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Configuring a Policer

To configure an Ethernet policer profile, include the ethernet-policer-profile statement at the [edit interfaces interface-name gigether-options ethernet-switch-profile] hierarchy level:



[edit interfaces interface-name gigether-options
ethernet-switch-profile]

ethernet-policer-profile {



policer cos-policer-name {



aggregate {

bandwidth-limit bps;

burst-size-limit bytes;
}





premium {

bandwidth-limit bps;

burst-size-limit bytes;
}


}


}

In the Ethernet policer profile, the aggregate-priority policer is mandatory; the premium-priority policer is optional.

For aggregate and premium policers, you specify the bandwidth limit in bits per second. You can specify the value as a complete decimal number or as a decimal number followed by the abbreviation k (1000), m (1,000,000), or g (1,000,000,000). There is no absolute minimum value for bandwidth limit, but any value below 61,040 bps will result in an effective rate of 30,520 bps. The maximum bandwidth limit is 4.29 Gbps.

The maximum burst size controls the amount of traffic bursting allowed. To determine the burst-size limit, you can multiply the bandwidth of the interface on which you are applying the filter by the amount of time you allow a burst of traffic at that bandwidth to occur:




burst size = bandwidth x allowable time for burst traffic

If you do not know the interface bandwidth, you can multiply the maximum MTU of the traffic on the interface by 10 to obtain a value. For example, the burst size for an MTU of 4700 would be 47,000 bytes. The burst size should be at least 10 interface MTUs. The maximum value for the burst-size limit is 100 MB.

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