Wide-Area Networks - CCIE Routing and Switching Exam Certification Guide - page 231

Leaky Bucket Model Figure 5-21

Token

(Represents each cell upon arrival of cell token generation)

Bucket size

Burst tolerance

Leak Rate (Can be different for each traffic type)

After the bucket is full, any new tokens represent cells that are noncompliant. Also, noncompli-
ant cells can be discarded or they can have their CLP bit set to 1.

In certain types of traffic policing, cells that are compliant in the first bucket are subjected to a
second test using a second bucket. Figure 5-22 shows this type of traffic policing.

Dual Leaky Bucket Model

Figure 5-22

T oken

Cell

If first bucket is full, Discarded

If first bucket
is not full

Bucket Size 1
CDTV Burst tolerance

PCR

Leak Rate 1 (Can be different for each traffic type)

Token

Bucket Size 2
If second bucket is full Tagged or discarded

If second bucket is not full Passes into network

Leak Rate 2