H3C S7500 Series Operation Manual page 694

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Operation Manual – QoS

H3C S7500 Series Ethernet Switches

Packets to be sent through

an interface

Figure 1-4 Evaluate the traffic with the token bucke

Evaluate the traffic with the token bucket

Traffic specification evaluation 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. 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

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

of every burst traffic. 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 to forward the packet, the packet is conforming to the

specification and you must take away some tokens whose number corresponds to the

packet forwarding authority; if the number of tokens in the bucket is not enough to

forward the packet, it means that too many tokens have been used and the traffic is

Complicated evaluation

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

conditions and implement more flexible traffic control policies. For example, the

following 4 parameters are set for TP:

Tokens are input into the

token bucket at a given ra

Chapter 1 QoS Configuration

Packets sent

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