Topology-Transparent Zone
draft-chen-isis-ttz-07
Internet Engineering Task Force H. Chen
Internet-Draft A. Retana
Intended status: Standards Track R. Li
Expires: April 11, 2020 Futurewei
A. Kumar S N
RtBrick
N. So
V. Liu
M. Toy
Verizon
L. Liu
Fijitsu
October 9, 2019
Topology-Transparent Zone
draft-chen-isis-ttz-07.txt
Abstract
This document presents a topology-transparent zone in an area. A
zone is a 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 pseudo node or zone edges mess. 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 to IETF 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-
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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 April 11, 2020.
Chen, et al. Expires April 11, 2020 [Page 1]
Internet-Draft TTZ October 2019
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
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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 . . . . . . . . . . . . . . . . . . . . . . 4
4. Topology-Transparent Zone . . . . . . . . . . . . . . . . . . 5
4.1. Zone as a Single Pseudo 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 . . . . . . . 7
4.1.4. Adjacency Establishment . . . . . . . . . . . . . . . 8
4.1.5. Computation of Routes . . . . . . . . . . . . . . . . 10
4.1.6. Extensions to Protocols . . . . . . . . . . . . . . . 10
4.2. Zone as Edges Full Mess . . . . . . . . . . . . . . . . . 12
4.2.1. Extensions to IS-IS . . . . . . . . . . . . . . . . . 13
4.3. Advertisement of LSs . . . . . . . . . . . . . . . . . . 15
4.3.1. Advertisement of LSs within Zone . . . . . . . . . . 15
4.3.2. Advertisement of LSs through Zone . . . . . . . . . . 16
5. Seamless Migration . . . . . . . . . . . . . . . . . . . . . 16
5.1. Transfer zone to a Single Node . . . . . . . . . . . . . 16
5.2. Roll Back from Zone as a Single Node . . . . . . . . . . 17
6. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 19
7. Security Considerations . . . . . . . . . . . . . . . . . . 19
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
9. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 19
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.1. Normative References . . . . . . . . . . . . . . . . . . 19
10.2. Informative References . . . . . . . . . . . . . . . . . 20
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