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Date: February 17, 2012, 8:51 pm
From: Anima:
BECN: as tifafrc goes through FR cloud from R1 to R2 and switch experiences congestion, it sets BECN bit to 1 on tifafrc returning back to R1 (ie. ACKs, replies). Or it can generate Q.922 test frame with BECN bit set to 1 itself and inform offending routers they need to slow down. If R1 is configured to react to BECN bits, it cuts tifafrc down by 25% (or 50%?) up to a value set as mincir. You need to set shape adaptive in your QoS profile in order for router to react on BECN bits. FECN: If there is no returning tifafrc from R2 to R1, ie. constant udp stream R1->R2 obly, FR switch experiencing congestion sets FECN bit to 1 and forwards the frame to R2. R2 receives FECN'd frame amd generates Q.922 test frame back to router R1. FR switch experiencing congestion sets BECN bit on that test frame to 1 because routers slow down only when they receive BECN'd frame. You need to configure shape fecn-adapt in your QoS profile in order for router to listen to FECN'd frames and send Q.922 frames back. That's how I understood it when studying QoS, hope it's correct :-)
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Date: August 15, 2012, 9:38 am
From: Sawasdee:
BECN: as traffic goes thrugoh FR cloud from R1 to R2 and switch experiences congestion, it sets BECN bit to 1 on traffic returning back to R1 (ie. ACKs, replies). Or it can generate Q.922 test frame with BECN bit set to 1 itself and inform offending routers they need to slow down. If R1 is configured to react to BECN bits, it cuts traffic down by 25% (or 50%?) up to a value set as mincir. You need to set shape adaptive in your QoS profile in order for router to react on BECN bits. FECN: If there is no returning traffic from R2 to R1, ie. constant udp stream R1->R2 obly, FR switch experiencing congestion sets FECN bit to 1 and forwards the frame to R2. R2 receives FECN'd frame amd generates Q.922 test frame back to router R1. FR switch experiencing congestion sets BECN bit on that test frame to 1 because routers slow down only when they receive BECN'd frame. You need to configure shape fecn-adapt in your QoS profile in order for router to listen to FECN'd frames and send Q.922 frames back. That's how I understood it when studying QoS, hope it's correct :-)
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Date: August 15, 2012, 3:27 pm
From: Susana:
DCB ain't ready, folks. Neither is FCoE. Although Ethernet will eventually sidilene InfiniBand and Fibre Channel, that's not a 2011 topic. I expect to hear a lot of noise about converged network and storage I/O, including high-profile customer adoption stories, but we're still a few years short of actual impact and serious market share movement. Practical application starts in 2011, though, and it'll get major coverage and big-money action in the vendor space.
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Date: August 16, 2012, 5:32 pm
From: Bruno:
We need more inishtgs like this in this thread.
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