Topology Independent Fast Reroute using Segment Routing
draft-bashandy-rtgwg-segment-routing-ti-lfa-04
|
| Document |
Type |
|
Active Internet-Draft (individual)
|
|
Last updated |
|
2018-04-02
|
|
Replaces |
|
draft-francois-rtgwg-segment-routing-ti-lfa
|
|
Stream |
|
(None)
|
|
Intended RFC status |
|
(None)
|
|
Formats |
|
plain text
pdf
html
bibtex
|
|
Reviews |
|
|
| Stream |
Stream state |
|
(No stream defined) |
|
Consensus Boilerplate |
|
Unknown
|
|
RFC Editor Note |
|
(None)
|
| IESG |
IESG state |
|
I-D Exists
|
|
Telechat date |
|
|
|
Responsible AD |
|
(None)
|
|
Send notices to |
|
(None)
|
Network Working Group A. Bashandy
Internet Draft C. Filsfils
Intended status: Standard Track Cisco Systems
Expires: September 2018 Bruno Decraene
Stephane Litkowski
Orange
Pierre Francois
Individual Contributor
D. Voyer
Bell Canada
March 30, 2018
Topology Independent Fast Reroute using Segment Routing
draft-bashandy-rtgwg-segment-routing-ti-lfa-04
Abstract
This document presents Topology Independent Loop-free Alternate Fast
Re-route (TI-LFA), aimed at providing protection of node and
adjacency segments within the Segment Routing (SR) framework. This
Fast Re-route (FRR) behavior builds on proven IP-FRR concepts being
LFAs, remote LFAs (RLFA), and remote LFAs with directed forwarding
(DLFA). It extends these concepts to provide guaranteed coverage in
any IGP network. A key aspect of TI-LFA is the FRR path selection
approach establishing protection over post-convergence paths from
the point of local repair, dramatically reducing the operational
need to control the tie-breaks among various FRR options.
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
Bashandy Expires September 30, 2018 [Page 1]
Internet-Draft SR TI-LFA March 2018
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 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 September 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
(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...................................................3
1.1. Conventions used in this document.........................5
2. Terminology....................................................5
3. Intersecting P-Space and Q-Space with post-convergence paths...6
3.1. P-Space property computation for a resource X.............6
3.2. Q-Space property computation for a link S-F, over post-
convergence paths..............................................6
3.3. Q-Space property computation for a set of links adjacent to
S, over post-convergence paths.................................7
3.4. Q-Space property computation for a node F, over post-
convergence paths..............................................7
4. TI-LFA Repair Tunnel...........................................7
Show full document text