TRILL: Appointed Forwarders
draft-ietf-trill-rfc6439bis-01

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Document Type Active Internet-Draft (trill WG)
Last updated 2016-01-05
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
                                                              Hu Fangwei
                                                                     ZTE
Expires: July 4, 2016                                    January 5, 2016

                      TRILL: Appointed Forwarders
                  <draft-ietf-trill-rfc6439bis-01.txt>

Abstract

   TRILL 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", 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 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 <trill@ietf.org>.

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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............................13

      3. The Inhibition Mechanism...............................15
      3.1 Inhibited Appointed Forwarder Behavior................17
      3.2 Root Change Inhibition Optimizations..................17
      3.2.1 Change Optimization One.............................18
      3.2.2 Change Optimization Two.............................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
      10.2 Appointment Bitmap APPsub-TLV........................30
      10.3 Appointment List APPsub-TLV..........................31
      10.4 FGL-VLAN Mapping Bitmap APPsub-TLV...................32
      10.5 FGL-VLAN Mapping Pairs APPsub-TLV....................34
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