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Bandwidth Policer Overview

Guidelines for Configuring a Bandwidth Policer

• To specify a percentage bandwidth limit, you include the bandwidth-percent percentage statement in place of the bandwidth-limit bps statement.
• By default, a bandwidth policer calculates the percentage bandwidth limit based on the physical interface port speed. To configure a bandwidth policer to calculate the percentage bandwidth limit based on the configured logical interface shaping rate instead, include the logical-bandwidth-policer statement at the [edit firewall policer policer-name] hierarchy level. This type of bandwidth policer is called a logical bandwidth policer.

  You can configure a logical interface shaping rate by including the shaping-rate bps statement at the [edit class-of-service interfaces interface interface-name unit logical-unit-number] hierarchy level. A logical interface shaping rate causes the specified amount of bandwidth to be allocated to the logical interface.

  Note: If you configure a logical-bandwidth policer and then apply the policer to a logical interface that is not configured with a shaping rate, then the policer rate-limits traffic on that logical interface to calculate the percentage bandwidth limit based on the physical interface port speed, even if you include the logical-bandwidth-policer statement in the bandwidth policer configuration.

• If you reference a bandwidth policer from a stateless firewall filter term, you must include the interface-specific statement in the firewall filter configuration.

Guidelines for Applying a Bandwidth Policer

• You can use a bandwidth policer to rate-limit protocol-specific traffic (not family any) at the input or output of a logical interface.
• You can apply a bandwidth policer directly to protocol-specific input or output traffic at a logical interface.

• To send only selected packets to a bandwidth policer, you can reference the bandwidth policer from a stateless firewall filter term and then apply the filter to logical interface traffic for a specific protocol family.

  • To reference a logical bandwidth policer from a firewall filter, you must include the interface-specific statement in the firewall filter configuration.
  • You cannot use a bandwidth policer for forwarding-table filters.
• You cannot apply a bandwidth policer to an aggregate interface, a tunnel interface, or a software interface.