
Using Protocol Prioritization Queues
117348-A Rev. A 2-7
Strict Dequeuing Algorithm
Instead of the bandwidth allocation algorithm, you can configure the router to use
the strict dequeuing algorithm to send traffic to the transmit queue.
The strict dequeuing algorithm works as follows:
1. The transmit queue scans the High queue.
If there is no traffic in the High queue, the algorithm proceeds to step 4
.
2. The router empties all packets from the High queue into the transmit queue,
up to the latency value or the maximum transmit queue size, and then
transmits the packets.
The transmit queue size is the maximum number of packets in the transmit
queue at one time. You cannot configure this number using Site Manager.
3. If the latency value is reached, the transmit queue returns to step 1, scanning
and emptying traffic from the High queue.
If neither the latency value nor the maximum transmit queue size is reached,
the algorithm proceeds to step 4
.
4. The transmit queue scans the Normal queue.
If there is no traffic in the Normal queue, the algorithm proceeds to step 7
.
5. The router empties all packets from the Normal queue, up to the latency value,
into the transmit queue and then transmits the packets.
6. If the latency value is reached, the transmit queue returns to step 1, scanning
and emptying traffic from the High queue.
If the latency value is not reached, the algorithm proceeds to step 7
.
7. The transmit queue scans the Low queue.
If there is no traffic in the Low queue, the algorithm returns to step 1
.
8. The router empties all packets from the Low queue, up to the latency value,
into the transmit queue and then transmits the packets.
9. The algorithm returns to step 1, whether or not the latency value is reached.
Caution: If the router uses the strict dequeuing algorithm and there is a great
deal of High queue traffic on the network, Normal and Low queue traffic may
never be transmitted.
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