TRILL: Resilient Distribution Trees
draft-ietf-trill-resilient-trees-08
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2017-06-09
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draft-zhang-trill-resilient-trees
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IETF
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Proposed Standard
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Donald Eastlake
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INTERNET-DRAFT Mingui Zhang
Intended Status: Proposed Standard Huawei
Updates: 6325 Tissa Senevirathne
Consultant
Janardhanan Pathangi
Gigamon
Ayan Banerjee
Cisco
Anoop Ghanwani
DELL
Expires: December 11, 2017 June 9, 2017
TRILL: Resilient Distribution Trees
draft-ietf-trill-resilient-trees-08.txt
Abstract
The TRILL (Transparent Interconnection of Lots of Links) protocol
provides multicast data forwarding based on IS-IS link state routing.
Distribution trees are computed based on the link state information
through Shortest Path First calculation. When a link on the
distribution tree fails, a campus-wide re-convergence of this
distribution tree will take place, which can be time consuming and
may cause considerable disruption to the ongoing multicast service.
This document specifies how to build backup distribution trees to
protect links on the primary distribution tree. Since the backup
distribution tree is built up ahead of the link failure, when a link
on the primary distribution tree fails, the pre-installed backup
forwarding table will be utilized to deliver multicast packets
without waiting for the campus-wide re-convergence. This minimizes
the service disruption. This document updates RFC 6325.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79.
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 as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
Zhang, et al. Expires December 11, 2017 [Page 1]
INTERNET-DRAFT Resilient Distribution Trees June 9, 2017
http://www.ietf.org/1id-abstracts.html
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
Copyright and License Notice
Copyright (c) 2017 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 . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Conventions used in this document . . . . . . . . . . . . . 5
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Usage of the Affinity Sub-TLV . . . . . . . . . . . . . . . . . 6
2.1. Allocating Affinity Links . . . . . . . . . . . . . . . . . 6
2.2. Distribution Tree Calculation with Affinity Links . . . . . 7
3. Resilient Distribution Trees Calculation . . . . . . . . . . . 8
3.1. Designating Roots for Backup Distribution Trees . . . . . . 8
3.2. Backup DT Calculation . . . . . . . . . . . . . . . . . . . 9
3.2.1. Backup DT Calculation with Affinity Links . . . . . . . 9
3.2.1.1. Algorithm for Choosing Affinity Links . . . . . . . 9
3.2.1.2. Affinity Links Advertisement . . . . . . . . . . . 10
4. Resilient Distribution Trees Installation . . . . . . . . . . . 10
4.1. Pruning the Backup Distribution Tree . . . . . . . . . . . 11
4.2. RPF Filters Preparation . . . . . . . . . . . . . . . . . . 11
5. Protection Mechanisms with Resilient Distribution Trees . . . . 12
5.1. Global 1:1 Protection . . . . . . . . . . . . . . . . . . . 13
5.2. Global 1+1 Protection . . . . . . . . . . . . . . . . . . . 13
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