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Configuring the Accounting of Policer Overhead in Interface Statistics

The Metro Ethernet Forum (MEF) Carrier Ethernet (CE) 2.0 set of standards has stringent requirements to the bandwidth profile enforcement at the user-to-network interfaces (UNI). MEF CE 2.0 certification compliance allows only a 2 percent deviation from UNI committed or peak rate across all frame sizes. This means that the policers should take into account the frame size at the UNI interface, including frame checksum and excluding all additional overheads that might be added inside the service provider network (such as S-VLANs).

In order to address the MEF CE 2.0 stringent requirements to the bandwidth profile, policer-overhead adjustment is defined on a per IFL or direction granularity. The policer-overhead adjustment is in the range of -16 bytes to +16 bytes and is applied for all the policers that take into account Layer 1/ Layer 2 (L1/L2) packet length in the specified IFL or direction, including corresponding logical interface family (IFF) feature policers.

To configure the policer-overhead:

  1. At the [edit interfaces] hierarchy level in configuration mode, create the interface on which to add the policer-overhead to input or output traffic.

    For example:

  2. Create the unit on which to add the policer overhead.

    For example:

  3. Configure the policer-overhead for the ingress policer.

    For example:

  4. Configure the policer-overhead for the egress policer.

  5. Verify the configuration.