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(See the Legal Provisions document at https://trustee.ietf.org/license-info for more information.) -- The document date (October 2003) is 7492 days in the past. Is this intentional? Checking references for intended status: Informational ---------------------------------------------------------------------------- == Outdated reference: A later version (-09) exists of draft-ietf-ccamp-gmpls-routing-08 ** Obsolete normative reference: RFC 3373 (ref. 'ISIS-3way') (Obsoleted by RFC 5303) == Outdated reference: A later version (-05) exists of draft-ietf-isis-restart-04 Summary: 6 errors (**), 0 flaws (~~), 4 warnings (==), 2 comments (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 Network Working Group K. Kompella, Editor 3 Internet Draft Y. Rekhter, Editor 4 Category: Informational Juniper Networks 5 Updates: October 2003 6 Expires: April 2004 8 IS-IS Extensions in Support of Generalized 9 Multi-Protocol Label Switching 11 draft-ietf-isis-gmpls-extensions-18.txt 13 Status of this Memo 15 This document is an Internet-Draft and is in full conformance with 16 all provisions of Section 10 of RFC2026. 18 Internet-Drafts are working documents of the Internet Engineering 19 Task Force (IETF), its areas, and its working groups. Note that 20 other groups may also distribute working documents as Internet- 21 Drafts. 23 Internet-Drafts are draft documents valid for a maximum of six months 24 and may be updated, replaced, or obsoleted by other documents at any 25 time. It is inappropriate to use Internet-Drafts as reference 26 material or to cite them other than as ``work in progress.'' 28 The list of current Internet-Drafts can be accessed at 29 http://www.ietf.org/ietf/1id-abstracts.txt 31 The list of Internet-Draft Shadow Directories can be accessed at 32 http://www.ietf.org/shadow.html. 34 Copyright Notice 36 Copyright (C) The Internet Society (2003). All Rights Reserved. 38 Abstract 40 This document specifies encoding of extensions to the IS-IS routing 41 protocol in support of Generalized Multi-Protocol Label Switching. 43 Specification of Requirements 45 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 46 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 47 document are to be interpreted as described in RFC 2119 [RFC2119]. 49 Changes since last revision 51 (RFC Editor: remove this section before publication.) 53 Incorporated IESG comments on the GMPLS OSPF document. 55 More formatting changes. 57 1. Introduction 59 This document specifies extensions to the IS-IS routing protocol in 60 support of carrying link state information for Generalized 61 Multi-Protocol Label Switching (GMPLS). The set of required 62 enhancements to IS-IS are outlined in [GMPLS-ROUTING]. Support for 63 unnumbered interfaces assumes support for the "Point-to-Point 64 Three-Way Adjacency" IS-IS Option type [ISIS-3way]. 66 In this section we define the enhancements to the Traffic Engineering 67 (TE) properties of GMPLS TE links that can be announced in IS-IS Link 68 State Protocol Data Units. 70 In this document, we enhance the sub-TLVs for the extended IS 71 reachability TLV (see [ISIS-TE]) in support of GMPLS. Specifically, 72 we add the following sub-TLVs: 74 Sub-TLV Type Length Name 75 4 8 Link Local/Remote Identifiers 76 20 2 Link Protection Type 77 21 variable Interface Switching Capability 78 Descriptor 80 We further add one new TLV to the TE TLVs: 82 TLV Type Length Name 83 138 variable Shared Risk Link Group 85 1.1. Link Local/Remote Identifiers 87 A Link Local Interface Identifiers is a sub-TLV of the extended IS 88 reachability TLV. The type of this sub-TLV is 4, and length is eight 89 octets. The value field of this sub-TLV contains four octets of Link 90 Local Identifier followed by four octets of Link Remote Idenfier (see 91 Section "Support for unnumbered links" of [GMPLS-ROUTING]). If the 92 Link Remote Identifier is unknown, it is set to 0. 