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Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 Network Working Group K. Ishiguro 3 Internet-Draft V. Manral 4 Intended status: Standards Track IP Infusion, Inc 5 Expires: October 19, 2008 A. Davey 6 Data Connection Limited 7 A. Lindem (Editor) 8 Redback Networks 9 April 17, 2008 11 Traffic Engineering Extensions to OSPF version 3 12 draft-ietf-ospf-ospfv3-traffic-11.txt 14 Status of this Memo 16 By submitting this Internet-Draft, each author represents that any 17 applicable patent or other IPR claims of which he or she is aware 18 have been or will be disclosed, and any of which he or she becomes 19 aware will be disclosed, in accordance with Section 6 of BCP 79. 21 Internet-Drafts are working documents of the Internet Engineering 22 Task Force (IETF), its areas, and its working groups. Note that 23 other groups may also distribute working documents as Internet- 24 Drafts. 26 Internet-Drafts are draft documents valid for a maximum of six months 27 and may be updated, replaced, or obsoleted by other documents at any 28 time. It is inappropriate to use Internet-Drafts as reference 29 material or to cite them other than as "work in progress." 31 The list of current Internet-Drafts can be accessed at 32 http://www.ietf.org/ietf/1id-abstracts.txt. 34 The list of Internet-Draft Shadow Directories can be accessed at 35 http://www.ietf.org/shadow.html. 37 This Internet-Draft will expire on October 19, 2008. 39 Copyright Notice 41 Copyright (C) The IETF Trust (2008). 43 Abstract 45 This document describes extensions to OSPFv3 to support intra-area 46 Traffic Engineering (TE). This document extends OSPFv2 TE to handle 47 IPv6 networks. A new TLV and several new sub-TLVs are defined to 48 support IPv6 networks. 50 Table of Contents 52 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 53 1.1. Requirements notation . . . . . . . . . . . . . . . . . . 3 54 2. Intra-Area-TE-LSA . . . . . . . . . . . . . . . . . . . . . . 4 55 2.1. Intra-Area-TE-LSA Payload . . . . . . . . . . . . . . . . 5 56 3. Router IPv6 Address TLV . . . . . . . . . . . . . . . . . . . 6 57 4. Link TLV . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 58 4.1. Link ID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 7 59 4.2. Neighbor ID Sub-TLV . . . . . . . . . . . . . . . . . . . 7 60 4.3. Local Interface IPv6 Address Sub-TLV . . . . . . . . . . . 8 61 4.4. Remote Interface IPv6 Address Sub-TLV . . . . . . . . . . 9 62 5. Security Considerations . . . . . . . . . . . . . . . . . . . 11 63 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12 64 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13 65 7.1. Normative References . . . . . . . . . . . . . . . . . . . 13 66 7.2. Informative References . . . . . . . . . . . . . . . . . . 13 67 Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . . 14 68 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15 69 Intellectual Property and Copyright Statements . . . . . . . . . . 16 71 1. Introduction 73 OSPFv3 has a very flexible mechanism for adding new LS types. 74 Unknown LS types are flooded properly based on the flooding scope 75 bits in the LS type [OSPFV3]. This document defines the 76 Intra-Area-TE LSA to OSPFv3. 78 For Traffic Engineering, this document uses "Traffic Engineering 79 Extensions to OSPF" [TE] as a base for TLV definitions. New TLVs and 80 sub-TLVs are added to [TE] to extend TE capabilities to IPv6 81 networks. Some existing TLVs and sub-TLVs require clarification for 82 OSPFv3 applicability. 84 GMPLS [GMPLS] and the Diff-Serv MPLS Extensions [TE-DIFF] are based 85 on [TE]. These functions can also be extended to OSPFv3 by utilizing 86 the TLVs and sub-TLVs described in this document. 88 1.1. Requirements notation 90 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 91 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 92 document are to be interpreted as described in RFC2119 93 [RFC-KEYWORDS]. 95 2. Intra-Area-TE-LSA 97 A new LS type is defined for the Intra-Area-TE LSA. This is 98 different from OSPFv2 Traffic Engineering [TE] where opaque LSAs are 99 used to advertise TE information [OPAQUE]. The LSA function code is 100 10, the U bit is set, and the scope is set to 01 for area-scoping. 