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08/27/2012

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BRCDbreams

Hi Eric,

Thanks for posting this. I like the way you build this up from simple constructs.

BTW, you mentioned for test 3:

"Also note that test 3 had an interesting result. I believe this was the result of multiple flows being stacked on the same physical link while the other link remained under utilized. Perhaps this is one of those areas where SDN could help."

I wanted to note that this is one good reason why the Brocade VCS Fabric has the Brocade ISL Trunk. The B-ISL Trunk automatically eliminates "hot spots" found in MLAG/LAG that are created by hashing techniques where an entire flow has to go on a physical link. Instead, B-ISL trunks uses frame stiping in hardware so all flows are uniformly distributed across all physical links. This means no hot spots and very high trunk utilization and its automatically configured so you don't have to program OpenFlow or an equivalent :-)

Thanks for posting this content. It's very useful.

Erik

Hi Brook, thanks! Glad you found it useful..

I completely agree that the underlay network could provide significant value add in these kinds of environments. BTW, based on some test results that I've seen, Brocade's frame based trunking approach has proven to allow for greater utilization than any of the other standards based approaches. As long as the customer is using VCS end to end, I can see value in following this kind of approach.

One problem (that I am actually working on right now) has to do with fully utilizing a bond when there is only a single Tunnel End Point on each physical server. Due to the way that Bonding/teaming is done, all of the traffic in a single tunnel will end up utiilizing the same physical link. Does Brocade have a solution for this particular problem?

Regards, Erik

Hank

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