QOS on 2960x

[paddy1584]

We have been experiencing Zoom call quality issues. The network latency and jitter are good. jitter at 7ms and latency < 35ms.

We dont have any bandwidth constraints. does configuring the access ports on 2960x to trust dscp will help improve the situation.

[Reza Sharifi]

Have a look at this port. You may want to try the example config on a few ports and see if it makes any difference.

https://community.cisco.com/t5/routing/needing-an-example-of-cisco-qos-for-zoom/td-p/3919903

HTH

[Joseph W. Doherty · Accepted solution]

If your latency and jitter are (truly) within the service needs of Zoom and further Zoom also obtains the bandwidth it needs, then (in theory) you shouldn't need QoS.

I believe (?) on a 2960x you only need to trust (or have a ingress service policy) on a port if a) QoS is enabled on the switch and b) you intend to rely on packet and/or frame markings (and also that you don't want them reset).

Trusting a port's L3 ToS would only be useful if a) packets or frames are marked as needed and b) your QoS policy provides the SLAs the traffic needs.  I.e. is your traffic marked as desired and do you have a policy that will use the markings as desired?

Also BTW, if QoS is enabled on the switch, you will have a default QoS policy.  If you enable/use Auto QoS, you'll have different default QoS policy.