Avaya Configuring Frame Relay Services Manual de usuario descargar pdf (Pagina 52)

Configuring Frame Relay Services

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308624-14.10 Rev 01

If you set the B

to 16,000/2, or 1/2 CIR, the result is 8,000 bits, or a packet

size of 1,000 bytes, which works, but may result in excessive queuing because

the T

is 1/2 second. If you set the B

to 16,000/3, or 1/3 CIR, the result is a B

of 5,333 bits or 666 bytes, much closer to the 548 TFTP frame size.

• If you cannot predict the typical frame size, monitor frame relay shaping

statistics for numbers of large frames and dropped frames. If either of these

numbers is increasing constantly or dramatically, adjust the B

to a higher

value in small increments.

Using Data Compression and Traffic Shaping

Consider the following when you are configuring data compression and traffic

shaping for your network:

• Data compression maximizes throughput and increases reliability.

You can use compression effectively in the case of the 64 KB site that does not

use traffic shaping. You can also compensate for the throughput cost

associated with using compression and traffic shaping at the central site by

taking into account characteristics of compression and traffic shaping, and

fine-tuning traffic shaping parameters.

-- When you configure traffic shaping, consider the compression ratio you

want to achieve.

-- If you set the B

equal to the B

, the router doubles the amount of traffic it

attempts to send and, when you enable compression, compresses that

amount of traffic, because WCP compresses data at the rate it receives it.

-- If you also choose throttle as the congestion method, the router will queue

traffic if congestion occurs, and thus prevent exceeding the CIR.

-- Congestion may occur if compression histories are not in sync, and WCP

has to resend packets. If WCP retransmits many packets, it may exceed

the CIR.

• Traffic shaping increases reliability, controls congestion, and prioritizes

traffic.

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 52