Information Technology Reference
In-Depth Information
Traffic conforms to, exceeds (uses excess burst), or violates (is over and above the excess burst) the contract. Actions can be
specified for traffic that conforms, exceeds, or violates the contract.
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Two-rate, three-color policer (RFC 2698):
Two token buckets are used, with tokens periodically added to both buckets.
Traffic conforms to the contract, exceeds the contract but still conforms to a second rate, or violates the contract.
The following example contains a sample single-rate, three-color policer:
policy-map
1rate-3color
class class-default
police cir
32000
bc
1500
be
1500
conform-action
set-dscp-transmit af31
exceed-action
set-dscp-transmit af32
violate-action drop
In the example, the
police cir
cir
bc
bc
be
be
conform-action
action
exceed-action
action
violate-action
action
command
configures a policer for traffic assigned to class-default, and specifies a committed information rate (CIR) of 32 Kbps, a committed
burst (Bc) of 1500 bytes, and an excess burst (Be) of 1500 bytes. Packets that conform have their DSCP field set to AF31 and are
transmitted; packets that exceed have their DSCP field set to AF32 and are transmitted; and packets that violate are dropped.
Note that when configuring a single-rate three-color policer, the CIR is configured in bits per second and the Bc and Be are
configured in bytes.
The following example shows a sample configuration of a two-rate, three-color policer:
policy-map
2rate-3color
class class-default
police cir 20000 bc 10000 pir 40000 be 10000 conform-action transmit exceed-action set-dscp-transmit af33
violate-action drop
The
police cir
cir
bc
conform-burst
pir
pir
be
peak-burst
conform-action
action
exceed-action
action
violate-action
action
command configures a policer for traffic in class-default, and specifies a CIR of 20 Kbps, a Bc of 10,000 bytes, a peak information
rate (PIR) of 40 Kbps, and a Be of 10,000 bytes. Packets that conform have their DSCP field set to AF31 and are transmitted; packets
that exceed have their DSCP field set to AF32 and are transmitted; and packets that violate are dropped.
When configuring a two-rate three-color policer, the CIR and PIR are configured in bits per second, and the Bc and Be are configured
in bytes.
