Transparent Interconnection of Lots of Links (TRILL): MTU Negotiation
draft-ietf-trill-mtu-negotiation-02

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Document Type Active Internet-Draft (trill WG)
Last updated 2016-02-25
Replaces draft-zhang-trill-mtu-negotiation
Stream IETF
Intended RFC status Proposed Standard
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INTERNET-DRAFT                                                  M. Zhang
Intended Status: Standards Track                                X. Zhang
Updates: 7177                                                D. Eastlake
                                                                  Huawei
                                                              R. Perlman
                                                                     EMC
                                                               V. Manral
                                                                   Ionos
                                                           S. Chatterjee
                                                                   Cisco
Expires: August 28, 2016                               February 25, 2016

         Transparent Interconnection of Lots of Links (TRILL):
                            MTU Negotiation
                draft-ietf-trill-mtu-negotiation-02.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 state
   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 7177. 

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 August 28, 2016                 [Page 1]
INTERNET-DRAFT              MTU Negotiation            February 25, 2016

Copyright and License 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
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   described in the Simplified BSD License.

Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1. Conventions used in this document . . . . . . . . . . . . .  3
   2. Link-Wide TRILL 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 . . . . . . .  9
   8. Backwards Compatibility . . . . . . . . . . . . . . . . . . . .  9
   9. Security Considerations . . . . . . . . . . . . . . . . . . . . 10
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     11.1. Normative References . . . . . . . . . . . . . . . . . . . 10
     11.2. Informative References . . . . . . . . . . . . . . . . . . 11
   Author's Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

 

Mingui Zhang, et al     Expires August 28, 2016                 [Page 2]
INTERNET-DRAFT              MTU Negotiation            February 25, 2016

1. Introduction

   [RFC6325] describes the way 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 to fit
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