ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and GMPLS Traffic Engineering
draft-ietf-lsr-isis-rfc5316bis-00
Internet Engineering Task Force M. Chen
Internet-Draft Huawei
Obsoletes: 5316 (if approved) L. Ginsberg
Intended status: Standards Track Cisco Systems
Expires: May 19, 2021 S. Previdi
Huawei Technologies
D. Xiaodong
China Mobile
November 15, 2020
ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and
GMPLS Traffic Engineering
draft-ietf-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 May 19, 2021 [Page 1]
Internet-Draft ISIS Extensions for Inter-AS TE November 2020
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 May 19, 2021.
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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 . . . . . . . . . . . . . . . . . . . 16
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
6.1. Inter-AS Reachability TLV . . . . . . . . . . . . . . . . 17
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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