ISIS Extensions for Broadcast Inter-AS TE Link
draft-chen-isis-ias-lk-00

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ISIS Working Group                                               H. Chen
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                                  M. Toy
Expires: September 14, 2017                                      Verizon
                                                                  X. Liu
                                                                   Jabil
                                                                  L. Liu
                                                                 Fujitsu
                                                                   Z. Li
                                                            China Mobile
                                                                 Y. Yang
                                                                Sockrate
                                                          March 13, 2017

             ISIS Extensions for Broadcast Inter-AS TE Link
                       draft-chen-isis-ias-lk-00

Abstract

   This document presents extensions to the ISIS protocol for
   advertising broadcast inter-AS Traffic Engineering (TE) links.

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   This Internet-Draft will expire on September 14, 2017.

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   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
   (http://trustee.ietf.org/license-info) in effect on the date of

Chen, et al.           Expires September 14, 2017               [Page 1]
Internet-Draft              inter-as-te-link                  March 2017

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Information on Inter-AS TE Link . . . . . . . . . . . . . . .   3
   4.  Extensions to ISIS  . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  sub-TLVs  . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.2.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   4
       4.2.1.  ISIS Router Procedure . . . . . . . . . . . . . . . .   4
       4.2.2.  Super Node Procedure  . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Connections among different Autonomous Systems (ASes) may be point-
   to-point (P2P) links and broadcast links.  For a P2P inter-AS TE
   link, RFC 5316 defines a new TLV, the inter-AS reachability TLV, for
   advertising the link.

   It also defines three new sub-TLVs for inclusion in the inter-AS
   reachability TLV to carry the information about the neighboring AS
   number and the remote ASBR ID of an inter-AS link.

   For a P2P inter-AS link, the information about its remote ASBR may be
   configured.  For a broadcast inter-AS link, no item configured
   corresponds to the designated router (DR) of the link in ISIS.  Since
   no ISIS runs over any broadcast inter-AS link, no DR is selected.  It
   is hard to configure an item corresponding to the DR on a broadcast
   link.

   This document presents extensions to ISIS for advertising broadcast
   inter-AS TE links through defining a new sub-TLV for a broadcast link
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