94 The following illustrates encoding of the Value field of the Link 95 Local/Remote Identifiers sub-TLV. 97 0 1 2 3 98 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 99 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 100 | Link Local Identifier | 101 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 102 | Link Remote Identifier | 103 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 105 The Link Local/Remote Identifiers sub-TLV MUST NOT occur more than 106 once within the extended IS reachability TLV. If the Link 107 Local/Remote Idenfitiers sub-TLV occurs more than once within the 108 extended IS reachability TLV, the receiver SHOULD ignore all these 109 sub-TLVs. 111 1.2. Link Protection Type 113 The Link Protection Type is is a sub-TLV (of type 20) of the 114 extended IS reachability TLV, with length two octets. 116 The following illustrates encoding of the Value field of the Link 117 Protection Type sub-TLV. 119 0 1 120 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 121 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 122 |Protection Cap | Reserved | 123 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 125 The first octet is a bit vector describing the protection 126 capabilities of the link (see Section "Link Protection Type" of 127 [GMPLS-ROUTING]). They are: 129 0x01 Extra Traffic 130 0x02 Unprotected 132 0x04 Shared 134 0x08 Dedicated 1:1 136 0x10 Dedicated 1+1 138 0x20 Enhanced 140 0x40 Reserved 142 0x80 Reserved 144 The second octet SHOULD be set to zero by the sender, and SHOULD be 145 ignored by the receiver. 147 The Link Protection Type sub-TLV MUST NOT occur more than once within 148 the extended IS reachability TLV. If the Link Protection Type 149 sub-TLV occurs more than once within the extended IS reachability 150 TLV, the receiver SHOULD ignore all these sub-TLVs. 152 1.3. Interface Switching Capability Descriptor 154 The Interface Switching Capability Descriptor is a sub-TLV (of type 155 21) of the extended IS reachability TLV. The length is the length of 156 value field in octets. The following illustrates encoding of the 157 Value field of the Interface Switching Capability Descriptor sub-TLV. 159 0 1 2 3 160 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 1 161 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 162 | Switching Cap | Encoding | Reserved | 163 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 164 | Max LSP Bandwidth at priority 0 | 165 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 166 | Max LSP Bandwidth at priority 1 | 167 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 168 | Max LSP Bandwidth at priority 2 | 169 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 170 | Max LSP Bandwidth at priority 3 | 171 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 172 | Max LSP Bandwidth at priority 4 | 173 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 174 | Max LSP Bandwidth at priority 5 | 175 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 176 | Max LSP Bandwidth at priority 6 | 177 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 178 | Max LSP Bandwidth at priority 7 | 179 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 180 | Switching Capability-specific information | 181 | (variable) | 182 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 184 The Switching Capability (Switching Cap) field contains one of the 185 following values: 187 1 Packet-Switch Capable-1 (PSC-1) 188 2 Packet-Switch Capable-2 (PSC-2) 189 3 Packet-Switch Capable-3 (PSC-3) 190 4 Packet-Switch Capable-4 (PSC-4) 191 51 Layer-2 Switch Capable (L2SC) 192 100 Time-Division-Multiplex Capable (TDM) 193 150 Lambda-Switch Capable (LSC) 194 200 Fiber-Switch Capable (FSC) 196 The Encoding field contains one of the values specified in Section 197 3.1.1 of [GMPLS-SIG]. 199 Maximum LSP Bandwidth is encoded as a list of eight 4 octet fields in 200 the IEEE floating point format [IEEE], with priority 0 first and 201 priority 7 last. The units are bytes (not bits!) per second. 203 The content of the Switching Capability specific information field 204 depends on the value of the Switching Capability field. 206 When the Switching Capability field is PSC-1, PSC-2, PSC-3, or PSC-4, 207 the Switching Capability specific information field includes Minimum 208 LSP Bandwidth and Interface MTU. 210 0 1 2 3 211 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 1 212 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 213 | Minimum LSP Bandwidth | 214 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 215 | Interface MTU | 216 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 218 The Minimum LSP Bandwidth is is encoded in a 4 octets field in the 219 IEEE floating point format. The units are bytes (not bits!) per 220 second. The Interface MTU is encoded as a 2 octets integer, and 221 carries the MTU value in the units of bytes. 