Internet Engineering Task Force (IETF) D. Eastlake 3rd
Request for Comments: 7172 M. Zhang
Updates: 6325 Huawei
Category: Standards Track P. Agarwal
ISSN: 2070-1721 Broadcom
R. Perlman
Intel Labs
D. Dutt
Cumulus Networks
May 2014
Transparent Interconnection of Lots of Links (TRILL):
Fine-Grained Labeling
Abstract
The IETF has standardized Transparent Interconnection of Lots of
Links (TRILL), a protocol for least-cost transparent frame routing in
multi-hop networks with arbitrary topologies and link technologies,
using link-state routing and a hop count. The TRILL base protocol
standard supports the labeling of TRILL Data packets with up to 4K
IDs. However, there are applications that require a larger number of
labels providing configurable isolation of data. This document
updates RFC 6325 by specifying optional extensions to the TRILL base
protocol to safely accomplish this. These extensions, called fine-
grained labeling, are primarily intended for use in large data
centers, that is, those with more than 4K users requiring
configurable data isolation from each other.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7172.
Eastlake, et al. Standards Track [Page 1]RFC 7172 TRILL: Fine-Grained Labeling May 2014Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the
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Eastlake, et al. Standards Track [Page 2]RFC 7172 TRILL: Fine-Grained Labeling May 2014Table of Contents
1. Introduction ....................................................4
1.1. Terminology ................................................5
1.2. Contributors ...............................................5
2. Fine-Grained Labeling ...........................................5
2.1. Goals ......................................................6
2.2. Base Protocol TRILL Data Labeling ..........................7
2.3. Fine-Grained Labeling (FGL) ................................7
2.4. Reasons for VL and FGL Coexistence .........................9
3. VL versus FGL Label Differences ................................10
4. FGL Processing .................................................11
4.1. Ingress Processing ........................................11
4.1.1. Multi-Destination FGL Ingress ......................11
4.2. Transit Processing ........................................12
4.2.1. Unicast Transit Processing .........................12
4.2.2. Multi-Destination Transit Processing ...............12
4.3. Egress Processing .........................................13
4.4. Appointed Forwarders and the DRB ..........................14
4.5. Distribution Tree Construction ............................14
4.6. Address Learning ..........................................15
4.7. ESADI Extension ...........................................15
5. FGL TRILL Interaction with VL TRILL ............................15
5.1. FGL and VL Mixed Campus ...................................15
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