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# Setting the Peak Rate for Rate-Limit Profiles

For two-rate rate-limit profiles only, you can use the peak-rate command to set the peak rate in bits per second for a rate-limit profile; range is 1–4294967295. Use to set the peak rate as a percentage value; range is 0–100. During a software upgrade, the peak rate in a rate-limit profile is automatically set to 0 if it was nonzero but less than the committed rate before the upgrade. The no version to restores the default value, 0.

When you specify a nonzero value for the peak rate, the peak burst size is calculated based on a 100-ms burst as follows:

`

peak burst in bytes = (peak rate in bps x 100 ms) ÷ 8 bits per byte

`

The CLI displays peak rate in bits per second and peak burst in bytes. For example, if the rate is 8 Mbps, the burst size is 100 ms x 8 Mbps = 800,000 bits or 100,000 bytes:

`

peak burst = (8,000,000 bps x 100 ms) ÷ 8 = 100,000 bytes

`

For this example, displaying the rate-limit profile shows:

`

peak-rate 8000000
peak-burst 100000

`

If the calculated peak burst value is less than the default peak burst size of 8 KB, the default burst size is used. For most configurations this value is probably sufficient, making it optional to configure the associated peak burst size.

- Issue the peak-rate command in Rate Limit Profile Configuration mode to set the peak rate:
  `
  host1(config-rate-limit-profile)#peak-rate refRlpRate percentage 100
  `

#### Related Topics

- peak-rate

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