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Tantsura 6 Nuage Networks 7 March 19, 2018 9 Distribution of MPLS-TE Extended admin Group Using BGP 10 draft-ietf-idr-eag-distribution-06 12 Abstract 14 As MPLS-TE network grows, administrative Groups advertised as a 15 fixed-length 32-bit Bitmask is quite constraining. "Extended 16 Administrative Group" IGP TE extensions sub-TLV is introduced to 17 provide for additional administrative groups (link colors) beyond the 18 current limit of 32. This document describes extensions to BGP 19 protocol, that can be used to distribute extended administrative 20 groups in MPLS-TE. 22 Status of This Memo 24 This Internet-Draft is submitted in full conformance with the 25 provisions of BCP 78 and BCP 79. 27 Internet-Drafts are working documents of the Internet Engineering 28 Task Force (IETF). Note that other groups may also distribute 29 working documents as Internet-Drafts. The list of current Internet- 30 Drafts is at https://datatracker.ietf.org/drafts/current/. 32 Internet-Drafts are draft documents valid for a maximum of six months 33 and may be updated, replaced, or obsoleted by other documents at any 34 time. It is inappropriate to use Internet-Drafts as reference 35 material or to cite them other than as "work in progress." 37 This Internet-Draft will expire on September 20, 2018. 39 Copyright Notice 41 Copyright (c) 2018 IETF Trust and the persons identified as the 42 document authors. All rights reserved. 44 This document is subject to BCP 78 and the IETF Trust's Legal 45 Provisions Relating to IETF Documents 46 (https://trustee.ietf.org/license-info) in effect on the date of 47 publication of this document. Please review these documents 48 carefully, as they describe your rights and restrictions with respect 49 to this document. Code Components extracted from this document must 50 include Simplified BSD License text as described in Section 4.e of 51 the Trust Legal Provisions and are provided without warranty as 52 described in the Simplified BSD License. 54 Table of Contents 56 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 57 2. Conventions used in this document . . . . . . . . . . . . . . 2 58 3. Carrying Extended Administrative Groups in BGP . . . . . . . 2 59 3.1. AG and EAG coexistence . . . . . . . . . . . . . . . . . 3 60 3.2. Desire for unadvertised EAG bits . . . . . . . . . . . . 3 61 4. Security Considerations . . . . . . . . . . . . . . . . . . . 4 62 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 63 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4 64 7. Normative References . . . . . . . . . . . . . . . . . . . . 4 65 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 67 1. Introduction 69 MPLS-TE advertises 32 administrative groups (commonly referred to as 70 "colors" or "link colors") using the Administrative Group sub-TLV of 71 the Link TLV defined in OSPFv2 (RFC3630), OSPFv3 (RFC5329) and ISIS 72 (RFC5305). 74 As MPLS-TE network grows, administrative Groups advertised as a 75 fixed-length 32-bit Bitmask is quite constraining. "Extended 76 Administrative Group" IGP TE extensions sub-TLV defined in [RFC7308] 77 is introduced to provide for additional administrative groups (link 78 colors) beyond the current limit of 32. 80 This document proposes new BGP Link attribute TLVs that can be 81 announced as attribute in the BGP-LS attribute (defined in [I.D-ietf- 82 idr-ls-distribution]) to distribute extended administrative groups in 83 MPLS-TE. 85 2. Conventions used in this document 87 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 88 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 89 document are to be interpreted as described in RFC2119 [RFC2119]. 91 3. Carrying Extended Administrative Groups in BGP 93 This document proposes one new BGP link attribute TLVs that can be 94 announced as attribute in the BGP-LS attribute (defined in [I.D-ietf- 95 idr-ls-distribution]) to distribute extended administrative groups. 