Police srtcm-color – LevelOne GTL-2691 User Manual

Page 1176

HAPTER

| Quality of Service Commands

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Policing is based on a token bucket, where bucket depth (i.e., the

maximum burst before the bucket overflows) is by specified the

committed-burst field, and the average rate tokens are added to the

bucket is by specified by the committed-rate option. Note that the

token bucket functions similar to that described in RFC 2697 and RFC

2698.

◆

The behavior of the meter is specified in terms of one token bucket (C),

the rate at which the tokens are incremented (CIR – Committed

Information Rate), and the maximum size of the token bucket (BC –

Committed Burst Size).

The token bucket C is initially full, that is, the token count Tc(0) = BC.
Thereafter, the token count Tc is updated CIR times per second as

follows:

■

If Tc is less than BC, Tc is incremented by one, else

■

Tc is not incremented.

When a packet of size B bytes arrives at time t, the following happens:

■

If Tc(t)-B ≥ 0, the packet is green and Tc is decremented by B down

to the minimum value of 0, else

■

else the packet is red and Tc is not decremented.

XAMPLE

This example creates a policy called “rd-policy,” uses the

class

command to

specify the previously defined “rd-class,” uses the

set

command to classify

the service that incoming packets will receive, and then uses the police

flow command to limit the average bandwidth to 100,000 Kbps, the burst

rate to 4000 bytes, and configure the response to drop any violating

packets.

Console(config)#policy-map rd-policy

Console(config-pmap)#class rd-class

Console(config-pmap-c)#set ip dscp 3

Console(config-pmap-c)#police flow 100000 4000 violate-action drop

Console(config-pmap-c)#

police srtcm-color

This command defines an enforcer for classified traffic based on a single

rate three color meter (srTCM). Use the no form to remove a policer.

YNTAX

[no] police {srtcm-color-blind | srtcm-color-aware}

committed-rate committed-burst excess-burst

exceed-action {drop | new-dscp}

violate action {drop | new-dscp}
srtcm-color-blind - Single rate three color meter in color-blind

mode.
srtcm-color-aware - Single rate three color meter in color-aware

mode.