TRILL: Header Extension
draft-ietf-trill-rbridge-extension-03

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Last updated 2012-03-02
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TRILL Working Group                                      Donald Eastlake
INTERNET-DRAFT                                                    Huawei
Intended status: Proposed Standard                        Anoop Ghanwani
                                                                    Dell
                                                          Vishwas Manral
                                                                      HP
                                                               Yizhou Li
                                                                  Huawei
                                                         Caitlin Bestler
                                                                 Quantum
Expires: September 1, 2012                                 March 2, 2012

                        TRILL: Header Extension
              <draft-ietf-trill-rbridge-extension-03.txt>

Abstract

   The IETF TRILL (Transparent Interconnection of Lots of Links) base
   protocol specifies minimal hooks to safely support TRILL Header
   extensions. This document specifies an initial extension providing
   additional flag bits and specifies two of those bits.

Status of This Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Distribution of this document is unlimited. Comments should be sent
   to the TRILL working group mailing list <rbridge@postel.org>.

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D. Eastlake, et al                                              [Page 1]
INTERNET-DRAFT                                   TRILL: Header Extension

Table of Contents

      1. Introduction............................................3
      1.1 Conventions used in this document......................3

      2. TRILL Header Extensions.................................4
      2.1 RBridge Extended Flag Handling Requirements............5
      2.2 No Critical Surprises..................................5
      2.3 Extension Header Flags.................................6
      2.3.1 Critical Summary Bits................................7
      2.3.2 Extended Header Flags................................8
      2.4 Conflict of Extentions.................................8

      3. Specific Extended Header Flags.........................10
      3.1 The RBridge Channel Alert Extended Flags..............10

      4. Additions to IS-IS.....................................11
      5. IANA Considerations....................................11
      6. Security Considerations................................12
      7. Acknowledgements.......................................12
      8. Normative References...................................13
      9. Informative References.................................13
      Change History............................................14

D. Eastlake, et al                                              [Page 2]
INTERNET-DRAFT                                   TRILL: Header Extension

1. Introduction

   The base IETF TRILL protocol [RFC6325] [RFC6326bis] provides a TRILL
   Header extension feature and describes minimal hooks to safely
   support header extension. (This feature is called "options" in
   Section 3.8 of [RFC6325].) But, except for the first two bits, the
   base TRILL protocol does not specify the structure of the extension
   to the TRILL Header nor the details of any particular extension. This
   document specifies an initial extension providing additional flag
   bits and specifies one of those bits. Additional extensions,
   including TLV (Type, Length, Value) encoded options, may be specified
   in later documents.

   Section 2 below describes some general principles of TRILL Header
   Extensions and an initial extension.  Section 3 describes a specific
   pair of flags in this initial extension.

1.1 Conventions used in this document

   The terminology and acronyms defined in [RFC6325] are used herein
   with the same meaning.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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