QOS for Lync over 3925s

[Leon Khanan]

HI guys,

I have a DS3 line with two cisco 3925 ISRs on both ends of the private line. I need to create a QOS to allow any lync traffic ( that is marked with dscp of 26) to go with highest priority and always to have sufficient bandwidth over this 42meg pipe. Does anyone has samples or examples of how to do it?

[Joseph W. Doherty · Accepted solution]

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Posting

class-map match-all lync

match dscp 26

policy-map sample

class lync

priority percent 33

interface (DS3)

service-policy output sample

[Leon Khanan]

Joseph,

do i need to specify anything other than that? (bandwidth on the  serial int?)

is there anyway i can test that it is working?

[Joseph W. Doherty]

Disclaimer

The     Author of this posting offers the information contained within this     posting without consideration and with the reader's understanding  that    there's no implied or expressed suitability or fitness for any   purpose.   Information provided is for informational purposes only and   should not   be construed as rendering professional advice of any kind.   Usage of  this  posting's information is solely at reader's own risk.

Liability Disclaimer

In     no event shall Author be liable for any damages whatsoever   (including,   without limitation, damages for loss of use, data or   profit) arising  out  of the use or inability to use the posting's   information even if  Author  has been advised of the possibility of  such  damage.

Posting

First, check to see if traffic is being matched.  Use the show policy interface command.

Second, if the interface is congested with non-Lync traffic (and not Lync traffic), pinging the other side using DSCP 26 should show very little increase vs. when interface isn't congested.

[Leon Khanan]

Thanks for the  help