ISIS Extensions for Broadcast Inter-AS TE Link
draft-chen-isis-ias-lk-03
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ISIS Working Group H. Chen
Internet-Draft Futurewei
Intended status: Standards Track M. Toy
Expires: January 9, 2020 Verizon
X. Liu
Volta Networks
L. Liu
Fujitsu
Z. Li
China Mobile
Y. Yang
IBM
July 8, 2019
ISIS Extensions for Broadcast Inter-AS TE Link
draft-chen-isis-ias-lk-03
Abstract
This document presents extensions to the ISIS protocol for
advertising broadcast inter-AS Traffic Engineering (TE) links.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on January 9, 2020.
Copyright Notice
Copyright (c) 2019 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
(https://trustee.ietf.org/license-info) in effect on the date of
Chen, et al. Expires January 9, 2020 [Page 1]
Internet-Draft inter-as-te-link July 2019
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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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
without configuring any item corresponding to the DR on the link.
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