Beta Draft Confidential
10-46
1/19/05
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring ATM PVCs
Configuring Frame Relay-to-ATM Interworking Circuits
Graceful Discard
The Graceful Discard feature enables you to control network behavior and user traffic.
You can set the graceful discard parameters as follows:
Check box is checked — The switch allows some red frames to be transmitted. This
maximizes network usage, but may overload the network.
Check box is clear — This option avoids potential congestion. This allows strict
control of user traffic, but may waste network resources.
When the Graceful Discard check box is checked (enabled), you can configure the
red-frame percent. The red-frame percent is used to limit the number of red frames the
network is responsible for delivering. The red-frame percent (Pr) is determined as
follows:
Graceful Discard is configured on the User Preferences tab. See
for field descriptions.
Rate Enforcement Schemes
Rate enforcement schemes provide more flexibility, increased rate enforcement
accuracy, and improved switch performance. You configure the rate enforcement
scheme in the Add PVC dialog box by completing the Rate Enf. Scheme field in the
Traffic Type tab (see
compares the accuracy and switch performance of the Jump and Simple
rate enforcement schemes. Number 1 specifies the more accurate scheme and better
switch performance, while 2 specifies a less-accurate scheme and slightly degraded
switch performance.
Table 10-10.
Rate Enforcement Schemes
Scheme
Rate Enforcement Accuracy
Switch Performance
Jump
1
2
Simple
2
1
Allowed red frame bits
Bc + Be + allowed red frame bits
Pr =
Содержание CBX 3500
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