Avaya Configuring Frame Relay Services Manual de usuario descargar pdf (Pagina 55)

Frame Relay Overview

117376-C Rev. 00

2-25

The sum of the B

and the B

is the maximum amount of traffic that can travel

across the network per T

when there is no congestion. If you set the B

to a value

greater than zero, the router can send traffic exceeding the CIR. To enforce the

CIR, that is, to limit traffic that the router can send to the amount of the CIR, set

the B

to 0.

If you enable congestion control and set the congestion method to throttle, the

virtual circuit sends only B

bits of data over the time interval T

when congestion

occurs, even if you have configured the B

to a value greater than 0. It queues the

excess data until congestion abates. If you set the congestion method to

throttle-then-shutdown, the virtual circuit first queues traffic when congestion

occurs, and then terminates the virtual circuit if throttling does not alleviate

congestion.

Quality of Service

Quality of Service (QoS) is the second major component of Bay Networks traffic

shaping. It uses protocol prioritization with traffic shaping. You configure a

prioritization filter on the default service record for the entire frame relay

interface, and CIR enforcement per virtual circuit (VC). QoS operates over

Synchronous, HSSI, T1, E1, and ISDN lines, for backup, demand, and for leased

lines. Although the HSSI driver does not support protocol prioritization, VCs on

an HSSI interface do.

Using protocol prioritization with traffic shaping creates two levels of queues. For

traffic shaping the queues are high/normal/low at the VC level. For protocol

prioritization they are interrupt/shaping/high/normal/low at the driver level.

Figure 2-10

illustrates this concept.

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 55