Avaya Configuring Traffic Filters and Protocol Prioritization Manuale Utente Pagina 36

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Configuring Traffic Filters and Protocol Prioritization
2-2 117348-A Rev. A
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 “T
uning Protocol Prioritization” later in this chapter.
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 “Pr
ioritizing Actions” in Chapter 4.
The following sections describe how the router prioritizes traffic into queues, and
the options for dequeuing:
•“Priority Queuing
•“T
he 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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