C
HAPTER
38
| Quality of Service Commands
– 891 –
■
set cos command sets the class of service value in matching
packets. (This modifies packet priority in the VLAN tag.)
■
police commands define parameters such as the maximum
throughput, burst rate, and response to non-conforming traffic.
◆ Up to 16 classes can be included in a policy map.
EXAMPLE
This example creates a policy called “rd-policy,” uses the class command
to specify the previously defined “rd-class,” uses the set phb 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 4,000 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 phb 3
Console(config-pmap-c)#police flow 10000 4000 conform-action transmit
violate-action drop
Console(config-pmap-c)#
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 | new-dscp}
violate-action {drop| new-dscp}
committed-rate
- Committed information rate (CIR) in kilobits per
second. (Range: 64-1000000 kbps at a granularity of 64 kbps or
maximum port speed, whichever is lower)
committed-burst
- Committed burst size (BC) in bytes.
(Range: 4000-16000000 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)
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