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Transparent Interconnection of Lots of Links (TRILL): Header Extension
RFC 7179

Internet Engineering Task Force (IETF)                   D. Eastlake 3rd
Request for Comments: 7179                                        Huawei
Updates: 6325                                                A. Ghanwani
Category: Standards Track                                           Dell
ISSN: 2070-1721                                                V. Manral
                                                             Ionos Corp.
                                                                   Y. Li
                                                                  Huawei
                                                              C. Bestler
                                                         Nexenta Systems
                                                                May 2014

 Transparent Interconnection of Lots of Links (TRILL): Header Extension

Abstract

   The IETF Transparent Interconnection of Lots of Links (TRILL) base
   protocol (RFC 6325) specifies minimal hooks to safely support TRILL
   Header extensions.  This document specifies an initial extension
   providing additional flag bits and specifies some of those bits.  It
   updates RFC 6325.

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/rfc7179.

Eastlake, et al.             Standards Track                    [Page 1]
RFC 7179                 TRILL: Header Extension                May 2014

Copyright 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. TRILL Header Extensions .........................................3
      2.1. RBridge Extended Flag Handling Requirements ................5
      2.2. No Critical Surprises ......................................5
      2.3. Extended Header Flags ......................................6
           2.3.1. Critical Summary Bits ...............................7
      2.4. Conflict of Extensions .....................................8
   3. Specific Extended Header Flags ..................................9
      3.1. RBridge Channel Alert Extended Flags .......................9
   4. Additions to IS-IS ..............................................9
   5. IANA Considerations ............................................10
   6. Security Considerations ........................................10
   7. Acknowledgements ...............................................11
   8. References .....................................................11
      8.1. Normative References ......................................11
      8.2. Informative References ....................................11

Eastlake, et al.             Standards Track                    [Page 2]
RFC 7179                 TRILL: Header Extension                May 2014

1.  Introduction

   The base IETF Transparent Interconnection of Lots of Links (TRILL)
   protocol [RFC6325] provides a TRILL Header extension feature and
   describes minimal hooks to safely support header extensions.  (This
   feature is called "options" in Section 3.8 of [RFC6325].)  But,
   except for the first two bits, the TRILL base protocol document does
   not specify the structure of extensions to the TRILL Header nor the
   details of any particular extension.

   This document is consistent with [RFC6325] and provides further
   details.  It specifies an initial extension word providing additional
   flag bits and specifies some of those bits.  Additional extensions,
   including TLV-encoded options, may be specified in later documents,

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