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• You cannot apply a class-map and QoS policies to the same interface.
• You cannot apply an input Layer 2 QoS policy on an interface you also configure with vlan-stack
access.
• If you apply a service policy that contains an ACL to more than one interface, the system uses ACL
optimization to conserve CAM space. The ACL optimization behavior detects when an ACL exists in
the CAM rather than writing it to the CAM multiple times.
• Apply an input policy map to an interface.
INTERFACE mode
service-policy input
Specify the keyword layer2 if the policy map you are applying a Layer 2 policy map; in this case,
INTERFACE mode must be in Switchport mode.
Creating Output Policy Maps
Creating output policy maps is supported only on the E-Series and S4810 platforms.
1. Create an output policy map.
CONFIGURATION mode
policy-map-output
2. After you create an output policy map, do one or more of the following:
Applying an Output QoS Policy to a Queue
Specifying an Aggregate QoS Policy
Applying an Output Policy Map to an Interface
3. Apply the policy map to an interface.
Applying an Output QoS Policy to a Queue
To apply an output QoS policy to a queue, use the following command.
• Apply an output QoS policy to queues.
INTERFACE mode
service-queue
Specifying an Aggregate QoS Policy
To specify an aggregate QoS policy, use the following command.
• Specify an aggregate QoS policy.
POLICY-MAP-OUT mode
policy-aggregate
Applying an Output Policy Map to an Interface
To apply an output policy map to an interface, use the following command.
• Apply an input policy map to an interface.
INTERFACE mode
service-policy output
734
Quality of Service (QoS)