Loop avoidance using Segment Routing
draft-bashandy-rtgwg-segment-routing-uloop-06
Network Working Group Ahmed Bashandy
Internet Draft Individual
Intended status: Standards Track Clarence Filsfils
Expires: January 2020 Cisco Systems, Inc.
Stephane Litkowski
Bruno Decraene
Orange
Pierre Francois
INSA Lyon
Peter Psenak
Cisco Systems
July 6, 2019
Loop avoidance using Segment Routing
draft-bashandy-rtgwg-segment-routing-uloop-06
Abstract
This document presents a mechanism aimed at providing loop avoidance
in the case of IGP network convergence event. The solution relies on
the temporary use of SR policies ensuring loop-freeness over the
post-convergence paths from the converging node to the destination.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s)
controlling the copyright in such materials, this document may not
be modified outside the IETF Standards Process, and derivative
works of it may not be created outside the IETF Standards Process,
except to format it for publication as an RFC or to translate it
into languages other than English.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
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
Bashandy Expires January 6, 2020 [Page 1]
Internet-Draft SR Loop Avoidance July 2019
as reference material or to cite them other than as "work in
progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on January 6, 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
Provisions Relating to IETF Documents
(http://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...................................................2
1.1. Conventions used in this document.........................4
2. Loop-free two-stage convergence process........................4
3. Computing loop-avoiding SR policies............................5
4. Analysis.......................................................5
4.1. Incremental Deployment....................................5
4.2. No impact on capacity planning............................5
5. Security Considerations........................................6
6. IANA Considerations............................................6
7. Contributors...................................................6
8. References.....................................................6
8.1. Normative References......................................6
8.2. Informative References....................................6
9. Acknowledgments................................................6
1. Introduction
Forwarding loops happen during the convergence of the IGP, as a
result of transient inconsistency among forwarding states of the
nodes of the network.
Bashandy Expires January 6, 2020 [Page 2]
Internet-Draft SR Loop Avoidance July 2019
Show full document text