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TRILL IS-IS MTU Negotiation
draft-zhang-trill-mtu-negotiation-06

Document type: Active Internet-Draft (individual)
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Last updated: 2014-08-13
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INTERNET-DRAFT                                              Mingui Zhang
Intended Status: Standards Track                            Xudong Zhang
Updates: 6325                                            Donald Eastlake
                                                                  Huawei
                                                           Radia Perlman
                                                                   Intel
                                                          Vishwas Manral
                                                                   Ionos
                                                      Somnath Chatterjee
                                                                   Cisco
Expires: February 15, 2015                               August 14, 2014

                      TRILL IS-IS MTU Negotiation
                draft-zhang-trill-mtu-negotiation-06.txt

Abstract

   The base IETF TRILL protocol has a TRILL campus wide MTU feature,
   specified in RFC 6325 and RFC 7177, that assures that link status
   changes can be successfully flooded throughout the campus while being
   able to take advantage of a campus wide capability to support jumbo
   packets. This document specifies optional updates to that MTU feature
   to take advantage, for appropriate link local packets, of link local
   MTUs that exceed the TRILL campus MTU. In addition, it specifies an
   efficient algorithm for local MTU testing. It 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.

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Mingui Zhang, et al    Expires February 15, 2015                [Page 1]
INTERNET-DRAFT              MTU Negotiation              August 14, 2014

Copyright and License Notice

   Copyright (c) 2014 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 . . . . . . . . . . . . .  3
   2. Link-Wide TRILL IS-IS MTU Size  . . . . . . . . . . . . . . . .  3
   3. Link MTU Size Testing . . . . . . . . . . . . . . . . . . . . .  5
   4. Refreshing Campus-Wide Sz . . . . . . . . . . . . . . . . . . .  7
   5. Relationship between Port MTU, Lz and Sz  . . . . . . . . . . .  8
   6. LSP Synchronization . . . . . . . . . . . . . . . . . . . . . .  8
   7. Recommendations for Traffic Link MTU Size Testing . . . . . . .  8
   8. Backwards Compatibility . . . . . . . . . . . . . . . . . . . .  9
   9. Security Considerations . . . . . . . . . . . . . . . . . . . .  9
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     11.1. Normative References . . . . . . . . . . . . . . . . . . . 10
     11.2. Informative References . . . . . . . . . . . . . . . . . . 10
   Author's Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

 

Mingui Zhang, et al    Expires February 15, 2015                [Page 2]
INTERNET-DRAFT              MTU Negotiation              August 14, 2014

1. Introduction

   [RFC6325] describes the way how RBridges agree on the campus-wide
   minimum acceptable inter-RBridge MTU (Maximum Transmission Unit) size
   - the campus-wide Sz to ensure that link state flooding operates
   properly and all RBridges converge to the same link state. For the
   proper operation of TRILL IS-IS, all RBridges MUST format their LSPs

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