" would really recommend that you work on creating QOS statements on your access layer before you worry to much about working with QOS on your firewall unless your dataplane is constantly starved for resources."
Is it ok setting qos for skype through gpo on end user's pc
or is it must we need to do on access switches or in distribution switches
Did you verify how much class 2 traffic goes through your firewall when you test Skype? Does it constantly cap at 25 Mbps? You can see the real-time statistics under the Network tab, then QoS and click on Statistics for the desired interface.
@sib2017 end-user qos is usually done more so for simplified QOS markings; basically so that you know what DSCP value will come across so that you can quickly build the QOS statements on your switches. Once the traffic is tagged with DSCP 46 you still need to tell the switch how to actually process the DSCP 46 traffic and what priority it should actually get that traffic out of the outbound/inbound queue.
It sounds like what you should do is
1) Build the GPO so that you know what DSCP value is going to be marked
2) Build out the qos statements on your switches (no idea what brand you are using for this, I could provide a Cisco example if that is what you are using). Depending on the brand it may default to standard QOS statements, but likely qos isn't enabled out of the box.
3) If it's still choppy then start looking at QOS on the PA; likely though you are running into issues before you reach the firewall.
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