Avaya Configuring Frame Relay Services Manual de usuario descargar pdf (Pagina 62)

Configuring Frame Relay Services

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117376-C Rev. 00

Oversubscribing the Interface

The CIRs that you configure are based on an average peak rate for the VCs on the

network. If all VCs with traffic shaping try to send data simultaneously, they may

exceed the capacity of the interface. If you oversubscribe the interface, traffic

shaping will still enforce the CIR, but there may be additional latency for reserved

flows. VCs without traffic shaping will send data after traffic shaped VCs.

Queue Limits and Data Clipping

Bay Networks routers maintain buffers for each traffic shaped VC. Each buffer

can hold one frame that the router cannot send because of congestion. The router

divides the number of buffers on the interface. Some key facts specific to buffers

are:

• The default number of buffers is 200 per interface. To change the buffer

number, you can use the Technician Interface.

• The software divides the number of buffers on the interface by the number of

traffic-shaped VCs, giving each VC the same number of buffers. Therefore, if

you have 10 traffic-shaped VCs per interface, each VC has 20 buffers.

• If you enable protocol prioritization, the default number of buffers is 30 for

high priority traffic, 200 for normal, and 30 for low.

You can use the Technician Interface to increase the total number of buffers for the

interface, and you can also redistribute buffers among the VCs and among priority

queues.

The parameters that you customize at the interface level are:

• wfFrDlcmiShapingHiQueueLimit

• wfFrDlcmiShapingNormalQueueLimit

• wfFrDlcmiShapingLoQueueLimit

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 62