JUNOSe 7.2.x Policy Management Configuration Guide
96 ! Two-Rate Rate-Limits
committed-burst
! Use to set the committed burst in bytes for a rate-limit profile; range is
1–4294967295.
! When you specify a nonzero value for the rate, the burst size is automatically
calculated for a 100-ms burst as described for the committed-rate command. If
the calculated burst size is less than the default value of 8 KB, the default value
(8192 bytes) is used.
! During a software upgrade, the committed burst size in a rate-limit profile is
automatically set to 8192 bytes if it was less than that value before the upgrade.
! Example
host1(config-rate-limit-profile)#committed-burst 1500000
! Use the no version to restore the default value, 8192 bytes.
committed-rate
! Use to set the committed rate in bits per second for a rate-limit profile; range is
1–4294967295.
! When you specify a nonzero value for the committed rate, the committed burst
size is calculated based on a 100-ms burst as follows:
committed burst in bytes = (committed rate in bps x 100 ms) ÷ 8 bits per byte
The router displays committed rate in bits per second and committed 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:
committed burst = (8,000,000 bps x 100 ms) ÷ 8 = 100,000 bytes
For this example, displaying the rate-limit profile shows:
committed-rate 8000000
committed-burst 100000
If the calculated burst value is less than the default burst size of 8 KB, the
default burst size is used. For most configurations this value probably is
sufficient, making it optional for you to configure a value for the associated
committed burst size.
! Example
host1(config-rate-limit-profile)#committed-rate 800000
! Use the no version to restore the default value, 0.
NOTE: We recommend that you do not configure a committed or peak burst size
smaller than the MTU of the interface. Doing so causes large packets to be
dropped even when they are transmitted at a very low rate.
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