Avaya Configuring Traffic Filters and Protocol Prioritization Manual do Utilizador descarregar pdf (Página 37)

Using Circuit-level Protocol Prioritization

2-3

By default, protocol prioritization uses the bandwidth allocation algorithm to send

trafﬁc to the transmit queue. This is because if the router uses the strict dequeuing

algorithm and there is a great deal of high-priority trafﬁc on the network, the

normal- and low-priority trafﬁc may never get transmitted.

You specify the active dequeuing algorithm as described in the section “Editing

Protocol Prioritization Parameters” later in this chapter.

Bandwidth Allocation Algorithm

The bandwidth allocation algorithm uses a conﬁgurable percentage of bandwidth

for each of the three priority queues to determine how to transmit queued trafﬁc.

The default conﬁguration is

• HighQ — 70% of bandwidth

• NormalQ — 20% of bandwidth

• LowQ — 10% of bandwidth

When the amount of trafﬁc transmitted from a particular queue reaches the

conﬁgured percentage, the next priority queue begins to transmit trafﬁc.

The amount of actual data transmitted depends on the clock speed of the circuit.

You can conﬁgure the clock speed on a synchronous interface by setting the

External Clock Speed parameter in the Conﬁguration Manager Edit Sync

Parameters window. Refer to Conﬁguring Line Services.

The bandwidth allocation algorithm works as follows:

1. The transmit queue scans the high-priority queue.

If there is no trafﬁc in the high-priority queue, the algorithm proceeds to

Step 3.

2. The router empties all packets from the high-priority queue, up to the

conﬁgured bandwidth percentage, into the transmit queue and transmits

them.

The default bandwidth percentage for high-priority trafﬁc is 70 percent. If the

actual bandwidth use is less than the limit, the router empties the high-priority

queue and proceeds to the normal-priority queue.

3. The transmit queue scans the normal-priority queue.

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Avaya Configuring Traffic Filters and Protocol Prioritization Manual do Utilizador Página 37