101 When the U bit is set to 1, an OSPFv3 router must flood the LSA at 102 its defined flooding scope even if it does not recognize the LS type 103 [OSPFV3]. 105 0 1 2 3 106 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 1 107 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 108 | LS age |0|1|1| 10 | 109 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 110 | Link State ID | 111 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 112 | Advertising Router | 113 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 114 | LS sequence number | 115 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 116 | LS checksum | Length | 117 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 118 | | 119 +- TLVs -+ 120 | ... | 122 OSPFv3 Intra-Area-TE-LSA 124 The Link State ID of an Intra-Area-TE LSA is an arbitrary value used 125 to maintain multiple Traffic Engineering LSAs. The LSA ID has no 126 topological significance. 128 The format of the TLVs within the body of an Intra-Area-TE LSA is the 129 same as the format used by the Traffic Engineering Extensions to OSPF 130 [TE]. The LSA payload consists of one or more nested Type/Length/ 131 Value (TLV) triplets. The format of each TLV is: 133 0 1 2 3 134 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 1 135 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 136 | Type | Length | 137 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 138 | Value... | 139 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 141 TLV Format 143 The Length field defines the length of the value portion in octets 144 (thus a TLV with no value portion would have a length of zero). The 145 TLV is padded to four-octet alignment; padding is not included in the 146 length field (so a three octet value would have a length of three, 147 but the total size of the TLV would be eight octets). Nested TLVs 148 are also 32-bit aligned. For example, a one-byte value would have 149 the length field set to 1, and three octets of padding would be added 150 to the end of the value portion of the TLV. Unrecognized types are 151 ignored. 153 2.1. Intra-Area-TE-LSA Payload 155 An Intra-Area-TE-LSA contains one top-level TLV. There are two 156 applicable top-level TLVs: 158 2 - Link TLV 160 3 - Router IPv6 Address TLV 162 3. Router IPv6 Address TLV 164 The Router IPv6 Address TLV advertises a reachable IPv6 address. 165 This is a stable IPv6 address that is always reachable if there is 166 connectivity to the OSPFv3 router. 168 The Router IPv6 Address TLV has type 3, length 16, and a value 169 containing a 16 octet local IPv6 address. It MUST appear in exactly 170 one Traffic Engineering LSA originated by an OSPFv3 router supporting 171 the TE extensions. The Router IPv6 Address TLV is a top-level TLV as 172 defined in Traffic Engineering Extensions to OSPF [TE] and only one 173 top-level TLV may be contained in an LSA. 175 0 1 2 3 176 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 1 177 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 178 | 3 | 16 | 179 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 180 | | 181 +-+-+-+- -+-+-+-+ 182 | | 183 +-+-+-+- Router IPv6 Address -+-+-+-+ 184 | | 185 +-+-+-+- -+-+-+-+ 186 | | 187 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 189 Type A 16-bit field set to 3. 190 Length A 16-bit field that indicates the length of the value 191 portion in octets. For this TLV it is always 16. 192 Value A stable and routable IPv6 address. 194 Router IPv6 Address TLV 196 4. Link TLV 198 The Link TLV describes a single link and consists of a set of sub- 199 TLVs [TE]. All of the sub-TLVs in [TE] other than the Link ID sub- 200 TLV are applicable to OSPFv3. The Link ID sub-TLV can't be used in 201 OSPFv3 since it is defined to use the OSPFv2 identification for the 202 Designated Router (DR) on multi-access networks. In OSPFv2, 203 neighbors on point-to-point networks and virtual links are identified 204 by their Router IDs while neighbors on broadcast, Non-Broadcast 205 Multi-Access (NBMA), and Point-to-Multipoint links are identified by 206 their IPv4 interface addresses (Refer to section 8.2 in [OSPFV2]). 207 The IPv4 interface address is not known to OSPFv3. In contrast to 208 OSPFv2, OSPFv3 always identifies neighboring routers by their Router 209 IDs (Refer to section 2.11 in [OSPFV3]). 