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In the realm of network service level agreements (SLAs), a customer often commits to a certain level of service for their clients. This may necessitate limiting bandwidth at the Layer 3 sub-interface level. Currently, egress service policies can achieve bandwidth control, but ingress control lacks a similar mechanism.

Policy-map counters can be configured to display per-interface counters for all class-maps attached to all successfully programmed policy-maps. The feature is not enabled by default and has to be configured through the command line interface. When enabled, the output of the show command will display both per-interface and aggregate counters.

In Tap Aggregation mode, an interface can be configured as tap or tool port. Tap ports are used to 'tap' the traffic and