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Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 Network Working Group J. Dong 3 Internet-Draft M. Chen 4 Intended status: Standards Track Huawei Technologies 5 Expires: October 24, 2014 Z. Li 6 China Mobile 7 D. Ceccarelli 8 Ericsson 9 April 22, 2014 11 GMPLS RSVP-TE Extensions for Lock Instruct and Loopback 12 draft-ietf-ccamp-rsvp-te-li-lb-03 14 Abstract 16 This document specifies extensions to Resource Reservation Protocol - 17 Traffic Engineering (RSVP-TE) to support Lock Instruct (LI) and 18 Loopback (LB) mechanisms for Label Switched Paths (LSPs). These 19 mechanisms are applicable to technologies which use Generalized 20 Multi-Protocol Label Switching (GMPLS) as control plane. 22 Requirements Language 24 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 25 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 26 document are to be interpreted as described in RFC 2119 [RFC2119]. 28 Status of This Memo 30 This Internet-Draft is submitted in full conformance with the 31 provisions of BCP 78 and BCP 79. 33 Internet-Drafts are working documents of the Internet Engineering 34 Task Force (IETF). Note that other groups may also distribute 35 working documents as Internet-Drafts. The list of current Internet- 36 Drafts is at http://datatracker.ietf.org/drafts/current/. 38 Internet-Drafts are draft documents valid for a maximum of six months 39 and may be updated, replaced, or obsoleted by other documents at any 40 time. It is inappropriate to use Internet-Drafts as reference 41 material or to cite them other than as "work in progress." 43 This Internet-Draft will expire on October 24, 2014. 45 Copyright Notice 47 Copyright (c) 2014 IETF Trust and the persons identified as the 48 document authors. All rights reserved. 50 This document is subject to BCP 78 and the IETF Trust's Legal 51 Provisions Relating to IETF Documents 52 (http://trustee.ietf.org/license-info) in effect on the date of 53 publication of this document. Please review these documents 54 carefully, as they describe your rights and restrictions with respect 55 to this document. Code Components extracted from this document must 56 include Simplified BSD License text as described in Section 4.e of 57 the Trust Legal Provisions and are provided without warranty as 58 described in the Simplified BSD License. 60 Table of Contents 62 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 63 2. Extensions to RSVP-TE . . . . . . . . . . . . . . . . . . . . 3 64 3. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 3 65 3.1. Lock Instruct . . . . . . . . . . . . . . . . . . . . . . 3 66 3.2. Loopback . . . . . . . . . . . . . . . . . . . . . . . . 4 67 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 68 5. Security Considerations . . . . . . . . . . . . . . . . . . . 5 69 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6 70 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 6 71 7.1. Normative References . . . . . . . . . . . . . . . . . . 6 72 7.2. Informative References . . . . . . . . . . . . . . . . . 7 73 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7 75 1. Introduction 77 The requirements for Lock Instruct (LI) and Loopback (LB) in 78 Multiprotocol Label Switching Transport Profile (MPLS-TP) are 79 specified in [RFC5860], and the framework of LI and LB is specified 80 in [RFC6371]. 82 In general the LI and LB are useful Operations, Administration and 83 Maintenance (OAM) functions for technologies which use Generalized 84 Multi-Protocol Label Switching (GMPLS) as control plane, e.g. time- 85 division multiplexing, wavelength-division multiplexing and packet 86 switching. It is natural to use and extend the GMPLS control plane 87 protocol to provide a unified approach for LI and LB provisioning in 88 all these technologies. 90 This document specifies extensions to Resource Reservation Protocol - 91 Traffic Engineering (RSVP-TE) to support lock instruct and loopback 92 mechanisms for Label Switched Paths (LSPs). The mechanisms are 93 applicable to technologies which use GMPLS as control plane. For 94 MPLS-TP network, the mechanisms defined in this document are 95 complementary to [RFC6435]. 