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Configuring ATM2 IQ Real-Time VBR

By default, ATM interfaces use UBR; that is, bandwidth utilization is unlimited. For ATM2 IQ interfaces only, you can configure RTVBR, which supports variable bit rate data traffic with average and peak traffic parameters. Compared to non-real-time VBR, RTVBR data is serviced at a higher priority with a relatively small sustainable cell rate (SCR) limit to minimize the delay. Real-time VBR is suitable for carrying packetized video and audio.

To configure RTVBR, include the rtvbr statement:




rtvbr peak rate sustained rate burst length;

For a list of hierarchy levels at which you can include this statement, see rtvbr.

When configuring RTVBR, you can define the following shaping properties:

Peak rate—Top rate at which traffic can burst.
Sustained rate—Normal traffic rate averaged over time.
Burst length—Maximum number of cells that a burst of traffic can contain. It can be a value from 1 through 4000 cells.

The peak and sustained rates can be from 33 Kbps through 542,526,792 bps.

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