Avaya Configuring Frame Relay Services Uživatelský manuál stáhnout pdf (Strana 54)

Configuring Frame Relay Services

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308624-14.10 Rev 01

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

interface. You can also redistribute buffers among the VCs and the priority queues.

The parameters that you customize at the interface level are:

• wfFrDlcmiShapingHiQueueLimit

• wfFrDlcmiShapingNormalQueueLimit

• wfFrDlcmiShapingLoQueueLimit

The parameters you can customize at the VC level are:

• wfFrCircuitShapedHiQueueLimit.

• wfFrCircuitShapedNormalQueueLimit

• wfFrCircuitShapedLoQueueLimit

For information on using the Technician Interface, see Using Technician Interface

Software.

Congestion Counters and Timers

The router determines congestion based on a specified number of FECN and

BECN bits received during a set time period (for more information, see

“Congestion Control

” on page 1-22). When congestion occurs on a traffic-shaped

VC, the router either drops traffic, throttles it, or throttles and then drops traffic,

depending on the configured congestion method.

The FECN and BECN notifications are part of the header in a frame relay data

packet. In a big pipe/little pipe topology, the central site router A typically sends

much more data than it receives (Figure 1-11)

. This means that the remote site

routers B, C, and D that receive a lot of traffic may be getting large numbers of

FECNs, while the central site router is getting relatively few data packets, and

therefore few BECNs, and is unaware that congestion is occurring.

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Avaya Configuring Frame Relay Services Uživatelský manuál Strana 54