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802.1Qbp - Equal Cost Multiple Paths

The full title of this PAR is "IEEE Standard for Local and Metropolitan Area Networks---Virtual Bridged Local Area Networks - Amendment: Equal Cost Multiple Paths (ECMP)".

This standard specifies protocols, procedures and managed objects to support utilizing multiple possible next hop choices for frames within a single service in Shortest Path Bridging MAC Mode (SPBM) networks. This is accomplished by applying one of a set of standard functions per frame at ingress and using the result as an input to all subsequent choices among multiple next hops as the frame transits the SPBM network. These functions are selected to ensure that frames belonging to the same data flow take the same path. Frames belonging to other flows can take other paths. It is anticipated that a new Tag will be defined possibly including a Time to Live (TTL) field. The standard defines Connectivity Fault Management (CFM) enhancements that can be used to proactively monitor and diagnose the paths that data takes through the network.

This standard provides the additional capability to use many more equal cost paths than 802.1aq's current Equal Cost Tree (ECT) mechanism due to improved scaling properties with respect to network diameter. This standard would be used in conjunction with an 802.1aq based control plane and would use specific Base Virtual Local Area Network identifiers (B-VIDs) and new ECT-ALGORITHMs as defined by 802.1aq. This standard may include multipath function information and may use time to live (TTL) loop mitigation. Corresponding new EtherTypes would be used to identify the new Tag formats. It is expected that both the current 802.1aq ECT and ECMP would be used at the same time in the same network (for different traffic/service categories) but differentiated by B-VID. This standard enhances Connectivity Fault Management (CFM) to monitor and diagnose the richer connectivity provided.

As diameter and number of adjacencies grow the number of paths increases exponentially. In such richly connected networks ECMP in addition to ECT allows for better utilization in proportion to the state required. TTL augments loop mitigation in the face of hardware, software and design failures. An augmented SPBM with this capability addresses urgent customer requests to meet the above needs with a single protocol, a single data path and a unified Operations, Administration and Management (OA&M) suite.

StatusPAR approved May 17th, 2011; Standard approved Mar 27th, 2014
EditorBen Mackcrane

19 Jul 2011802.1Qbp, Draft 0.0
13 Oct 2011802.1bp, Draft 0.1
04 Nov 2011802.1bp, Draft 0.1 proposed comment dispositions
09 Nov 2011802.1bp, Draft 0.1 proposed comment dispositions
17 Jan 2012802.1bp, Draft 0.1 comment dispositions
16 Feb 2012802.1bp, Draft 0.2
07 Mar 2012802.1bp, Draft 0.2 proposed comment dispositions
15 Mar 2012802.1bp, Draft 0.2 comment dispositions
24 Apr 2012802.1bp, Draft 0.3
15 May 2012802.1bp, Draft 0.3 proposed comment dispositions
18 May 2012802.1bp, Draft 0.3 comment dispositions
20 Jun 2012802.1bp, Draft 1.0
18 Jul 2012802.1bp, Draft 1.0 proposed comment dispositions
19 Jul 2012802.1bp, Draft 1.0 comment dispositions
17 Aug 2012802.1bp, Draft 1.1
10 Sep 2012802.1bp, Draft 1.1 proposed comment dispositions
13 Sep 2012802.1bp, Draft 1.1 comment dispositions
20 Oct 2012802.1bp, Draft 1.2
12 Nov 2012802.1bp, Draft 1.2 proposed comment dispositions
15 Nov 2012802.1bp, Draft 1.2 comment dispositions
07 Feb 2013802.1bp, Draft 1.3
20 Mar 2013802.1bp, Draft 1.3 comment dispositions
15 Apr 2013802.1bp, Draft 1.4
15 May 2013802.1bp, Draft 1.4 comment dispositions
15 Jun 2013802.1bp, Draft 1.5
17 Jul 2013802.1bp, Draft 1.5 comment dispositions
18 Jul 2013802.1bp, Draft 1.5 comment dispositions
01 Sep 2013802.1bp, Draft 1.6
03 Sep 2013802.1bp, Draft 1.6 comment dispositions
15 Mar 2014802.1bp, Draft 1.7

21 Apr 2011Presentation bp-mackcrane-editor-notes-0411.pdf
28 Apr 2011Presentation bp-sajassi-bridge-model-0411-v01.pdf
08 May 2011Presentation bp-mackcrane-editor-notes-0511.pdf
08 May 2011Presentation bp-mackcrane-multicast-spreading-0511.pdf
09 May 2011Presentation bp-mackcrane-tag-format-0511.pdf
10 May 2011Presentation bp-agarwal-hash-proposal-0411-v1.pdf
10 May 2011Presentation bp-sajassi-bridge-model-0511-v01.pdf
20 May 2011Presentation bp-sajassi-ect-selection-0511-v01.pdf
27 Jun 2011Presentation bp-agarwal-hash-proposal-0411-v02.pdf
30 Jun 2011Presentation bp-sajassi-oam-0611-v01.pdf
20 Jul 2011Presentation bp-mackcrane-editor-notes-0711.pdf
20 Jul 2011Presentation bp-mackcrane-tag-format-0711.pdf
20 Jul 2011Presentation bp-sajassi-cfm-0711-v01.pdf
21 Jul 2011Presentation bp-agarwal-hash-proposal-0411-v03.pdf
25 Aug 2011Presentation bp-mackcrane-multicast-spreading-0811.pdf
19 Sep 2011Presentation bp-weiyh-loopback-0911-v00.pdf
21 Sep 2011Presentation bp-mackcrane-editor-notes-0911.pdf
21 Sep 2011Presentation bp-mackcrane-multicast-spreading-0911.pdf
21 Sep 2011Presentation bp-sajassi-local-hashing-0911-v01.pptx
08 Nov 2011Presentation bp-ashwood-shared-trees-1011-v03.pdf
09 Nov 2011Presentation bp-mackcrane-editor-notes-1111.pdf
30 Nov 2011Presentation bp-ashwood-one-slide-1111-v01.pdf
16 Dec 2011Presentation bp-ashwood-one-slide-1215-v3.pdf

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Last modified by jmesseng, at 6:10AM on Thu, 27 Mar 2014