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Routing & Switching · Foundational

Policing

A QoS action that enforces a rate limit by dropping or remarking traffic that exceeds it, without buffering.

Definition

Policers use token buckets and can be single-rate two-color, single-rate three-color (srTCM) or two-rate three-color (trTCM). They can be applied inbound or outbound and cause TCP retransmissions when they drop. Providers police at the ingress edge to enforce contracts.

Example

police cir 10000000 conform-action transmit exceed-action set-dscp-transmit af13

Exam tip

Policing drops or remarks with no delay; shaping buffers and adds delay. Exams love this comparison.

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