Spanning Tree Protocol (STP) Application of the Inter-Chassis Communication Protocol (ICCP)
RFC 7727

Document Type RFC - Proposed Standard (January 2016; No errata)
Last updated 2016-01-22
Replaces draft-zhang-pwe3-iccp-stp
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Stream WG state Submitted to IESG for Publication Dec 2014
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IESG IESG state RFC 7727 (Proposed Standard)
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Internet Engineering Task Force (IETF)                          M. Zhang
Request for Comments: 7727                                        H. Wen
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                                    J. Hu
                                                           China Telecom
                                                            January 2016

                Spanning Tree Protocol (STP) Application
           of the Inter-Chassis Communication Protocol (ICCP)

Abstract

   The Inter-Chassis Communication Protocol (ICCP) supports an inter-
   chassis redundancy mechanism that is used to support high network
   availability.

   In this document, Provider Edge (PE) devices in a Redundancy Group
   (RG) running ICCP are used to offer multihomed connectivity to
   Spanning Tree Protocol (STP) networks to improve availability of the
   STP networks.  The ICCP TLVs and usage for the ICCP STP application
   are defined.

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/rfc7727.

Zhang, et al.                Standards Track                    [Page 1]
RFC 7727                 STP Application of ICCP            January 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.

Zhang, et al.                Standards Track                    [Page 2]
RFC 7727                 STP Application of ICCP            January 2016

Table of Contents

   1. Introduction ....................................................4
      1.1. Conventions Used in This Document ..........................4
      1.2. Terminology ................................................4
   2. Use Case ........................................................5
   3. Spanning Tree Protocol Application TLVs .........................6
      3.1. STP Connect TLV ............................................6
      3.2. STP Disconnect TLV .........................................7
           3.2.1. STP Disconnect Cause Sub-TLV ........................8
      3.3. STP Configuration TLVs .....................................8
           3.3.1. STP System Config ...................................9
           3.3.2. STP Region Name ....................................10
           3.3.3. STP Revision Level .................................10
           3.3.4. STP Instance Priority ..............................11
           3.3.5. STP Configuration Digest ...........................12
      3.4. STP State TLVs ............................................12
           3.4.1. STP Topology Changed Instances .....................12
           3.4.2. STP CIST Root Time Parameters ......................14
           3.4.3. STP MSTI Root Time Parameter .......................15
      3.5. STP Synchronization Request TLV ...........................16
      3.6. STP Synchronization Data TLV ..............................17
   4. Operations .....................................................18
      4.1. Common AC Procedures ......................................18
           4.1.1. Remote PE Node Failure or Isolation ................19
           4.1.2. Local PE Isolation .................................19
      4.2. ICCP STP Application Procedures ...........................19
           4.2.1. Initial Setup ......................................19
           4.2.2. Configuration Synchronization ......................20
           4.2.3. State Synchronization ..............................21
           4.2.4. Failure and Recovery ...............................22
   5. Security Considerations ........................................22
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