223 When the Switching Capability field is L2SC, there is no Switching 224 Capability specific information field present. 226 When the Switching Capability field is TDM, the Switching Capability 227 specific information field includes Minimum LSP Bandwidth and an 228 indication whether the interface supports Standard or Arbitrary 229 SONET/SDH. 231 0 1 2 3 232 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 1 233 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 234 | Minimum LSP Bandwidth | 235 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 236 | Indication | 237 +-+-+-+-+-+-+-+-+ 239 The Minimum LSP Bandwidth is encoded in a 4 octets field in the IEEE 240 floating point format. The units are bytes (not bits!) per second. 241 The indication whether the interface supports Standard or Arbitrary 242 SONET/SDH is encoded as 1 octet. The value of this octet is 0 if the 243 interface supports Standard SONET/SDH, and 1 if the interface 244 supports Arbitrary SONET/SDH. 246 When the Switching Capability field is LSC, there is no Switching 247 Capability specific information field present. 249 To support interfaces that have more than one Interface Switching 250 Capability Descriptor (see Section "Interface Switching Capability 251 Descriptor" of [GMPLS-ROUTING]) the Interface Switching Capability 252 Descriptor sub-TLV MAY occur more than once within the extended IS 253 reachability TLV. 255 1.4. Shared Risk Link Group TLV 257 The SRLG TLV (of type 138 TBD) contains a data structure consisting 258 of: 260 6 octets of System ID 261 1 octet of Pseudonode Number 262 1 octet Flag 263 4 octets of IPv4 interface address or 4 octets of a Link Local 264 Identifier 265 4 octets of IPv4 neighbor address or 4 octets of a Link Remote 266 Identifier 267 (variable) list of SRLG values, where each element in the list 268 has 4 octets. 270 The following illustrates encoding of the Value field of the SRLG 271 TLV. 273 0 1 2 3 274 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 1 275 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 276 | System ID | 277 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 278 | System ID (cont.) | Pseudonode num| Flags | 279 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 280 | IPv4 interface address/Link Local Identifier | 281 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 282 | IPv4 neighbors address/Link Remote Identifier | 283 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 284 | Shared Risk Link Group Value | 285 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 286 | ............ | 287 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 288 | Shared Risk Link Group Value | 289 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 291 The neighbor is identified by its System Id (6-octets), plus one 292 octet to indicate the pseudonode number if the neighbor is on a LAN 293 interface. 295 The Least Significant Bit of the Flag octet indicates whether the 296 interface is numbered (set to 1), or unnumbered (set to 0). All 297 other bits are reserved and should be set to 0. 299 The length of this TLV is 16 + 4 * (number of SRLG values). 301 This TLV carries the Shared Risk Link Group information (see Section 302 "Shared Risk Link Group Information" of [GMPLS-ROUTING]). 304 The SRLG TLV MAY occur more than once within the IS-IS Link State 305 Protocol Data Units. 307 1.5. Link Identifier for Unnumbered Interfaces 309 Link Identifiers are exchanged in the Extended Local Circuit ID field 310 of the "Point-to-Point Three-Way Adjacency" IS-IS Option type 311 [ISIS-3way]. 313 2. Implications on Graceful Restart 315 The restarting node SHOULD follow the ISIS restart procedures 316 [ISIS-RESTART], and the RSVP-TE restart procedures [GMPLS-RSVP]. 