97 2. Extensions to RSVP-TE 99 The A (Administratively down) bit in ADMIN_STATUS object [RFC3471] 100 [RFC3473] is used to indicate the lock/unlock of the LSP. Format of 101 ADMIN_STATUS Object is as below: 103 0 1 2 3 104 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 1 105 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 106 | Length | Class-Num(196)| C-Type (1) | 107 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 108 |R| Reserved |H|L|I|C|T|A|D| 109 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 111 Reflect (R): 1 bit - see [RFC3471] 112 Handover (H): 1 bit - see [RFC5852] 113 Lockout (L): 1 bit - see [RFC4872] 114 Inhibit Alarm Indication (I): 1 bit - see [RFC4783] 115 Call Control (C): 1 bit - see [RFC4974] 116 Testing (T): 1 bit - see [RFC3471] 117 Administratively down (A): 1 bit - see [RFC3471], reused for Lock 118 Deletion in progress (D): 1 bit - see [RFC3471] 120 A new bit is defined in Attribute Flags TLV [RFC5420] to indicate the 121 loopback mode. The bit number is TBA. 123 Bit Number Name and Usage 124 TBA Loopback mode desired. 125 This flag indicates a particular node on the LSP is required 126 to enter loopback mode. 127 This MAY also be used for specifying the loopback state 128 of the node. 130 3. Operations 132 3.1. Lock Instruct 134 When an ingress LSR intends to put an LSP into lock mode, it MUST 135 send a Path message with the Administratively down (A) bit and the 136 Reflect (R) bit in ADMIN_STATUS Object set. The intermediate nodes 137 SHOULD forward the message with the A bit unchanged to the downstream 138 . 140 On receipt of this Path message, the egress LSR SHOULD try to take 141 the LSP out of service. If the egress Label Switching Router (LSR) 142 locks the LSP successfully, it SHOULD send a Resv message with the A 143 bit in ADMIN_STATUS object set. Otherwise, it SHOULD send a PathErr 144 message with the Error Code "OAM Problem" 145 [I-D.ietf-ccamp-oam-configuration-fwk] and the new Error Value "Lock 146 Failure", and the following Resv messages SHOULD be sent with the A 147 bit cleared. With this procedure, the intermediate nodes would also 148 be aware of whether the LSP is in Lock mode or not. 150 When an LSP is put in lock mode, the subsequent Path and Resv 151 messages SHOULD keep the A bit in ADMIN_STATUS Object set. 153 When the ingress LSR intends to take the LSP out of the lock mode, it 154 MUST send a Path message with the A bit in ADMIN_STATUS Object 155 cleared. The intermediate nodes SHOULD forward this message with the 156 A bit unchanged to the downstream. 158 On receipt of this Path message, the egress LSR SHOULD try to bring 159 the LSP back to service. If the egress LSR unlocks the LSP 160 successfully, it SHOULD send a Resv message with the A bit in 161 ADMIN_STATUS Object cleared. Otherwise, it SHOULD send a PathErr 162 message with the Error Code "OAM Problem" 163 [I-D.ietf-ccamp-oam-configuration-fwk] and the new Error Value 164 "Unlock Failure", and the following Resv messages SHOULD be sent with 165 the A bit set. 167 When an LSP is taken out of lock mode, the subsequent Path and Resv 168 messages SHOULD keep the A bit in ADMIN_STATUS Object cleared. 170 3.2. Loopback 172 The loopback request can be sent either to the egress LSR or to a 173 particular intermediate node. The mechanism defined in 174 [I-D.ietf-ccamp-lsp-attribute-ro] is used for addressing the loopback 175 request to a particular node on the LSP. The loopback request is 176 acceptable only when the LSP is in lock mode. 178 When a ingress LSR intends to put a particular LSR on the LSP into 179 loopback mode, it MUST send a Path message with the Loopback bit in 180 the Attribute Flags TLV set. The mechanism defined in 181 [I-D.ietf-ccamp-lsp-attribute-ro] is used to address the loopback 182 request to the particular LSR. The Administratively down (A) bit in 183 ADMIN_STATUS object SHOULD be set to keep the LSP in lock mode. 185 On receipt of this Path message, the target LSR of the loopback 186 request SHOULD try to put the LSP into loopback mode. If the node 187 puts the LSP into loopback mode successfully, it SHOULD set the 188 Loopback (B) bit in the Record Route Object (RRO) Attribute subobject 189 [RFC5420] and push this subobject onto the RRO object in the 190 corresponding Resv message. The Administratively down (A) bit in 191 ADMIN_STATUS object SHOULD also be set in the Resv message. If the 192 node cannot put the LSP into loopback mode, it SHOULD send a PathErr 193 message with the Error Code "OAM Problem" 194 [I-D.ietf-ccamp-oam-configuration-fwk] and the new Error Value 195 "Loopback Failure". 