211 Three new sub-TLVs for the Link TLV are defined: 213 18 - Neighbor ID (8 octets) 215 19 - Local Interface IPv6 Address (16N octets, where N is the 216 number of IPv6 addresses) 218 20 - Remote Interface IPv6 Address (16N octets, where N is the 219 number of IPv6 addresses) 221 The Neighbor ID Sub-TLV is mandatory for OSPF3 Traffic Engineering 222 support. It MUST appear exactly once in a Link TLV. All other sub- 223 TLVs defined in this document MAY occur at most once in a Link TLV. 225 4.1. Link ID Sub-TLV 227 The Link ID sub-TLV is used in OSPFv2 to identify the other end of 228 the link. In OSPFv3, the Neighbor ID sub-TLV MUST be used for link 229 identification. In OSPFv3, The Link ID sub-TLV SHOULD NOT be sent 230 and MUST be ignored upon receipt. 232 4.2. Neighbor ID Sub-TLV 234 In OSPFv2, the Link ID is used to identify the other end of a link. 235 In OSPFv3, the combination of Neighbor Interface ID and Neighbor 236 Router ID is used for neighbor link identification. Both are 237 advertised in the Neighbor ID Sub-TLV. 239 Neighbor Interface ID and Neighbor Router ID values are the same as 240 described in RFC 2740 [OSPFV3] A.4.3 Router-LSAs. 242 0 1 2 3 243 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 1 244 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 245 | 18 | 8 | 246 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 247 | Neighbor Interface ID | 248 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 249 | Neighbor Router ID | 250 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 252 Type A 16-bit field set to 18. 253 Length A 16-bit field that indicates the length of the value 254 portion in octets. For this sub-TLV it is always 8. 255 Value The neighbor's interface ID and router ID. 257 Neighbor ID Sub-TLV 259 4.3. Local Interface IPv6 Address Sub-TLV 261 The Local Interface IPv6 Address sub-TLV specifies the IPv6 262 address(es) of the interface corresponding to this link. If there 263 are multiple local addresses assigned to the link then they MAY all 264 be listed in this sub-TLV. Link-local addresses MUST NOT be included 265 in this sub-TLV. 267 0 1 2 3 268 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 1 269 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 270 | 19 | Length | 271 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 272 | | 273 +-+-+-+- -+-+-+-+ 274 | | 275 +-+-+-+- Local Interface IPv6 Address -+-+-+-+ 276 | | 277 +-+-+-+- -+-+-+-+ 278 | | 279 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 280 | o | 281 | o | 282 | o | 283 | | 284 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 285 | | 286 +-+-+-+- -+-+-+-+ 287 | | 288 +-+-+-+- Local Interface IPv6 Address -+-+-+-+ 289 | | 290 +-+-+-+- -+-+-+-+ 291 | | 292 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 294 Type A 16-bit field set to 19. 295 Length A 16-bit field that indicates the length of the value 296 portion in octets. For this sub-TLV, it MUST always be a 297 multiple of 16 octets dependent on the number of IPv6 298 global addresses advertised. 299 Value A list of one or more local IPv6 interface addresses 300 each consuming 16 octets. 302 Local Interface IPv6 Address Sub-TLV 304 4.4. Remote Interface IPv6 Address Sub-TLV 306 The Remote Interface IPv6 Address sub-TLV advertises the IPv6 307 address(es) associated with the neighbor's interface. This Sub-TLV 308 and the Local Interface IPv6 address Sub-TLV are used to discern 309 amongst parallel links between OSPFv3 routers. If the Link Type is 310 multi-access, the Remote Interface IPv6 Address MAY be set to ::. 311 Alternately, an implementation MAY choose not to send this sub-TLV. 312 Link-local addresses MUST NOT be advertised in this sub-TLV. 313 Neighbor addresses advertised in Link-LSAs with a prefix length of 314 128 and the LA bit set MAY be advertised. 316 0 1 2 3 317 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 1 318 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 319 | 20 | Length | 320 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 321 | | 322 +-+-+-+- -+-+-+-+ 323 | | 324 +-+-+-+- Remote Interface IPv6 Address -+-+-+-+ 325 | | 326 +-+-+-+- -+-+-+-+ 327 | | 328 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 329 | o | 330 | o | 331 | o | 332 | | 333 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 334 | | 335 +-+-+-+- -+-+-+-+ 336 | | 337 +-+-+-+- Remote Interface IPv6 Address -+-+-+-+ 338 | | 339 +-+-+-+- -+-+-+-+ 340 | | 341 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 343 Type A 16-bit field set to 20. 