Filter and Force PCP Values

In Layer 2 extended ACL rules, re-marking (forcing) PCP values can change the priority on ingress traffic.

You can also filter ingress and egress Layer 2 packets by PCP value.

Access access global configuration mode.
```
device# configure
```

Create or access the ACL.

device(config)# mac access-list extended mac_ac12

To filter incoming or outgoing packets by PCP value, use the pcp parameter to define permit and deny rules.

device(conf-macl-ext)# seq 5 permit host 0022.3333.4444 host 0022.3333.5555 pcp 2
device(conf-macl-ext)# deny host 0022.3333.7777 host 0022.3333.6666 pcp 5

To re-mark the PCP value of incoming packets, use the pcp-force parameter to define permit rules.
```
device(conf-macl-ext)# seq 10 permit host 0022.3333.4445 host 0022.3333.5556 pcp-force 2
```

Apply the ACL to the appropriate interface.

device(config)# interface ethernet 0/1
device(conf-if-eth-0/1)# mac access-group mac_acl2 in