Distribution of Traffic Engineering Extended Administrative Groups using BGP-LS
draft-ietf-idr-eag-distribution-16

IDR Working Group                                            J. Tantsura
Internet-Draft                                          Juniper Networks
Intended status: Standards Track                                 Z. Wang
Expires: October 20, 2021                                          Q. Wu
                                                                  Huawei
                                                           K. Talaulikar
                                                           Cisco Systems
                                                          April 18, 2021

Distribution of Traffic Engineering Extended Administrative Groups using
                                 BGP-LS
                   draft-ietf-idr-eag-distribution-16

Abstract

   Administrative groups are link attributes advertised used for traffic
   engineering.  This document defines an extension to BGP-LS for
   advertisement of extended administrative groups (EAGs).

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on October 20, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Tantsura, et al.        Expires October 20, 2021                [Page 1]
Internet-Draft        Extended Administrative Group           April 2021

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Advertising Extended Administrative Group in BGP-LS . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Administrative groups (commonly referred to as "colors" or "link
   colors") are link attributes that are advertised by link state
   protocols like IS-IS [RFC1195], OSPFv2 [RFC2328] and OSPFv3
   [RFC5340].  The BGP-LS advertisement of the originally defined (non-
   extended) administrative groups is encoded using the Administrative
   Group (color) TLV 1088 as defined in [RFC7752].

   These administrative groups are defined as a fixed-length 32-bit
   bitmask.  As networks grew and more use-cases were introduced, the
   32-bit length was found to be constraining and hence extended
   administrative groups (EAG) were introduced in [RFC7308].

   This document specifies an extension to BGP-LS for advertisement of
   the extended administrative groups.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  Advertising Extended Administrative Group in BGP-LS

   This document defines an extension that enable BGP-LS speakers to
   signal the EAG of links in a network to a BGP-LS consumer of network
   topology such as a centralized controller.  The centralized
   controller can leverage this information in traffic engineering

Tantsura, et al.        Expires October 20, 2021                [Page 2]
Internet-Draft        Extended Administrative Group           April 2021

   computations and other use-cases.  When a BGP-LS speaker is
   originating the topology learnt via link-state routing protocols like
   OSPF or IS-IS, the EAG information of the links is sourced from the
   underlying extensions as defined in [RFC7308].

   The EAG of a link is encoded in a new Link Attribute TLV [RFC7752]
   using the following format:

      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            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    Extended Administrative Group (variable)                 //
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

            Figure 1: Extended Administrative Group TLV Format

   Where:

   o  Type: 1173

   o  Length: variable length which represents the total length of the
      value field in octets.  The length value MUST be multiple of 4.
      If the length is not a multiple of 4, the TLV MUST be considered
      malformed.

   o  Value: one or more sets of 32-bit bitmasks that indicate the
      administrative groups (colors) that are enabled on the link when
      those specific bits are set.

3.  IANA Considerations

   This document requests assigning a code-point from the registry "BGP-
   LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute
   TLVs" based on table below.  Early allocation for these code-points
   have been done by IANA.

    +------------+-------------------------------+-------------------+
    | Code Point |   Description                 | IS-IS TLV/Sub-TLV |
    +------------+-------------------------------+-------------------+
    |   1173     | Extended Administrative Group |      22/14        |
    +------------+-------------------------------+-------------------+

Tantsura, et al.        Expires October 20, 2021                [Page 3]
Internet-Draft        Extended Administrative Group           April 2021

4.  Security Considerations

   The procedures and protocol extensions defined in this document do
   not affect the BGP security model.  See the "Security Considerations"
   section of [RFC4271] for a discussion of BGP security.  Also, refer
   to [RFC4272] and [RFC6952] for analyses of security issues for BGP.
   Security considerations for acquiring and distributing BGP-LS
   information are discussed in [RFC7752].  The TLV introduced in this
   document is used to propagate the EAG extensions defined in
   [RFC7308].  It is assumed that the IGP instances originating this TLV
   will support all the required security (as described in [RFC7308]) in
   order to prevent any security issues when propagating the TLVs into
   BGP-LS.  The advertisement of the link attribute information defined
   in this document presents no significant additional risk beyond that
   associated with the existing link attribute information already
   supported in [RFC7752].

5.  Acknowledgments

   The authors would like to thank Eric Osborne, Les Ginsberg, Tim
   Chown, Ben Niven-Jenkins and Alvaro Retana for their reviews and
   valuable comments.

6.  References

6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC7308]  Osborne, E., "Extended Administrative Groups in MPLS
              Traffic Engineering (MPLS-TE)", RFC 7308,
              DOI 10.17487/RFC7308, July 2014,
              <https://www.rfc-editor.org/info/rfc7308>.

   [RFC7752]  Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and
              S. Ray, "North-Bound Distribution of Link-State and
              Traffic Engineering (TE) Information Using BGP", RFC 7752,
              DOI 10.17487/RFC7752, March 2016,
              <https://www.rfc-editor.org/info/rfc7752>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

Tantsura, et al.        Expires October 20, 2021                [Page 4]
Internet-Draft        Extended Administrative Group           April 2021

6.2.  Informative References

   [RFC1195]  Callon, R., "Use of OSI IS-IS for routing in TCP/IP and
              dual environments", RFC 1195, DOI 10.17487/RFC1195,
              December 1990, <https://www.rfc-editor.org/info/rfc1195>.

   [RFC2328]  Moy, J., "OSPF Version 2", STD 54, RFC 2328,
              DOI 10.17487/RFC2328, April 1998,
              <https://www.rfc-editor.org/info/rfc2328>.

   [RFC4271]  Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
              Border Gateway Protocol 4 (BGP-4)", RFC 4271,
              DOI 10.17487/RFC4271, January 2006,
              <https://www.rfc-editor.org/info/rfc4271>.

   [RFC4272]  Murphy, S., "BGP Security Vulnerabilities Analysis",
              RFC 4272, DOI 10.17487/RFC4272, January 2006,
              <https://www.rfc-editor.org/info/rfc4272>.

   [RFC5340]  Coltun, R., Ferguson, D., Moy, J., and A. Lindem, "OSPF
              for IPv6", RFC 5340, DOI 10.17487/RFC5340, July 2008,
              <https://www.rfc-editor.org/info/rfc5340>.

   [RFC6952]  Jethanandani, M., Patel, K., and L. Zheng, "Analysis of
              BGP, LDP, PCEP, and MSDP Issues According to the Keying
              and Authentication for Routing Protocols (KARP) Design
              Guide", RFC 6952, DOI 10.17487/RFC6952, May 2013,
              <https://www.rfc-editor.org/info/rfc6952>.

Authors' Addresses

   Jeff Tantsura
   Juniper Networks

   Email: jefftant.ietf@gmail.com

   Zitao Wang
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: wangzitao@huawei.com

Tantsura, et al.        Expires October 20, 2021                [Page 5]
Internet-Draft        Extended Administrative Group           April 2021

   Qin Wu
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: bill.wu@huawei.com

   Ketan Talaulikar
   Cisco Systems

   Email: ketant@cisco.com

Tantsura, et al.        Expires October 20, 2021                [Page 6]