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How the Rate-Limiting Feature Works

You use rate limiting with gates. To enable rate limiting for a gate, you need to provide traffic management package (TMAN) parameters. You can configure these parameters in the CLI or they can come from the PGCP signaling commands received from the PGC. Traffic-management parameters that come from the PGC override parameters configured in the CLI.

Table 9: Traffic Parameters Configured in the CLI

Parameter	Description	Equivalent PGCP Signaling Command
Sustained data rate (SDR)	Provides the CIR	Tman/sdr
Peak data rate (PDR)	Provides the PIR	Tman/pdr
Maximum burst size (MBS)	Provides the burst size. Both the CBS and the PBS defined in RFC 2698 map to the maximum burst size.	Tman/mbs

For each of the traffic-management parameters, you can configure a default value that applies to all gate streams and value that applies only to RTCP gate streams. For RTCP streams, you can specify a fixed value for the parameters or you can specify the value as a percentage of the RTP rate. When RTP and RTCP are represented as a single stream, RTCP is policed whenever RTP is policed.

The PGC can send traffic-management parameters to the packet gateway in PGCP gate open and gate modify signaling requests. When the services PIC receives these parameters, it marks the packets red, yellow, or green as specified in RFC 2698. A packet is marked red if it exceeds the PIR. A packet is marked yellow if it exceeds the CIR. A packet is marked green if it does not exceed the CIR. Packets that are marked red are dropped by the services PIC.

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