TRILL: Appointed Forwarders
draft-ietf-trill-rfc6439bis-05

Document Type Active Internet-Draft (trill WG)
Last updated 2017-03-23 (latest revision 2017-02-21)
Replaces draft-eastlake-trill-rfc6439bis
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TRILL Working Group                                      Donald Eastlake
INTERNET-DRAFT                                                 Yizhou Li
Intended status: Proposed Standard                                Huawei
Obsoletes: 6439                                           Mohammed Umair
Updates: 6325, 7177                                           IPinfusion
                                                           Ayan Banerjee
                                                                   Cisco
                                                              Fangwei Hu
                                                                     ZTE
Expires: August 20, 2017                               February 21, 2017

                      TRILL: Appointed Forwarders
                  <draft-ietf-trill-rfc6439bis-05.txt>

Abstract

   TRILL (Transparent Interconnection of Lots of Links) supports multi-
   access LAN (Local Area Network) links where a single link can have
   multiple end stations and TRILL switches attached.  Where multiple
   TRILL switches are attached to a link, native traffic to and from end
   stations on that link is handled by a subset of those TRILL switches
   called "Appointed Forwarders" as originally specified in RFC 6325,
   with the intent that native traffic in each VLAN be handled by at
   most one TRILL switch.  This document clarifies and updates the
   Appointed Forwarder mechanism. It updates RFC 6325, updates RFC 7177,
   and obsoletes RFC 6439.

Status of This Document

   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 <trill@ietf.org>.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
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   Drafts.

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D. Eastlake, et al                                              [Page 1]
INTERNET-DRAFT                               TRILL: Appointed Forwarders

Table of Contents

      1.  Introduction...........................................4
      1.1 Appointed Forwarders and Active-Active.................5
      1.2 Terminology and Acronyms...............................5

      2. Appointed Forwarders and Their Appointment..............7
      2.1 The Appointment Databases and DRB Actions..............8
      2.2 Appointment Effects of DRB Elections...................9
      2.2.1 Processing Forwarder Appointments in Hellos.........10
      2.2.2 Frequency of Hello Appointments.....................12
      2.2.3 Appointed Forwarders Hello Limit....................12
      2.3 Local Configuration Actions Appointment Effects.......13
      2.4 Overload and Appointed Forwarders.....................13
      2.5 VLAN Mapping within a Link............................14

      3. The Inhibition Mechanism...............................15
      3.1 Inhibited Appointed Forwarder Behavior................17
      3.2 Root Change Inhibition Optimizations..................17
      3.2.1 Optimization for Change to Lower Priority...........18
      3.2.2 Optimization for Change to Priority Only............18
      3.2.3 Settling Detection Optimization.....................18

      4. Optional TRILL Hello Reduction.........................20
      5. Multiple Ports on the Same Link........................22

      6. Port-Shutdown Messages.................................23
      6.1 Planned Shutdown and Hellos...........................23
      6.2 Port-Shutdown Message Structure.......................23
      6.3 Port-Shutdown Message Transmission....................24
      6.4 Port-Shutdown Message Reception.......................25
      6.5 Port-Shutdown Message Security........................25
      6.6 Port-Shutdown Configuration...........................25

      7. FGL-VLAN Mapping Consistency Checking..................27

      8. Support of E-L1CS......................................28
      8.1 Backwards Compatibility...............................28

      9. Security Considerations................................29

      10. Code Points and Data Structures.......................30
      10.1 IANA Considerations..................................30
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