IS-IS Topology-Transparent Zone
draft-ietf-lsr-isis-ttz-02
Internet Engineering Task Force H. Chen
Internet-Draft R. Li
Intended status: Experimental Futurewei
Expires: August 25, 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
February 21, 2021
IS-IS Topology-Transparent Zone
draft-ietf-lsr-isis-ttz-02.txt
Abstract
This document specifies a topology-transparent zone in an IS-IS 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 August 25, 2021 [Page 1]
Internet-Draft IS-IS TTZ February 2021
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 August 25, 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Zone Abstraction . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Node Abstraction Model . . . . . . . . . . . . . . . . . 5
3.2. Mesh Abstraction Model . . . . . . . . . . . . . . . . . 6
4. Topology-Transparent Zone . . . . . . . . . . . . . . . . . . 6
4.1. Zone as a Single Node . . . . . . . . . . . . . . . . . . 6
4.1.1. An Example of Zone as a Single Node . . . . . . . . . 7
4.1.2. Zone Leader Election . . . . . . . . . . . . . . . . 9
4.1.3. LS Generation for Zone as a Single Node . . . . . . . 10
4.1.4. Adjacency Establishment . . . . . . . . . . . . . . . 10
4.1.5. Computation of Routes . . . . . . . . . . . . . . . . 11
4.2. Extensions to Protocols . . . . . . . . . . . . . . . . . 12
4.2.1. Zone ID TLV . . . . . . . . . . . . . . . . . . . . . 12
4.3. Zone as Edges Full Mesh . . . . . . . . . . . . . . . . . 14
4.3.1. An Example of Zone as Edges Full Mesh . . . . . . . . 14
4.3.2. Updating LSPs for Zone as Edges Full Mesh . . . . . . 15
4.3.3. Computation of Routes . . . . . . . . . . . . . . . . 16
4.4. Advertisement of LSPs . . . . . . . . . . . . . . . . . . 16
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