IS-IS Topology-Transparent Zone
draft-ietf-lsr-isis-ttz-01
Internet Engineering Task Force H. Chen
Internet-Draft R. Li
Intended status: Experimental Futurewei
Expires: April 6, 2021 Y. Yang
IBM
A. Kumar S N
RtBrick
Y. Fan
Casa Systems
N. So
V. Liu
M. Toy
Verizon
L. Liu
Fujitsu
K. Makhijani
Futurewei
October 3, 2020
IS-IS Topology-Transparent Zone
draft-ietf-lsr-isis-ttz-01.txt
Abstract
This document specifies a topology-transparent zone in an area. A
zone is a subset (block/piece) of an area, which comprises a group of
routers and a number of circuits connecting them. It is abstracted
as a virtual entity such as a single virtual node or zone edges mesh.
Any router outside of the zone is not aware of the zone. The
information about the circuits and routers inside the zone is not
distributed to any router outside of the zone.
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/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Chen, et al. Expires April 6, 2021 [Page 1]
Internet-Draft IS-IS TTZ October 2020
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 April 6, 2021.
Copyright Notice
Copyright (c) 2020 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Zone Abstraction . . . . . . . . . . . . . . . . . . . . . . 5
4. Topology-Transparent Zone . . . . . . . . . . . . . . . . . . 5
4.1. Zone as a Single Node . . . . . . . . . . . . . . . . . . 5
4.1.1. An Example of Zone as a Single Node . . . . . . . . . 5
4.1.2. Zone Leader Election . . . . . . . . . . . . . . . . 7
4.1.3. LS Generation for Zone as a Single Node . . . . . . . 8
4.1.4. Adjacency Establishment . . . . . . . . . . . . . . . 8
4.1.5. Computation of Routes . . . . . . . . . . . . . . . . 9
4.2. Extensions to Protocols . . . . . . . . . . . . . . . . . 9
4.2.1. Zone ID TLV . . . . . . . . . . . . . . . . . . . . . 9
4.3. Zone as Edges Full Mesh . . . . . . . . . . . . . . . . . 11
4.3.1. Updating LSPs for Zone as Edges' Mesh . . . . . . . . 12
4.4. Advertisement of LSPs . . . . . . . . . . . . . . . . . . 12
4.4.1. Advertisement of LSPs within Zone . . . . . . . . . . 12
4.4.2. Advertisement of LSPs through Zone . . . . . . . . . 13
5. Seamless Migration . . . . . . . . . . . . . . . . . . . . . 13
5.1. Transfer Zone to a Single Node . . . . . . . . . . . . . 13
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