c3850 priority-queue

[tedauction]

Hello, on my WS-C3850-48P, I have a Port-channel trunk leading to another switch. I have EF marked traffic entering this trunk.

On older models of switch I would have entered the command 'priority-queue out' on this trunk interface to activate the priority-queue therefore ensuring my EF traffic got placed in to it. However I know this model switch does not support that old command.

So, do I need to do anything to ensure my 'EF' marked traffic gets trunk interface priority queue treatment on this model switch or will it automatically do it ?

Thank you kindly for any help.

[Georg Pauwen]

Hello,

on the 3850, ingress has default trust dscp enabled, with no policy needed. Egress uses dscp as classification.

Check this link:

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/118629-technote-qos-00.html#anc20

[tedauction]

Thanks for that, but I was just asking whether I need to specifically do anything to 'enable' the 'priority queue' on this 3850 trunk interface.

Thanks kindly.

[Georg Pauwen]

Sorry for the misunderstanding. For ingress, you don't need to do anything, as dscp is trusted. For egress, you need to define a policy using dscp as classification, in order to get your EF marked traffic prioritized. The document in the link describes how...