[trill] FW: New Version Notification for draft-yizhou-trill-tree-selection-02.txt
Yizhou Li <liyizhou@huawei.com> Tue, 15 January 2013 03:01 UTC
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From: Yizhou Li <liyizhou@huawei.com>
To: trill@ietf.org
Date: Tue, 15 Jan 2013 11:01:38 +0800
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Subject: [trill] FW: New Version Notification for draft-yizhou-trill-tree-selection-02.txt
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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 -----Original Message----- From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] Sent: Tuesday, January 15, 2013 10:54 AM To: liyizhou@huawei.com Cc: sunny.rajagopalan@us.ibm.com; haoweiguo@huawei.com; somnath.chatterjee01@gmail.com; radia@alum.mit.edu; naveen@broadcom.com 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. The IETF Secretariat