Chapter 23
| Quality of Service Commands
ā 652 ā
police flow This command defines an enforcer for classified traffic based on the metered flow
rate. Use the no form to remove a policer.
Syntax
[no] police flow committed-rate committed-burst
conform-action transmit
violate-action {drop| new-dscp}
committed-rate
- Committed information rate (CIR) in kilobits per second.
(Range: 0-10000000 kbps at a granularity of 64 kbps or maximum port
speed, whichever is lower)
committed-burst
- Committed burst size (BC) in bytes.
(Range: 64-16000000 at a granularity of 4k bytes)
conform-action - Action to take when packet is within the CIR and BC.
(There are enough tokens to service the packet, the packet is set green).
violate-action - Action to take when packet exceeds the CIR and BC. (There
are not enough tokens to service the packet, the packet is set red).
transmit - Transmits without taking any action.
drop - Drops packet as required by violate-action.
new-dscp - Differentiated Service Code Point (DSCP) value. (Range: 0-63)
Default Setting
None
Command Mode
Policy Map Class Configuration
Command Usage
ā You can configure up to 16 policers (i.e., class maps) for ingress ports.
ā The
committed-rate
cannot exceed the configured interface speed, and the
committed-burst
cannot exceed 16 Mbytes.
ā 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.
ā The behavior of the meter is specified in terms of one token bucket (C), the rate
at which the tokens are incremented (CIR ā Committed Information Rate), and
the maximum size of the token bucket (BC ā 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:
ā
If Tc is less than BC, Tc is incremented by one, else
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