Beta Draft Confidential
Configuring ATM PVCs
About the PVC Tabs
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/0510-27
Table 10-5. Add PVC: User Preference Tab Fields
Field Action/Description
Graceful Discard
(Forward/Reverse)
(ATM UNI endpoint
on Frame-based
card)
Select or clear the check box to define how this circuit handles
“red” packets. Red packets are designated as those bits received
during the current time interval that exceed the committed burst
size (Bc) and excess burst size (Be) thresholds, including the
current frame. The discard eligible (DE) bit for a red packet is set
to 1, meaning the network can discard this packet unless the
Graceful Discard check box is selected.
Check box checked – (default) Forwards some red packets if there
is no congestion.
Check box unchecked – Immediately discards red packets.
Note: For the ATM UNI DS3/E3, if you set this value for shaping
purposes, the switch code ignores the PCR, SCR, and MBS values
calculated from the Add PVC: Traffic Type tab (Figure 10-12 on
page 10-54); the switch instead picks the highest PCR queue
available and sets the SCR to that PCR.
Red Frame Percent
(Forward/Reverse)
(ATM UNI endpoint
on Frame-based
card)
Set this value only if the Graceful Discard check box is checked.
The default is 100. See “Graceful Discard” on page 10-46 for more
information. The Red Frame Percent field limits the number of red
frames the network is responsible to deliver.
PVC Loopback
Status
(Forward/Reverse)
(ATM UNI endpoint
on Frame-based
card)
Displays the current loopback state. If None is not displayed in the
PVC Loopback Status field, do not attempt to modify or delete the
selected circuit.
See the Switch Diagnostics User’s Guide for CBX 3500, CBX 500,
GX 550, and B-STDX 9000 for more information about loopback
testing.
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