 Address Sub-TLV The Local Interface IPv6 Address sub-TLV specifies the IPv6 address(es) of the interface corresponding to this link. If there are multiple local addresses assigned to the link then they MAY all be listed in this sub-TLV. Link-local addresses MUST NOT be included in this sub-TLV. Ishiguro, et al. Expires October 28, 2006 [Page 8] Internet-Draft OSPFv3-Traffic Engineering April 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 19 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+- Local Interface IPv6 Address -+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | o | | o | | o | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+- Local Interface IPv6 Address -+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type A 16 bit field set to 19. Length A 16 bit field that indicates the length of the value portion in octets. For this sub-TLV, it MUST always be a multiple of 16 octets dependent on the number of IPv6 global addresses advertised. Value A list of one or more local IPv6 interface addresses each consuming 16 octets. 4.4 Remote Interface IPv6 Address Sub-TLV The Remote Interface IPv6 Address sub-TLV advertises the IPv6 address(es) associated with the neighbor's interface. This Sub-TLV and the Local Interface IPv6 address Sub-TLV are used to discern amongst parallel links between OSPFv3 routers. If the Link Type is multi-access, the Remote Interface IPv6 Address MAY be set to ::. Alternately, an implementation MAY choose not to send this sub-TLV. Link-local addresses MUST NOT be advertised in this sub-TLV. Neighbor addresses advertised in Link-LSAs with a prefix length of 128 and the LA bit set MAY be advertised. Ishiguro, et al. Expires October 28, 2006 [Page 9] Internet-Draft OSPFv3-Traffic Engineering April 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 20 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+- Remote Interface IPv6 Address -+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | o | | o | | o | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+- Remote Interface IPv6 Address -+-+-+-+ | | +-+-+-+- -+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type A 16 bit field set to 20. Length A 16 bit field that indicates the length of the value portion in octets. For this sub-TLV, it MUST be a multiple of 16 octets dependent on the number of IPv6 global addresses advertised. Value A variable length remote interface IPv6 address list. Ishiguro, et al. Expires October 28, 2006 [Page 10] Internet-Draft OSPFv3-Traffic Engineering April 2006 5. Security Considerations The function described in this document does not create any new security issues for the OSPFv3 protocol. Security considerations for the base OSPFv3 protocol are covered in [OSPFV3]. Ishiguro, et al. Expires October 28, 2006 [Page 11] Internet-Draft OSPFv3-Traffic Engineering April 2006 6. IANA Considerations The following IANA assignments are to be made from existing registries: 1. The OSPFv3 LSA type function code 10 needs to be assigned to the OSPFv3 Intra-Area-TE-LSA. 2. The Router IPv6 Address TLV type 3 needs to be assigned from the existing registry for OSPF TE TLVs. 3. The Neighbor ID Sub-TLV (18), Local Interface IPv6 Address Sub- TLV (19), and Remote Interface IPv6 Address Sub-TLV (20), need to be assigned from the existing registry for OSPF TE Sub-TLVs. Ishiguro, et al. Expires October 28, 2006 [Page 12] Internet-Draft OSPFv3-Traffic Engineering April 2006 7. References 7.1 Normative References [OSPF] Moy, J., "OSPF Version 2", RFC 2328, April 1998. [OSPFV3] Coltun, R., Ferguson, D., and J. Moy, "OSPF for IPv6", RFC 2740, April 1998. [RFC2119] Bradner, S., "Key words for use in RFC's to Indicate Requirement Levels", RFC 2119, March 1997. [TE] Katz, D., Yeung, D., and K. Kompella, "Traffic Engineering Extensions to OSPF", RFC 3630, September 2003. 7.2 Informative References [GMPLS] Kompella, K. and Y. Rekhter, "OSPF Extensions in Support of Generalized MPLS", draft-ietf-ccamp-ospf-gmpls-extensions-12.txt (work in progress). [OPAQUE] Coltun, R., "The OSPF Opaque LSA Option", RFC 2370, July 1998. [TE-DIFF] Le Faucheur, F., Wu, L., Davie, B., Davari, S., Vaananen, P., Krishnan, R., Cheval, P., and J. Heinanen, "Multi- Protocol Label Switching (MPLS) Support of Differentiated Services", RFC 3270. Authors' Addresses Kunihiro Ishiguro IP Infusion, Inc 111 W. St. John Street, Suite 910 San Jose, CA 95113 USA Email: kunihiro@ipinfusion.com Ishiguro, et al. Expires October 28, 2006 [Page 13] Internet-Draft OSPFv3-Traffic Engineering April 2006 Toshiaki Takada IP Infusion, Inc 111 W. St. John Street, Suite 910 San Jose, CA 95113 USA Email: takada@ipinfusion.com Alan Davey Data Connection Limited 100 Church Street Enfield EN2 6BQ UK Email: Alan.Davey@dataconnection.com Acee Lindem Cisco Systems, Inc 7025 Kit Creek Road Research Triangle Park, NC 27709 USA Email: acee@cisco.com Ishiguro, et al. Expires October 28, 2006 [Page 14] Internet-Draft OSPFv3-Traffic Engineering April 2006 Appendix A. Acknowledgments Thanks to Vishwas Manral, Kireeti Kompella, Alex Zinin, and Adrian Farrell for their comments. The RFC text was produced using Marshall Rose's xml2rfc tool. Ishiguro, et al. Expires October 28, 2006 [Page 15] Internet-Draft OSPFv3-Traffic Engineering April 2006 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. 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. Disclaimer of Validity This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Copyright Statement Copyright (C) The Internet Society (2006). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Ishiguro, et al. Expires October 28, 2006 [Page 16]