Avaya Configuring Traffic Filters and Protocol Prioritization Instrukcja Użytkownika Pobierz pdf (Strona 44)

Configuring Traffic Filters and Protocol Prioritization

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When you set the queue size, you assign buffers (which hold the packets) to each

queue. A queue is full when it exceeds buffer size. The router discards (clips)

trafﬁc sent to a full queue.

Queue Depth Example

Suppose that you use the default queue depth (20 packets) for all three priority

queues. You then see from the statistics that the high-priority queue’s Clipped

Packets Count is 226, and its High Water Packets Mark is 20. These statistics

indicate that the high-priority queue has been full at least once and that the router

has discarded 226 packets.

From this information you can conclude that you have not assigned enough

buffers to the high-priority queue for the amount of high-priority trafﬁc on this

interface.

To prevent further high-priority trafﬁc from being discarded, you can reconﬁgure

the depth of the queues or re-evaluate the amount of trafﬁc assigned to the

high-priority queue.

Reconﬁguring Queue Depth

Suppose that you now look at the statistics of the normal- and low-priority queues

and find that the low-priority queue has a Clipped Packets Count of zero, and a

High Water Packets Mark of 06 (Figure 2-4). Thus, there have never been more

than six packets in the low-priority queue, and the router has not discarded any

low-priority packets.

Note: The buffer size for priority queues is not conﬁgurable when using the

strict dequeuing algorithm.

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Avaya Configuring Traffic Filters and Protocol Prioritization Instrukcja Użytkownika Strona 44