Planet Technology IDL-2402 - Manual (Page 121)

„ Rate Limit Policer profile
The IDL-2402 supports two kinds of TCM Policer: two-rate TCM (with dual leaky buckets)
and single-rate TCM (with single leaky bucket).
The single-rate TCM meters a traffic stream and marks its packets according to
Committed Information Rate (CIR) and Committed Burst Size (CBS) to be either green,
or red. The single-rate TCM operates with a single leaky bucket that is updated according
to only one rate, the committed information rate - CIR. A packet is marked green if the
leaky bucket is not full and red otherwise.
The two-rate TCM meters a traffic stream and marks its packets based on two rates,
Committed Information Rate (CIR) and Excess Information Rate (EIR), and their
associated burst sizes, Committed Burst Size (CBS) and Excess Burst Size (EBS), to be
either green, yellow, or red. The two-rate TCM operates with dual leaky bucket, where
each bucket is updated according to a different rate. The first bucket is updated
according to the CIR, the second bucket is updated according to the EIR. A packet is
marked red if it exceeds the PIR. Otherwise it is marked either yellow or green depending
on whether it exceeds or doesn’t exceed the EIR.
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