
Using Protocol Prioritization Queues
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Priority Queuing
With protocol prioritization enabled on an interface, the router sends each packet
leaving an interface to one of three priority queues:
• High queue
• Normal queue
• Low queue
The router automatically queues packets that do not match a priority filter to the
Normal queue. To send traffic to the other queues, you create outbound traffic
filters that include a prioritizing action. These are called priority filters.
The Dequeuing Process
After queuing packets, the router empties the priority queues by sending the traffic
to the transmit queue using one of two dequeuing algorithms:
• Bandwidth Allocation Algorithm
• Strict Dequeuing Algorithm
By default, protocol prioritization uses the bandwidth allocation algorithm to send
traffic from the three priority queues to the transmit queue. You specify the active
dequeuing algorithm by setting the Prioritization Algorithm Type parameter, as
described in “Editing Protocol Prioritization Parameters” on page 2-15.
Figure 2-1 illustrates the dequeuing process, with default configuration values.
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