Auto-Configuration of Designated VLANs
draft-zhang-trill-dvlan-auto-02

INTERNET-DRAFT                                              Mingui Zhang
Intended Status: Proposed Standard                         Liangliang Ma
Expires: July 13, 2013                                      Xudong Zhang
                                                                  Huawei
                                                         January 9, 2013

                 Auto-Configuration of Designated VLANs
                  draft-zhang-trill-dvlan-auto-02.txt

Abstract

   When RBridges are connected by a bridge LAN link, they need to select
   out a Designated VLAN to be used for PDU exchange and TRILL data
   forwarding.

   This document specifies an approach for RBridges to automatically
   determine a Designated VLAN on a LAN link for default configured
   RBridges. When a DVLAN has to be changed for the sake of a better
   connectivity of a LAN link, RBridges can change their Designated VLAN
   with least traffic interruption according to the soft Designated VLAN
   change method. 

Status of this Memo

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Copyright and License Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors. All rights reserved.
 

Mingui Zhang, et al      Expires July 13, 2013                  [Page 1]
INTERNET-DRAFT          DVLAN Auto-Configuration         January 9, 2013

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
   2. Designated VLAN Determination . . . . . . . . . . . . . . . . .  3
     2.1. Designated VLAN for Most RBridges . . . . . . . . . . . . .  3
     2.2. DVLAN Initialization  . . . . . . . . . . . . . . . . . . .  4
   3. Soft DVLAN Change . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1. Backup DVLAN  . . . . . . . . . . . . . . . . . . . . . . .  5
     3.2. Adjacency on Backup DVLAN . . . . . . . . . . . . . . . . .  6
     3.3. DVLAN Change Restriction  . . . . . . . . . . . . . . . . .  7
   4. Security Considerations . . . . . . . . . . . . . . . . . . . .  7
   5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  7
   6. References  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     6.1. Normative References  . . . . . . . . . . . . . . . . . . .  7
     6.2. Informative References  . . . . . . . . . . . . . . . . . .  7
   Author's Addresses . . . . . . . . . . . . . . . . . . . . . . . .  8

 

Mingui Zhang, et al      Expires July 13, 2013                  [Page 2]
INTERNET-DRAFT          DVLAN Auto-Configuration         January 9, 2013

1. Introduction

   Designated VLAN (DVLAN) plays an important role in both TRILL
   protocol operations and data forwarding. According to [RFC6325] and
   [RFC6327], the DVLAN of a link is determined by the desired DVLAN of
   the DRB on this link. The desired DVLAN of an RBridge is usually
   manually configured by operators. If the desired DVLAN is not
   configured on an RBridge, its DVLAN is set to be the numerically
   lowest enabled VLAN ID, which is VLAN 1 for a default configuration
   RBridge [RFC6325]. TRILL frames except some TRILL Hellos are sent on
   a LAN link out tagged with the Designated VLAN. 

   This document specifies an approach for default configured RBridges
   on a link to automatically select a DVLAN. Under the circumstance
   that an RBrdige joins in a link whose DVLAN is not enabled on the