QOS management on 2960 lan-lite switches
one of my customers is starting to migrate his voice infrastructure to a
solution based on Cisco UCM and Cisco VOIP phones.
The access switches he is currently using are all Cisco 2960 with
LAN-LITE feature set and unfortunately the qos capabilities of these
devices are very limited.
In my first attempt to overcome this limitation I deployed and tested
the configuration reported below:
mls qos srr-queue input cos-map queue 2 threshold 1 3 5
mls qos srr-queue input priority-queue 2 bandwidth 20
mls qos srr-queue output cos-map queue 1 threshold 1 3 5
mls qos srr-queue output cos-map queue 2 threshold 3 0
The problem is that the customer is currently using a desktop
virtualization solution (not Cisco VXI) based on ultra-thin client
devices; these devices generate a very bursty traffic workload and the
output-queue 2-3 is experiencing a very high packet drop (which
generates a poor user experience).
Next step I'd like to try is to grow the output queue size of the
fast-ethernet ports from 40 (which is the default) to 60 in the attempt
to lower the tail-drop effet on the output-queue 2-3. What about it?
Are there any options or solutions I'm currently not considering?
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