Subject: [trill] FW: New Version Notification for draft-yizhou-trill-tree-selection-02.txt

From: Yizhou Li <[email-masked]>
Date: Tue, 15 Jan 2013 11:01:38 +0800

Dear folks,

We have updated the draft. A new section (section 5) was added to talk about another data plane approach, aggregated tree nickname, based on comments received. 
The co-authors would like to ask for more comments on both approaches for the multicast forwarding table size reduction. Thank you.

Yizhou

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From: [email-masked] [mailto:[email-masked]] 
Sent: Tuesday, January 15, 2013 10:54 AM
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Subject: New Version Notification for draft-yizhou-trill-tree-selection-02.txt

A new version of I-D, draft-yizhou-trill-tree-selection-02.txt
has been successfully submitted by Yizhou Li and posted to the
IETF repository.

Filename:	 draft-yizhou-trill-tree-selection
Revision:	 02
Title:		 VLAN based Tree Selection for Multi-destination Frames
Creation date:	 2013-01-15
WG ID:		 Individual Submission
Number of pages: 17
URL:             http://www.ietf.org/internet-drafts/draft-yizhou-trill-tree-selection-02.txt
Status:          http://datatracker.ietf.org/doc/draft-yizhou-trill-tree-selection
Htmlized:        http://tools.ietf.org/html/draft-yizhou-trill-tree-selection-02
Diff:            http://www.ietf.org/rfcdiff?url2=draft-yizhou-trill-tree-selection-02

Abstract:
   TRILL uses the distribution trees to deliver multi-destination frames.
   Multiple trees can be used by an ingress RBridge for different flow
   based on VLAN and/or multicast group. Different ingress RBridges may
   choose different distribution trees for the same VLAN and/or
   multicast group traffic. Distribution trees are normally pruned based
   on VLAN.

   For any RBridge RBn, if RBn has downstream receivers of VLAN x in a
   distribution tree t, there will be an entry of (t, x, port list) in
   the multicast forwarding table on RBn. If there are n trees and m
   VLANs, the multicast forwarding table size on RBn is typically n*m
   entries. The value of m is up to 4096 and n is the total number of
   distribution trees in the campus. If fine grained labeling is
   implemented or finer granularity filtering such as VLAN plus L2/L3
   multicast address is used for pruning, the multicast forwarding table
   size further increases dramatically. TRILL multicast forwarding table
   size is limited by hardware and L3 multicasting may share the same
   table with it in hardware implementations. Therefore multicast table
   entry is a precious resource. This document specifies a VLAN based
   tree selection mechanism to reduce the TRILL multicast forwarding
   table size on RBridge.

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