97 The extensions in this document build on the ones provided in BGP-LS 98 [RFC7752] and BGP-4 [RFC4271]. 100 BGP-LS attribute defined in [RFC7752] has nested TLVs which allow the 101 BGP-LS attribute to be readily extended. Link attribute TLVs defined 102 in section 3.2.2 of [I-D.ietf-idr-ls-distribution]are TLVs that may 103 be encoded in the BGP-LS attribute with a link NLRI. Each 'Link 104 Attribute' is a Type/Length/ Value (TLV) triplet formatted as defined 105 in Section 3.1 of [I-D.ietf-idr-ls-distribution]. 107 This document proposes one new TLV as a link attribute: 109 Type Value 111 TBD1 Extended Administrative Group (EAG) 113 The EAG TLV is used in addition to the Administrative Groups when a 114 node wants to advertise more than 32 colors for a link. The EAG TLV 115 is optional. The format and semantics of the 'value' fields in EAG 116 TLVs correspond to the format and semantics of value fields in IGP 117 extension sub-TLVs, defined in [RFC7308]. 119 +------------+---------------------+--------------+-----------------+ 120 | TLV Code | Description | IS-IS | Defined in: | 121 | Point | | TLV/Sub-TLV | | 122 +------------+---------------------+--------------+-----------------+ 123 | TBD1 | Extended | 22/14 | [RFC7308] | 124 | |Admininstrative Group| | | 125 +------------+---------------------+--------------+-----------------+ 127 Table 1: 'EAG' Link Attribute TLV 129 3.1. AG and EAG coexistence 131 Similar to section 2.3.1 of [RFC7308],if a BGP speaker advertises 132 both AG and EAG then AG and EAG should be dealt with in the same way 133 as AG and EAG carried in the Extended Administrative Group (EAG) sub- 134 TLV [RFC7308] for both OSPF [RFC3630] and ISIS [RFC5305]. 136 3.2. Desire for unadvertised EAG bits 138 Unlike AGs, EAGs are advertised as any non-zero-length-bit Bitmask. 139 the EAG length may be longer for some links than for others. Similar 140 to section 2.3.2 of [RFC7308], if a BGP peer wants to only use links 141 where the specific bits of an EAG is set to 1 but the specific bits 142 of this EAG is not advertised, then the implementation SHOULD process 143 these desire and unadvertised EAG bits in accordance with rule 144 defined in section 2.3.2 of [RFC7308]. 146 4. Security Considerations 148 This document does not introduce security issues beyond those 149 discussed in [RFC7752] and [RFC4271]. 151 5. IANA Considerations 153 This document requests assigning code-points from the registry "BGP- 154 LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute 155 TLVs" for the new Link Attribute TLVs defined in the table above: 157 6. Acknowledgments 159 The authors gratefully acknowledge the review made by Eric Osborne. 161 7. Normative References 163 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 164 Requirement Levels", March 1997. 166 [RFC3630] Katz, D., Yeung, D., and K. Kompella, "Traffic Engineering 167 (TE) Extensions to OSPF Version 2", RFC 3630, September 168 2003. 170 [RFC4271] Rekhter, Y., "A Border Gateway Protocol 4 (BGP-4)", 171 RFC 4271, January 2006. 173 [RFC5305] Li, T. and H. Smit, "IS-IS Extensions for Traffic 174 Engineering", RFC 5305, October 2008. 176 [RFC7308] Osborne, E., "Extended Administrative Groups in MPLS-TE", 177 ID RFC7308, July 2014. 179 [RFC7752] Gredler, H., "North-Bound Distribution of Link-State and 180 TE Information using BGP", RFC 7752, March 2016. 182 Authors' Addresses 184 Zitao Wang 185 Huawei 186 101 Software Avenue, Yuhua District 187 Nanjing, Jiangsu 210012 188 China 190 Email: wangzitao@huawei.com 191 Qin Wu 192 Huawei 193 101 Software Avenue, Yuhua District 194 Nanjing, Jiangsu 210012 195 China 197 Email: bill.wu@huawei.com 199 Jeff Tantsura 200 Nuage Networks 202 Email: jefftant.ietf@gmail.com