Enter configure mode.

Configure bridge 1 as mstp aware.

Enter interface mode.

Configure xe2 as a Layer 2 port.

Associate bridge to an interface.

Configure port as a trunk.

Allow all the VLANs on the xe2 interface.

Exit the xe2 interface mode.

Enable QoS globally.

Enable QoS statistics.

Enter Class-map mode

Configure match criteria as CoS with Value 3

Exit Class-map mode

Enter policy-map mode

Assign Class 1234 to Policy-map 1234

Police access-list 102 frames @ Committed information rate 2 mbps, committed bust 2 mbyte, peak information rate 3 mbps, peak burst 2 mbytes when traffic is > CIR and <= PIR then Set the class of service (CoS) field to 1, if traffic violate the action then drop the frames.

Exit out of policy-class-map mode

Exit out of Policy-map mode

Enter xe2 interface

Assign service-policy to interface on in-direction

Enter interface mode.

Configure xe3 as a Layer 2 port.

Associate bridge to an interface.

Configure port as a trunk.

Allow all the VLANs on the xe3 interface.

Exit the xe3 interface mode.

Configure mac access-list with action

Permit when frames matches Source mac address 00:00:01:01:10:10 and destination mac address 00:00:02:02:20:20

Exit mac access-list mode

Enter Class-map mode

Configure match criteria as access-group 102

Exit Class-map mode

Enter policy-map mode

Assign Class 2345 to Policy-map 2345

Police access-list 102 frames @ Committed information rate 2 mbps, committed bust 2 mbytes, peak information rate 3 mbps, peak burst 2 mbytes when traffic is > CIR and <= PIR, then set the class of service (CoS) field to 1, if traffic violate the action, then drop the frames.

Exit Policy-class mode

Exit Policy-map mode

Enter interface mode.

Assign service-policy 2345 to interface on in-direction

Committing the configured line

Exit interface mode