All-Path Bridging Update IEEE Plenary meeting San Francisco July Jun Tanaka (Fujitsu Labs. Ld.) Guillermo Ibanez (UAH) Vinod Kumar (Tejas Networks )

All-Path : Basic Idea Modified learning, filtering and forwarding Addressed to small and medium size networks Objectives: overcome RSTP limitations and obtain good latency paths without configuration MAC=a MAC=b x x Flooding Blocking

2015/9/232 Scope of All-Path Scalability Manageability SPB, ECMP TRILL ALL-PATH Enterprise, Campus, Small datacenter etc. Simple Less operation Natural load balance Large area, provider network Large datacenter etc. Both support, loop free, shortest path LAN MAN/WAN

2015/9/233 Issue1. Path Recovery Mechanism: When unknown unicast frame arriving at bridge with failed link, path fail message is generated per MAC entry towards source bridge, that generates corresponding ARP to re-establish tree. Question: If 10K MAC entries are existed in FDB, 10K path fail frames should be generated, is it feasible processing for local CPU, especially in high-speed link (ex. 10GE)? It can be applicable for small or medium networks if we are targeting the enterprise, campus and small datacenter etc. Moreover, a solution is proposed that minimize the frame generation.

2015/9/234 Path recovery (cont’d) MAC=a MAC=b bbb b aaaa a a flush “b” SW1SW2 SW3 SW4 SW5 SW flush message is terminated because “b” is not binded to port1 May includes two or more…ex. 100s of MAC addresses to be flushed as a list. Delete entry “b” from FDB and re-sends the flush message to SW1. When link failure is detected, MAC flush lists (187 MAC / 1500B frame) are flooded. 54 frames by a day for 10K MAC entry. Avoid unnecessary flooding, MAC list is deleted to shorten. Issues: How to prevent flush frame loss. May require CPU processing power. Experience: 15ms to flush 10K MACs in a node (1GHz MIPS Core)

2015/9/235 Issue2. Server Edge Vswitch NIC Question: If a server has two or more NICs, how to find which port is first? vswitch: only vswitch to support All-Path VEB: both VEB and vswitch to support All-Path VEPA: only external switch to support All-Path Vswitch NIC VEB NIC VEB VEPA NIC Ext. switch

2015/9/236 Issue3. Load Balance Load balance is available in natural way because high load link tend not to be selected with queuing delay. Pros: zero-configuration load balance, no extra processing effort Cons: you cannot control load balance like SPB/ECMP

2015/9/237 Report on Proposal for AVB TG May 12, Thu, morning AVB Dr. Ibanez presented the materials as used in IW session (Singapore and Santa Fe) Questions and comments –Any other metric than latency e.g. bandwidth? –Path recovery time comparing with RSTP? –Any broadcast storm occurred when link failed? –What’s the status in IW session, any PAR created? AVB status –They try to solve by their own way, using SRP. –Not only latency but also bandwidth can be used as metric –Also redundant path can be calculated