topic RE: WRED - anyone have experience configuring and using this? in ExtremeSwitching (EXOS/Switch Engine)

WRED - anyone have experience configuring and using this?

treese — Wed, 16 Jul 2014 19:08:00 GMT

Having TCP congestion on an Metro E circuit. I'm trying to fix bursty traffic flows

RE: WRED - anyone have experience configuring and using this?

treese — Wed, 16 Jul 2014 21:16:00 GMT

I believe I won't be able to use WRED, our switches are 8810's with G48Xc, G48Tc and 10G8Xc's. MSM's are 48c's. Can someone confirm this for me? We have a dr 1 gig ETH link connecting our cores to our DR site on an X450a. Files servers, db servers, vm replication, and monitoring traverse this link. Is there other TCP congestion options I can use? The pipe is only partially utilized but does burst up enough to drop extensive packets on the outbound interface.

Thank you,

RE: WRED - anyone have experience configuring and using this?

Sumit_Tokle — Wed, 16 Jul 2014 23:35:00 GMT

Only available on BlackDiamond X8 series switches, BlackDiamond 8900 c- and xl-series modules BlackDiamond 8900 xm-series modules, and Summit X670, X770, X460 X480 switches.

RE: WRED - anyone have experience configuring and using this?

treese — Wed, 16 Jul 2014 23:37:00 GMT

Thanks for the clarification. Got ideas how to deal with bursty TCP traffic traversing our direct connection?

RE: WRED - anyone have experience configuring and using this?

Sumit_Tokle — Thu, 17 Jul 2014 00:19:00 GMT

If it's bursty traffic then I don't think you have more options here instaead of dropping the packet on egress ports.

However, you could increase the port buffer space and see if this would help.

By default, 25% buffer space is allocated on every port.

configure port shared-packet-buffer [

RE: WRED - anyone have experience configuring and using this?

treese — Thu, 17 Jul 2014 01:37:00 GMT

I'll try this. Thank you again.

RE: WRED - anyone have experience configuring and using this?

treese — Thu, 17 Jul 2014 01:43:00 GMT

Do you info on how much to allow? As in should I bump it up in increments or skip to 75%? I don't know what overhead this causes. Are you aware of any risk with adjusting the buffer size?

Thank you.
Ted