CRS125 - Modify PCP value on egress packets

Hi.

How is it possible to modify the PCP value (802.1q) for some packets on an port? We need to mark/modify with a PCP value the packets of some VLANs on an interface, so the packets of those VLANs doesn’t have the PCP value to 0 and we mark it with the right value.

Is it needed to use a Brige port? Won’t it be causing a sever slowdown in performance?

Thanks a lot.

Daniel