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 | |||
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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. |
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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 Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. 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 Decraene, et al. Expires August 30, 2018 [Page 2] Internet-Draft SPF back-off algorithm February 2018 1. IntroductionShow full document text