197 When the ingress LSR intends to take the LSP out of loopback mode, it 198 MUST send a Path message with the Loopback (B) bit in the Attribute 199 Flags TLV cleared. The mechanism defined in 200 [I-D.ietf-ccamp-lsp-attribute-ro] is used to indicate that the 201 particular LSR SHOULD exit loopback mode for this LSP. The 202 Administratively down (A) bit in ADMIN_STATUS object SHOULD be set. 204 On receipt of this Path message, the target LSR SHOULD try to take 205 the LSP out of loopback mode. If the node takes the LSP out of 206 loopback mode successfully, it SHOULD clear the Loopback (B) Bit in 207 the RRO Attribute subobject and push this subobject onto the RRO 208 object in the corresponding Resv message. The Administratively down 209 (A) Bit in ADMIN_STATUS Object SHOULD be set. Otherwise, the node 210 SHOULD send a PathErr message with the Error Code "OAM Problem" 211 [I-D.ietf-ccamp-oam-configuration-fwk] and the new Error Value "Exit 212 Loopback Failure". 214 4. IANA Considerations 216 One bit number "Loopback" needs to be assigned in the Attribute Flags 217 registry. 219 Four new Error Values need to be allocated for "OAM Problem" Error 220 Code: 222 Value Error 223 TBA Lock Failure 224 TBA Unlock Failure 225 TBA Loopback Failure 226 TBA Exit Loopback Failure 228 5. Security Considerations 230 This document does not introduce any new security issues above those 231 identified in [RFC3209] and [RFC3473]. 233 6. Acknowledgements 235 The authors would like to thank Greg Mirsky, Lou Berger and Francesco 236 Fondelli for their comments and suggestions. 238 7. References 240 7.1. Normative References 242 [I-D.ietf-ccamp-lsp-attribute-ro] 243 Margaria, C., Martinelli, G., Balls, S., and B. Wright, 244 "LSP Attribute in ERO", draft-ietf-ccamp-lsp-attribute- 245 ro-03 (work in progress), February 2014. 247 [I-D.ietf-ccamp-oam-configuration-fwk] 248 Takacs, A., Fedyk, D., and H. Jia, "GMPLS RSVP-TE 249 extensions for OAM Configuration", draft-ietf-ccamp-oam- 250 configuration-fwk-13 (work in progress), February 2014. 252 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 253 Requirement Levels", BCP 14, RFC 2119, March 1997. 255 [RFC3209] Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V., 256 and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP 257 Tunnels", RFC 3209, December 2001. 259 [RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching 260 (GMPLS) Signaling Functional Description", RFC 3471, 261 January 2003. 263 [RFC3473] Berger, L., "Generalized Multi-Protocol Label Switching 264 (GMPLS) Signaling Resource ReserVation Protocol-Traffic 265 Engineering (RSVP-TE) Extensions", RFC 3473, January 2003. 267 [RFC3945] Mannie, E., "Generalized Multi-Protocol Label Switching 268 (GMPLS) Architecture", RFC 3945, October 2004. 270 [RFC5420] Farrel, A., Papadimitriou, D., Vasseur, JP., and A. 271 Ayyangarps, "Encoding of Attributes for MPLS LSP 272 Establishment Using Resource Reservation Protocol Traffic 273 Engineering (RSVP-TE)", RFC 5420, February 2009. 275 [RFC5860] Vigoureux, M., Ward, D., and M. Betts, "Requirements for 276 Operations, Administration, and Maintenance (OAM) in MPLS 277 Transport Networks", RFC 5860, May 2010. 279 [RFC6371] Busi, I. and D. Allan, "Operations, Administration, and 280 Maintenance Framework for MPLS-Based Transport Networks", 281 RFC 6371, September 2011. 283 7.2. Informative References 285 [I-D.ietf-ccamp-rsvp-te-mpls-tp-oam-ext] 286 Bellagamba, E., Andersson, L., Skoldstrom, P., Ward, D., 287 and A. Takacs, "Configuration of Pro-Active Operations, 288 Administration, and Maintenance (OAM) Functions for MPLS- 289 based Transport Networks using RSVP-TE", draft-ietf-ccamp- 290 rsvp-te-mpls-tp-oam-ext-12 (work in progress), June 2013. 292 [RFC6435] Boutros, S., Sivabalan, S., Aggarwal, R., Vigoureux, M., 293 and X. Dai, "MPLS Transport Profile Lock Instruct and 294 Loopback Functions", RFC 6435, November 2011. 296 Authors' Addresses 298 Jie Dong 299 Huawei Technologies 300 Huawei Campus, No.156 Beiqing Rd. 301 Beijing 100095 302 China 304 Email: jie.dong@huawei.com 306 Mach(Guoyi) Chen 307 Huawei Technologies 308 Huawei Campus, No.156 Beiqing Rd. 309 Beijing 100095 310 China 312 Email: mach.chen@huawei.com 314 Zhenqiang Li 315 China Mobile 316 Unit2, Dacheng Plaza, No. 28 Xuanwumenxi Ave. 317 Beijing 100053 318 China 320 Email: lizhenqiang@chinamobile.com 321 Daniele Ceccarelli 322 Ericsson 323 Via A. Negrone 1/A 324 Genova - Sestri Ponente 325 Italy 327 Email: daniele.ceccarelli@ericsson.com