344 Length A 16-bit field that indicates the length of the value 345 portion in octets. For this sub-TLV, it MUST be a 346 multiple of 16 octets dependent on the number of IPv6 347 global addresses advertised. 348 Value A variable length remote interface IPv6 address list. 350 Remote Interface IPv6 Address Sub-TLV 352 5. Security Considerations 354 The function described in this document does not create any new 355 security issues for the OSPFv3 protocol. Security considerations for 356 the base OSPFv3 protocol are covered in [OSPFV3]. 358 6. IANA Considerations 360 The following IANA assignments are to be made from existing 361 registries: 363 1. The OSPFv3 LSA type function code 10 needs to be assigned to the 364 OSPFv3 Intra-Area-TE-LSA. 366 2. The Router IPv6 Address TLV type 3 needs to be assigned from the 367 existing registry for OSPF TE TLVs. 369 3. The Neighbor ID Sub-TLV (18), Local Interface IPv6 Address Sub- 370 TLV (19), and Remote Interface IPv6 Address Sub-TLV (20), need to 371 be assigned from the existing registry for OSPF TE Sub-TLVs. 373 7. References 375 7.1. Normative References 377 [OSPFV2] Moy, J., "OSPF Version 2", RFC 2328, April 1998. 379 [OSPFV3] Coltun, R., Ferguson, D., and J. Moy, "OSPF for IPv6", 380 RFC 2740, April 1998. 382 [RFC-KEYWORDS] 383 Bradner, S., "Key words for use in RFC's to Indicate 384 Requirement Levels", RFC 2119, March 1997. 386 [TE] Katz, D., Yeung, D., and K. Kompella, "Traffic Engineering 387 Extensions to OSPF", RFC 3630, September 2003. 389 7.2. Informative References 391 [GMPLS] Kompella, K. and Y. Rekhter, "OSPF Extensions in Support 392 of Generalized Multi-Protocol Switching (GMPLS)", 393 RFC 4203, October 2005. 395 [OPAQUE] Coltun, R., "The OSPF Opaque LSA Option", RFC 2370, 396 July 1998. 398 [TE-DIFF] Le Faucheur, F., Wu, L., Davie, B., Davari, S., Vaananen, 399 P., Krishnan, R., Cheval, P., and J. Heinanen, "Multi- 400 Protocol Label Switching (MPLS) Support of Differentiated 401 Services", RFC 3270. 403 Appendix A. Acknowledgments 405 Thanks to Kireeti Kompella, Alex Zinin, Adrian Farrell, and Mach Chen 406 for their comments. 408 The RFC text was produced using Marshall Rose's xml2rfc tool. 410 Authors' Addresses 412 Kunihiro Ishiguro 413 IP Infusion, Inc 414 125 South Market Street, Suite 900 415 San Jose, CA 95113 416 USA 418 Email: kunihiro@ipinfusion.com 420 Vishwas Manral 421 IP Infusion, Inc 422 #41, Ground Floor, 5th Cross Road 423 8th Main Road 424 Vasanth Nagar, Bangalore 560052 425 India 427 Email: vishwas@ipinfusion.com 429 Alan Davey 430 Data Connection Limited 431 100 Church Street 432 Enfield 433 EN2 6BQ 434 UK 436 Email: Alan.Davey@dataconnection.com 438 Acee Lindem 439 Redback Networks 440 102 Carric Bend Court 441 Cary, NC 27519 442 USA 444 Email: acee@redback.com 446 Full Copyright Statement 448 Copyright (C) The IETF Trust (2008). 450 This document is subject to the rights, licenses and restrictions 451 contained in BCP 78, and except as set forth therein, the authors 452 retain all their rights. 454 This document and the information contained herein are provided on an 455 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS 456 OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND 457 THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS 458 OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF 459 THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED 460 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 462 Intellectual Property 464 The IETF takes no position regarding the validity or scope of any 465 Intellectual Property Rights or other rights that might be claimed to 466 pertain to the implementation or use of the technology described in 467 this document or the extent to which any license under such rights 468 might or might not be available; nor does it represent that it has 469 made any independent effort to identify any such rights. 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