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MultiFRAD 100-Series User Guide
calculates how much information has been sent on the DLCI, and depending on the congestion
management option for a DLCI, the MultiFRAD may stop sending on that DLCI because it has
exceeded its CIR or CIR+Be rating. By changing the CIR Measurement interval, the throughput
calculations can be made more or less often.
Note: performance could be compromised if the MultiFRAD is set to calculate throughput too often.
If you click the DLCI button on the right side of the dialog box, the Frame Relay DLCI Selection
dialog box is displayed.
This dialog box shows the currently mapped DLCI as well as any DLCIs that the FR111A has
detected on the link with the frame relay switch. Click OK to continue or highlight a selected DLCI and
then click OK to change the mapped DLCI to the highlighted DLCI. The next screen is the Frame
Relay DLCI screen and it shows the current DLCI. It also shows the settings (in Bits/second) for the
Committed Information Rate and the Excess Burst Rate (Be), throughput mode, and your Congestion
Management.
To change the DLCI Number, enter the number in the Enter DLCI Number window. You do not have
to enter the leading zeros.
Congestion Management, throughput Mode, and CIR/Be settings are used to avoid congestion and
possible loss of data. The Committed Information Rate (CIR) and Excess Burst rate (Be) settings are
throughput values determined by the network and user when a DLCI is ordered. The CIR is the basic
throughput which the network will try to set aside for that DLCI. It will always be equal to or less than
the actual access rate of the physical line (i.e., if the frame relay physical link is a 56K DDS line, the
sum of the CIRs of all DLCIs on that link should not exceed 56 Kbps). The Be is the excess burst
throughput rate (added to CIR) that the network should accept for that DLCI before significant loss of
data occurs due to the discarding of frames during times of congestion. Note, however, that in frame
relay there is no absolute guarantee of a congestion-free link, regardless of CIR and Be settings.
The CIR and Be settings on the MultiFRAD should match the settings that the network has
provisioned.
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FR111A
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