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Using DLSw Prioritization

6-7

Tuning DLSw Protocol Prioritization

This section explains how congestion control and queue depth affect DLSw

prioritization results for your network. The sections “Customizing the Default

Queue Conﬁguration” and “Customizing Speciﬁc DLSw Peer Queues” later in

this chapter show how to use Conﬁguration Manager to conﬁgure these values.

DLSw Priority Queues and Congestion Control

Because the router cannot clip DLSw trafﬁc without breaking the DLSw session,

DLSw protocol prioritization includes an internal congestion control feature to

• Temporarily save overﬂow packets in memory until the appropriate priority

queue can handle them

• Notify DLSw to stop and start the ﬂow of packets

There must be sufﬁcient memory available to congestion control to prevent

clipping. The less the congestion, the better the queue performance.

Queue Depth

Using Site Manager parameters, you conﬁgure the maximum queue buffers and

the percentage of bandwidth for each queue.

Queue depth is the conﬁgurable number of packets that each DLSw priority queue

can hold. The default value is 50 packets, regardless of packet size.

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

DLSw queues. To determine whether there are enough buffers for the DLSw

trafﬁc ﬂow on your network, examine the following two protocol prioritization

statistics which the router keeps for each DLSw priority queue:

• DLSw HiWater Packets Mark — The greatest number of packets that have

been in each queue.

• DLSw Congestion Control Count — The number of packets the router has

discarded from each queue. (The router discards packets from full priority

queues.)

Generally, if a queue’s Congestion Control Count is high, and its HiWater Packets

Mark is close to or equal to its queue depth, you have not assigned enough buffers

to that queue.

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Avaya Configuring DLSw Services Manual do Utilizador Página 161