Avaya Configuring Traffic Filters and Protocol Prioritization Manual do Utilizador descarregar pdf (Página 36)

Configuring Traffic Filters and Protocol Prioritization

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While the router is operating, network traffic from various sources converges at

each WAN interface. Without protocol prioritization, the router transmits packets

in a first in, first out (FIFO) order.

With Protocol Priority enabled on an interface, the router sorts traffic into

prioritized delivery queues (High, Normal, and Low), called priority queues. The

router uses a dequeuing algorithm to empty the priority queues to transmit traffic.

Generally, the router transmits higher-priority traffic first. Other configurable

values in the protocol prioritization scheme also affect the transmission of traffic.

Two of these values are the maximum size of the queue (queue depth) and the line

delay (latency), described in “Tuning Protocol Prioritization” on page 2-11

Protocol prioritization is considered an outbound filter mechanism for these

reasons:

• You use outbound traffic filters to specify how traffic is prioritized.

• Priority queues affect the sequence in which data leaves an interface; they do

not affect traffic as it arrives at the router.

Outbound traffic filters include prioritizing actions for specifying priority queues.

See “Prioritizing Actions” on page 4-11.

The following sections describe how the router prioritizes traffic into queues, and

the options for dequeuing:

• Priority Queuing

• The Dequeuing Process

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.

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Avaya Configuring Traffic Filters and Protocol Prioritization Manual do Utilizador Página 36