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Two-Rate Rate-Limits ! 99

Chapter 3: Creating Rate-Limit Profiles

! Use the following mask values to set the appropriate bits in the ToS field of the

IP packet header or in the traffic class field of the IPv6 packet header:

! IP precedence—0xE0 (three most significant bits)

! DS field—0xFC (six most significant bits)

! TOS (IP) or Traffic Class field (IPv6)—0xFF (default)

! Example

host1(config-rate-limit-profile)#mask-val 0xFC

! Use the no version to restore the default value, 255.

peak-burst

! For two-rate rate-limit profiles only, use to set the peak burst in bytes for a

rate-limit profile; range is 1–4294967295.

! When you specify a nonzero value for the peak rate, the peak burst size is

automatically calculated for a 100-ms burst as described for the peak-rate

command. If the calculated peak burst size is less than the default value of 8192

bytes, the default value 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)#peak-burst 96256

! Use the no version to restore the default value, 8192 bytes.

peak-rate

! For two-rate rate-limit profiles only, use to set the peak rate in bits per second

for a rate-limit profile; range is 1–4294967295.

! 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

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.

Juniper E Series Configuration Guide

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