Future TRILL and TRILL Related Work March 2010 Future TRILL and TRILL Related Work Donald Eastlake 3rd +1-508-333-2270 d3e3e3@gmail.com March 2010 Future TRILL Work Future TRILL Work

Future TRILL Work Potential Future TRILL Work/Documents: March 2010 Future TRILL Work Potential Future TRILL Work/Documents: 802.1 Features Data Center Bridging Priority-Based Flow Control (802.1Qbb) Enhanced Transmission Selection (802.1Qaz) Congestion Notification (802.1Qau) Provider RBridges (802.1ad, 802.1ah) OAM – BFD, etc. March 2010 Future TRILL Work Future TRILL Work

Questions on These Work Items Is the item important/high-value? Is the item urgent/time-sensitive? Who would like to work on it? Important & Urgent Important & Distant Unimportant & Urgent Unimportant & Distant March 2010 Future TRILL Work

Data Center Bridging Three standards being specified in 802.1 to allocate bandwidth and eliminate frame loss due to queue overflow. 802.1Qbb – per priority PAUSE 802.3bd – new PAUSE frame format 802.1Qaz – allocation of link bandwidth to traffic classes 802.1Qau – Congestion Notification. Facilities to limit flows at their originating end station March 2010 Future TRILL Work

Data Center Bridging (cont.) Priority-Based Flow Control (802.1Qbb, 802.3bd) An amendment to 802.1Q that provides the 802.3 PAUSE facility separately for different frame priorities plus an amendment to 802.3 specifying a control frame to control this PAUSE facility. Current in 802.1 WG Ballot recirculation. Can be implemented in RBridge ports below TRILL so no changes in TRILL required. March 2010 Future TRILL Work

Data Center Bridging (cont.) Enhanced Transmission Selection (802.1Qaz) Permits separately specifying limits for different traffic class queues, distinguished by priority, to enforce bandwidth quotas and the like. Currently at Draft 1.2 in IEEE 802.1. Can be implemented in RBridge ports below TRILL so no changes in TRILL required. March 2010 Future TRILL Work

Data Center Bridging (cont.) Congestion Notification (802.1Qau) Layer 2 method to rate limit, at end stations, flows causing congestion. In IEEE Sponsor Ballot re-circulation. Some changes to RBridges beyond those required in 802.1 Bridges would be required to support 802.1Qau. For example, a congestion control message in response to a TRILL data frame should get back to the true origin station, not just the ingress or previous hop RBridge. March 2010 Future TRILL Work

Provider RBridges IEEE 802.1ad-2005, “Provider Bridges”, and IEEE 802.1ah-2008, “Provider Backbone Bridges”, are completed amendments to 802.1Q to support transparent carrier Ethernet service. Provider Bridges (Q-in-Q) use outer S-Tags Provider Backbone Bridges (MAC-in-MAC) It should be straight forward to specify Provider RBridges and/or the equivalent of Provider Backbone RBridges. March 2010 Future TRILL Work

OAM: Operations, Administration, and Management The link state database provides significant information about the entire campus to each RBridge. IEEE 802.1AB-2009, “Station and Media Access Control Connectivity Discovery”, provides a protocol to learn about peers. There should probably be a “BFD for TRILL” document. There should probably be some ICMP / 802.1ag like facility to implement traceroute, report errors, etc. March 2010 Future TRILL Work