IGP for Network High Availability
draft-chen-lsr-ctr-availability-01
Network Working Group H. Chen
Internet-Draft Futurewei
Intended status: Standards Track M. Toy
Expires: March 13, 2021 Verizon
A. Wang
China Telecom
L. Liu
Fujitsu
X. Liu
Volta Networks
September 9, 2020
IGP for Network High Availability
draft-chen-lsr-ctr-availability-01
Abstract
This document describes protocol extensions to OSPF and IS-IS for
improving the reliability or availability of a network controlled by
a controller cluster.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
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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material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 13, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminologies . . . . . . . . . . . . . . . . . . . . . . . . 3
3. IGP for Controller Cluster Reliability . . . . . . . . . . . 3
3.1. Overview of Mechanism . . . . . . . . . . . . . . . . . . 3
3.2. Example . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Extensions to IGP . . . . . . . . . . . . . . . . . . . . . . 6
4.1. Extensions to OSPF . . . . . . . . . . . . . . . . . . . 6
4.2. Extensions to IS-IS . . . . . . . . . . . . . . . . . . . 8
5. Recovery Procedure . . . . . . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1. Normative References . . . . . . . . . . . . . . . . . . 11
9.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
More and more networks are controlled by central controllers or
controller clusters. A controller cluster is a single controller
externally. It normally consists of two or more controllers
internally working together to control a network, i.e., every network
element (NE) in the network. The reliability or availability of a
network is heavily dependent on its controller cluster. The issues
or failures in the controller cluster may impact the reliability or
availability of the network greatly.
For a controller cluster comprising two or more controllers (i.e.,
primary controller, secondary controller, and so on), the failures in
the cluster may split the cluster into a few of separated controller
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