Avaya Configuring Frame Relay Services Manual de usuario descargar pdf (Pagina 51)

Frame Relay Overview

308624-14.10 Rev 01

1-29

For throughput, an SVC may process less throughput than it requests because the

local router, the frame relay network, and the remote end of the connection

negotiate quality of service. You can use the LL core minimum outgoing and

minimum incoming throughput values to set the lowest throughput value the

router will accept. If either the local router, the network, or the remote end cannot

guarantee that value, the SVC will not be established.

To customize incoming and outgoing data flow and throughput, see “Customizing

Traffic Shaping Quality of Service” on page 5-35.

Traffic Shaping Configuration Notes for PVCs and SVCs

Traffic shaping is best used at central offices to prevent the “big pipe” from

sending too much data too quickly to remote sites with “little pipes.” This concept

should guide your decisions about how to configure traffic shaping.

CIR Configuration Guidelines

Consider the following when you configure traffic shaping:

• In general, the value you assign to the B

should equal 1/4 of the CIR to avoid

excessive queuing and dropped packets.

If, however, you are sending frames that exceed the size of the B

, data travels

slowly because the router must use multiple time periods to accommodate the

packet size and avoid exceeding the CIR. If setting the B

to 1/4 of the CIR

yields a value lower than packet size, set the B

to 1/3 or even 1/2 of the CIR.

For example, a typical TFTP frame is 548 bytes. If the CIR is 16,000 bits, the

configured according to the 1/4 guideline would be 4,000 bits, or 500

bytes, which is not big enough to accommodate a TFTP frame.

Table 1-6. Incoming and Outgoing

Call Originator Direction of Data Parameters that Apply

Local router Outgoing to remote router Outgoing

Incoming from remote router Incoming

Remote router Incoming to local router Outgoing

Outgoing from local router Incoming

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 51