SPF Back-off algorithm for link state IGPs
draft-ietf-rtgwg-backoff-algo-08
| The information below is for an old version of the document | |||
|---|---|---|---|
| Document | Type | Active Internet-Draft (rtgwg WG) | |
| Authors | Bruno Decraene , Stephane Litkowski , Hannes Gredler , Acee Lindem , Pierre Francois , Chris Bowers | ||
| Last updated | 2018-02-27 | ||
| Replaces | draft-decraene-rtgwg-backoff-algo | ||
| Stream | IETF | ||
| Intended RFC status | Proposed Standard | ||
| Formats | pdf htmlized (tools) htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Uma Chunduri | ||
| Shepherd write-up | Show (last changed 2018-01-22) | ||
| IESG | IESG state | IESG Evaluation::AD Followup | |
| Consensus Boilerplate | Yes | ||
| Telechat date |
Needs a YES. Needs 6 more YES or NO OBJECTION positions to pass. |
||
| Responsible AD | Alia Atlas | ||
| Send notices to | Uma Chunduri <uma.chunduri@huawei.com> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
Network Working Group B. Decraene
Internet-Draft Orange
Intended status: Standards Track S. Litkowski
Expires: August 30, 2018 Orange Business Service
H. Gredler
RtBrick Inc
A. Lindem
Cisco Systems
P. Francois
C. Bowers
Juniper Networks, Inc.
February 26, 2018
SPF Back-off algorithm for link state IGPs
draft-ietf-rtgwg-backoff-algo-08
Abstract
This document defines a standard algorithm to temporarily postpone or
'back-off' link-state IGP Shortest Path First (SPF) computations.
This reduces the computational load and churn on IGP nodes when
multiple temporally close network events trigger multiple SPF
computations.
Having one standard algorithm improves interoperability by reducing
the probability and/or duration of transient forwarding loops during
the IGP convergence when the IGP reacts to multiple temporally close
IGP events.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
[BCP14] [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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/.
Decraene, et al. Expires August 30, 2018 [Page 1]
Internet-Draft SPF back-off algorithm February 2018
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 August 30, 2018.
Copyright Notice
Copyright (c) 2018 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
2. High level goals . . . . . . . . . . . . . . . . . . . . . . 3
3. Definitions and parameters . . . . . . . . . . . . . . . . . 4
4. Principles of SPF delay algorithm . . . . . . . . . . . . . . 5
5. Specification of the SPF delay state machine . . . . . . . . 6
5.1. State Machine . . . . . . . . . . . . . . . . . . . . . . 6
5.2. State . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.3. Timers . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.4. FSM Events . . . . . . . . . . . . . . . . . . . . . . . 8
6. Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 10
7. Partial Deployment . . . . . . . . . . . . . . . . . . . . . 11
8. Impact on micro-loops . . . . . . . . . . . . . . . . . . . . 11
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
10. Security considerations . . . . . . . . . . . . . . . . . . . 11
11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
12.1. Normative References . . . . . . . . . . . . . . . . . . 12
12.2. Informative References . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13
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1. Introduction
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