Advertising L2 Bundle Member Link Attributes in IS-IS
draft-ietf-isis-l2bundles-07

Document Type Active Internet-Draft (isis WG)
Last updated 2017-05-31 (latest revision 2017-05-25)
Replaces draft-ginsberg-isis-l2bundles
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Networking Working Group                                     L. Ginsberg
Internet-Draft                                               A. Bashandy
Intended status: Standards Track                             C. Filsfils
Expires: November 26, 2017                                 Cisco Systems
                                                              M. Nanduri
                                                                    eBay
                                                                E. Aries
                                                     Private Contributer
                                                            May 25, 2017

         Advertising L2 Bundle Member Link Attributes in IS-IS
                    draft-ietf-isis-l2bundles-07.txt

Abstract

   There are deployments where the Layer 3 interface on which IS-IS
   operates is a Layer 2 interface bundle.  Existing IS-IS
   advertisements only support advertising link attributes of the Layer
   3 interface.  If entities external to IS-IS wish to control traffic
   flows on the individual physical links which comprise the Layer 2
   interface bundle link attribute information about the bundle members
   is required.

   This document introduces the ability for IS-IS to advertise the link
   attributes of layer 2 (L2) bundle members.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

Ginsberg, et al.        Expires November 26, 2017               [Page 1]
Internet-Draft               isis-l2bundles                     May 2017

   This Internet-Draft will expire on November 26, 2017.

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  L2 Bundle Member Attributes TLV . . . . . . . . . . . . . . .   3
     2.1.  Parallel L3 Adjacencies . . . . . . . . . . . . . . . . .   5
     2.2.  Shared Attribute sub-TLVs . . . . . . . . . . . . . . . .   5
   3.  Advertising L2 Bundle Member Adj-SIDs . . . . . . . . . . . .   6
     3.1.  L2 Bundle Member Adjacency Segment Identifier sub-TLV . .   6
     3.2.  L2 Bundle Member LAN Adjacency Segment Identifier sub-TLV   7
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  11
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informational References  . . . . . . . . . . . . . . . .  13
   Appendix A.  Example Encoding . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   There are deployments where the Layer 3 interface on which an IS-IS
   adjacency is established is a Layer 2 interface bundle, for instance
   a Link Aggregation Group (LAG) [IEEE802.1AX].  This reduces the
   number of adjacencies which need to be maintained by the routing
   protocol in cases where there are parallel links between the
   neighbors.  Entities external to IS-IS such as Path Computation
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