QOS over a Metro ethernet link

Unanswered Question
Jan 5th, 2010

All,

   I have a 10 mbps metro ethernet point to point link.  Nightly very large backups saturate the link, which is fine.  The issue is my network management traffic gets starved out and I get tons of device down emails.  The devices on each side are Cat 3560's running c3560-ipservices-mz.122-35.SE5.bin.  I have tried SRR on each side to no avail as well as trying to set a dscp value to icmp and giving it a small share of the bandwidth.  If anyone has any ideas on what I should try next I would appreciate it.

Bill

I have this problem too.
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Giuseppe Larosa Tue, 01/05/2010 - 12:40

Hello Bill,

even if not usual you could try to use the priority queue for the management traffic, in this way you should be able to give strict preference to this traffic.

Or,  have you tried to use shaped mode instead of shared mode ?  This also could be something to test.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_46_se/configuration/guide/swqos.html#wp1395244

Hope to help

Giuseppe

Marwan ALshawi Tue, 01/05/2010 - 21:47

do you have the link L2 trunk adn your services using diffrent VLANs? if yes you could use in 3560 per vlan policing !

William Maguire Wed, 01/06/2010 - 07:26

Hi,

  Thanks for the reply.  No the link is actually point to point routed (each side of the link has an IP address).

Thanks,

Bill

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