Advertising L2 Bundle Member Link Attributes in IS-IS
draft-ietf-isis-l2bundles-00

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Last updated 2016-02-22
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Networking Working Group                                     L. Ginsberg
Internet-Draft                                               A. Bashandy
Intended status: Standards Track                             C. Filsfils
Expires: August 10, 2016                                      S. Previdi
                                                           Cisco Systems
                                                              M. Nanduri
                                                               Microsoft
                                                                E. Aries
                                                     Private Contributer
                                                        February 7, 2016

         Advertising L2 Bundle Member Link Attributes in IS-IS
                    draft-ietf-isis-l2bundles-00.txt

Abstract

   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].

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   This Internet-Draft will expire on August 10, 2016.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Ginsberg, et al.         Expires August 10, 2016                [Page 1]
Internet-Draft               isis-l2bundles                February 2016

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these 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 . . . . . . . . . . . .   5
     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.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     7.2.  Informational References  . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

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.  However, if there is still a desire to control traffic
   flows on individual physical links, information about each of the L2
   bundle members is required.  This document introduces a new TLV to
   advertise link attribute information for each of the L2 bundle
   members.

   [SR] introduces a new link attribute - adjacency segment identifier
   (Adj-SID) - which can be used as an instruction to forwarding to send
   traffic over a specific link.  This document introduces additional
   sub-TLVs to advertise Adj-SIDs for L2 Bundle members.

Ginsberg, et al.         Expires August 10, 2016                [Page 2]
Internet-Draft               isis-l2bundles                February 2016

2.  L2 Bundle Member Attributes TLV

   A new TLV is introduced to advertise L2 Bundle member attributes.
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