Transparent Interconnection of Lots of Links (TRILL) Distributed Layer 3 Gateway
RFC 7956

Document Type RFC - Proposed Standard (September 2016; No errata)
Last updated 2018-12-20
Replaces draft-hao-trill-irb
Stream IETF
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IESG IESG state RFC 7956 (Proposed Standard)
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Internet Engineering Task Force (IETF)                            W. Hao
Request for Comments: 7956                                         Y. Li
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                                    A. Qu
                                                                MediaTec
                                                              M. Durrani
                                                            Equinix Inc.
                                                          P. Sivamurugan
                                                             IP Infusion
                                                          September 2016

          Transparent Interconnection of Lots of Links (TRILL)
                      Distributed Layer 3 Gateway

Abstract

   The base TRILL (Transparent Interconnection of Lots of Links)
   protocol provides optimal pair-wise data frame forwarding for Layer 2
   intra-subnet traffic but not for Layer 3 inter-subnet traffic.  A
   centralized gateway solution is typically used for Layer 3 inter-
   subnet traffic forwarding but has the following issues:

   1. Sub-optimum forwarding paths for inter-subnet traffic.

   2. A centralized gateway that may need to support a very large number
      of gateway interfaces in a Data Center, one per tenant per Data
      Label used by that tenant, to provide interconnect functionality
      for all the Layer 2 Virtual Networks in a TRILL campus.

   3. A traffic bottleneck at the gateway.

   This document specifies an optional TRILL distributed gateway
   solution that resolves these centralized gateway issues.

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 7841.

   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/rfc7956.

Hao, et al.                  Standards Track                    [Page 1]
RFC 7956            TRILL Distributed Layer 3 Gateway     September 2016

Copyright Notice

   Copyright (c) 2016 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. Document Organization ......................................3
   2. Conventions Used in This Document ...............................4
   3. Simplified Example and Problem Statement ........................5
      3.1. Simplified Example .........................................6
      3.2. Problem Statement Summary ..................................8
   4. Layer 3 Traffic Forwarding Model ................................9
   5. Distributed Gateway Solution Details ...........................10
      5.1. Local Routing Information .................................11
      5.2. Local Routing Information Synchronization .................12
      5.3. Active-Active Access ......................................14
      5.4. Data Traffic Forwarding Process ...........................15
   6. Distributed Layer 3 Gateway Process Example ....................16
      6.1. Control-Plane Process .....................................17
      6.2. Data-Plane Process ........................................19
   7. TRILL Protocol Extensions ......................................20
      7.1. The Tenant Label and Gateway MAC APPsub-TLV ...............20
      7.2. The SE Flag in the NickFlags APPsub-TLV ...................21
      7.3. The IPv4 Prefix APPsub-TLV ................................22
      7.4. The IPv6 Prefix APPsub-TLV ................................23
   8. Security Considerations ........................................24
   9. Management Considerations ......................................24
   10. IANA Considerations ...........................................24
   11. References ....................................................25
      11.1. Normative References .....................................25
      11.2. Informative References ...................................26
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