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Future TRILL and TRILL Related Work

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

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Future TRILL and TRILL Related Work

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

  2. 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. Future TRILL Work

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

  4. 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 Future TRILL Work

  5. 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. Future TRILL Work

  6. 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. Future TRILL Work

  7. 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. Future TRILL Work

  8. 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. Future TRILL Work

  9. 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. Future TRILL Work

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