318 When the restarting node is going to originate its IS-IS Link State 319 Protocol data units for TE links, these Link State Protocol data 320 units SHOULD be originated with 0 unreserved bandwidth, Traffic 321 Engineering Default metric set to 0xffffff, and if the link has LSC 322 or FSC as its Switching Capability then also with 0 as Max LSP 323 Bandwidth, until the node is able to determine the amount of 324 unreserved resources taking into account the resources reserved by 325 the already established LSPs that have been preserved across the 326 restart. Once the restarting node determines the amount of 327 unreserved resources, taking into account the resources reserved by 328 the already established LSPs that have been preserved across the 329 restart, the node SHOULD advertise these resources in its Link State 330 Protocol data units. 332 In addition in the case of a planned restart prior to restarting, the 333 restarting node SHOULD originate the IS-IS Link State Protocol data 334 units for TE links with 0 as unreserved bandwidth, and if the link 335 has LSC or FSC as its Switching Capability then also with 0 as Max 336 LSP Bandwidth. This would discourage new LSP establishment through 337 the restarting router. 339 Neighbors of the restarting node SHOULD continue advertise the actual 340 unreserved bandwidth on the TE links from the neighbors to that node. 342 3. Contributors 344 Ayan Banerjee 345 Calient Networks 346 5853 Rue Ferrari 347 San Jose, CA 95138 348 Phone: +1 408 972 3645 349 EMail: abanerjee@calient.net 351 John Drake 352 Calient Networks 353 5853 Rue Ferrari 354 San Jose, CA 95138 355 Phone: +1 408 972 3720 356 EMail: jdrake@calient.net 357 Greg Bernstein 358 Grotto Networking 359 EMail: gregb@grotto-networking.com 361 Don Fedyk 362 Nortel Networks Corp. 363 600 Technology Park Drive 364 Billerica, MA 01821 365 Phone: +1 978 288 4506 366 EMail: dwfedyk@nortelnetworks.com 368 Eric Mannie 369 Independent Consultant 370 E-mail: eric_mannie@hotmail.com 371 Debanjan Saha 372 Tellium Optical Systems 373 2 Crescent Place 374 P.O. Box 901 375 Ocean Port, NJ 07757 376 Phone: +1 732 923 4264 377 EMail: dsaha@tellium.com 379 Vishal Sharma 380 EMail: v.sharma@ieee.org 382 4. Acknowledgements 384 The authors would like to thank Jim Gibson, Suresh Katukam, Jonathan 385 Lang and Quaizar Vohra for their comments on the draft. 387 5. Security Considerations 389 This document raises no new security concerns for IS-IS. 391 Normative References 393 [GMPLS-ROUTING] Kompella, K., and Rekhter, Y. (Editors), "Routing 394 Extensions in Support of Generalized Multi-Protocol Label 395 Switching", (work in progress) [draft-ietf-ccamp-gmpls- 396 routing-08.txt] 398 [GMPLS-RSVP] Berger, L., (Editor), "Generalized Multi-Protocol Label 399 Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic 400 Engineering (RSVP-TE) Extensions", RFC 3473, January 2003 402 [GMPLS-SIG] Berger, L. (Editor), "Generalized Multi-Protocol Label 403 Switching (GMPLS) Signaling Functional Description", RFC 3471, 404 January 2003 406 [IEEE] IEEE, "IEEE Standard for Binary Floating-Point Arithmetic", 407 Standard 754-1985, 1985 (ISBN 1-5593-7653-8) 409 [ISIS-3way] Katz, D., and Saluja, R., "Three-Way Handshake for 410 Intermediate System to Intermediate System (IS-IS) Point-to-Point 411 Adjacencies", RFC 3373, September 2002 413 [ISIS-RESTART] Shand, M. and L. Ginsburg, "Restart signaling for 414 ISIS", (work in progress) [draft-ietf-isis-restart-04.txt] 416 [ISIS-TE] Smit, H., Li, T., "IS-IS Extensions for Traffic 417 Engineering", (work in progress) [draft-ietf-isis-traffic-05.txt] 419 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 420 Requirement Levels", BCP 14, RFC 2119, March 1997. 422 Authors' Information 424 Kireeti Kompella 425 Juniper Networks, Inc. 426 1194 N. Mathilda Ave 427 Sunnyvale, CA 94089 428 EMail: kireeti@juniper.net 430 Yakov Rekhter 431 Juniper Networks, Inc. 432 1194 N. Mathilda Ave 433 Sunnyvale, CA 94089 434 EMail: yakov@juniper.net 435 Intellectual Property Rights Notices 437 The IETF takes no position regarding the validity or scope of any 438 intellectual property or other rights that might be claimed to 439 pertain to the implementation or use of the technology described in 440 this document or the extent to which any license under such rights 441 might or might not be available; neither does it represent that it 442 has made any effort to identify any such rights. Information on the 443 IETF's procedures with respect to rights in standards-track and 444 standards-related documentation can be found in BCP-11. 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