ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and GMPLS Traffic Engineering
draft-chen-lsr-isis-rfc5316bis-00

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Last updated 2019-06-06
Replaces draft-chen-isis-rfc5316bis
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Internet Engineering Task Force                                  M. Chen
Internet-Draft                                                    Huawei
Obsoletes: 5316 (if approved)                                L. Ginsberg
Intended status: Standards Track                           Cisco Systems
Expires: December 8, 2019                                     S. Previdi
                                                                  Huawei
                                                             D. Xiaodong
                                                            China Mobile
                                                            June 6, 2019

  ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and
                       GMPLS Traffic Engineering
                   draft-chen-lsr-isis-rfc5316bis-00

Abstract

   This document describes extensions to the Intermediate System to
   Intermediate System (IS-IS) protocol to support Multiprotocol Label
   Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering
   (TE) for multiple Autonomous Systems (ASs).  It defines IS-IS
   extensions for the flooding of TE information about inter-AS links,
   which can be used to perform inter-AS TE path computation.

   No support for flooding information from within one AS to another AS
   is proposed or defined in this document.

   This document obsoletes RFC 5316.

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.

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/.

Chen, et al.            Expires December 8, 2019                [Page 1]
Internet-Draft       ISIS Extensions for Inter-AS TE           June 2019

   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
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   This Internet-Draft will expire on December 8, 2019.

Copyright Notice

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  A Note on Non-Objectives  . . . . . . . . . . . . . . . .   4
     2.2.  Per-Domain Path Determination . . . . . . . . . . . . . .   5
     2.3.  Backward Recursive Path Computation . . . . . . . . . . .   6
   3.  Extensions to ISIS-TE . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Inter-AS Reachability TLV . . . . . . . . . . . . . . . .   8
     3.2.  TE Router ID  . . . . . . . . . . . . . . . . . . . . . .   9
     3.3.  Sub-TLVs for Inter-AS Reachability TLV  . . . . . . . . .  10
       3.3.1.  Remote AS Number Sub-TLV  . . . . . . . . . . . . . .  10
       3.3.2.  IPv4 Remote ASBR ID Sub-TLV . . . . . . . . . . . . .  10
       3.3.3.  IPv6 Remote ASBR ID Sub-TLV . . . . . . . . . . . . .  11
       3.3.4.  IPv6 Local ASBR ID sub-TLV  . . . . . . . . . . . . .  12
     3.4.  Sub-TLVs for IS-IS Router Capability TLV  . . . . . . . .  13
       3.4.1.  IPv4 TE Router ID sub-TLV . . . . . . . . . . . . . .  13
       3.4.2.  IPv6 TE Router ID sub-TLV . . . . . . . . . . . . . .  13
   4.  Procedure for Inter-AS TE Links . . . . . . . . . . . . . . .  14
     4.1.  Origin of Proxied TE Information  . . . . . . . . . . . .  15
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     6.1.  Inter-AS Reachability TLV . . . . . . . . . . . . . . . .  16
     6.2.  Sub-TLVs for the Inter-AS Reachability TLV  . . . . . . .  17
     6.3.  Sub-TLVs for the IS-IS Router Capability TLV  . . . . . .  17
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