Avaya Configuring Frame Relay Services Instrukcja Użytkownika Pobierz pdf (Strona 45)

Frame Relay Overview

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For example, suppose you set the congestion timer to 0.5 second and the

congestion count to 3. In this case, if an interface receives three FECNs or BECNs

within 0.5 second, the node stops sending frames (although it continues to receive

frames for this PVC). If the interface receives no FECNs or BECNs during the

next 0.5 second, the router resumes transmission.

If you enable congestion control and also enable traffic shaping, you can throttle,

which means queue, congested traffic rather than lose it. Throttle is one of the

options for the congestion method.

For instructions on configuring the congestion parameters, see “Controlling

Congestion for PVCs” on page 4-15 and “Controlling Congestion for SVCs” on

page 5-26.

Traffic Shaping

Traffic shaping relieves bottlenecks in topologies with high-speed connections to

the central site, and low-speed connections at remote sites (Figure 1-8

on page

1-20

). Committed information rate enforcement and quality of service are the

major components of Nortel Networks traffic shaping.

Committed Information Rate

The committed information rate (CIR) is the rate at which the network supports

data transfer under normal operations. Its name is descriptive: you have a contract

with your carrier, who has committed to providing a given throughput, here called

the committed information rate. The CIR is measured in bits per second. You

configure this value that the carrier provides per virtual circuit.

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Avaya Configuring Frame Relay Services Instrukcja Użytkownika Strona 45