User Manual UMN:CLI
V5808
185
Removes the policer from policy.
7.5.4.2 Metering
Meters measure the temporal state of a flow or a set of flows against a traffic profile. In
this event, a meter might be used to trigger real-time traffic conditioning actions (e.g.
marking, policing, or shaping).
Typical parameters of a traffic profile are:
• Committed Information Rate (CIR)
• Peak Information Rate (PIR)
• Committed Burst Size (CBS)
• Excess Burst Size (EBS)
• Peak Burst Size (PBS)
A typical meter measures the rate at which traffic stream passes it. Its rate estimation
depends upon the flow state kept by the meter. There is a time constraint during which if
the flow state is transferred from the old switch to the new switch, then it is effective in
estimating the rate at the new switch as if though no transfer of flow has happened.
The V5808 provides Token Bucket (srTCM and trTCM) meters.
Token Bucket
The token bucket is a control mechanism that transmits traffic by tokens in the bucket.
The tokens are consumed by transmitting traffic and regenerated at the given rate. If all
tokens in the bucket are consumed out, traffic cannot be transmitted any more; a flow can
transmit traffic up to its peak burst rate. The transmitting cost and regenerating rate of
tokens are configurable.
Token
Packet
Packet consumes
tokens in the bucket
Forwarding
Tokens are regenerated
at a given rate (CIR, PIR)
CBS
EBS
PBS
Token
Fig. 7.3 Token Bucket Meter
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