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Using DLSw Prioritization

6-5

The Dequeue List

Three factors determine a packet’s weighted score:

• Size of the packet

• Percent of bandwidth allocated to the packet’s queue

• Time spent in the dequeue list

The dequeuing algorithm calculates a packet’s dequeue weight using the

following formula:

Weighted Dequeuing Algorithm

Weighted dequeuing works as follows:

1. Each priority queue enters its ﬁrst (oldest) entry on a dequeue list.

2. The dequeue list orders the packets according to a weighted score.

3. TCP requests DLSw packets.

4. The router sends the requested number of packets or bytes to TCP from the

top of the dequeue list, up to the conﬁgured queue limit.

5. TCP transmits the packets.

6. The sequence repeats at Step 1.

Figure 6-1 illustrates weighted dequeuing.

Weight =

Size of packet

Bandwidth %

- Time in dequeue list

1 2 ... 154 155 156 157 158 159 160 161 162 163 164 ... 203 204

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