3Com 7757 Configuration Manual page 662

3com switch 7750 family

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ONFIGURATION

Figure 173 Evaluate the traffic with the token bucket

Packets to be sent

through this port

classification

1 Evaluate the traffic with the token bucket

The evaluation for the traffic specification is based on whether the number of

tokens in the bucket can meet the need of packet forwarding. If the number of

tokens in the bucket is enough to forward the packets (generally, one token is

associated with a 1-bit forwarding authority), the traffic is conforming to the

specification, and otherwise the traffic is nonconforming or excess.

When the token bucket evaluates the traffic, its parameter configurations include:

Average rate: The rate at which tokens are put into the bucket, namely, the

permitted average rate of the traffic. It is generally set to committed

information rate (CIR).

Burst size: The capacity of the token bucket, namely, the maximum traffic size

that is permitted in every burst. It is generally set to committed burst size (CBS).

The set burst size must be bigger than the maximum packet length.

One evaluation is performed on each arriving packet. In each evaluation, if the

number of tokens in the bucket is enough, the traffic is conforming to the

specification and you must take away some tokens whose number is

corresponding to the packet forwarding authority; if the number of tokens in the

bucket is not enough, it means that too many tokens have been used and the

traffic is excess.

2 Complicated evaluation

You can set two token buckets in order to evaluate more complicated conditions

and implement more flexible regulation policies. For example, TP includes 4

Peak information rate (PIR)

Excess burst size (EBS)

Put tokens in the bucket at the

Troubleshooting

7750 7758 7754