Displaying System Information
4-26
9621-A2-GB20-30
August 1997
PVC Performance Statistics
Permanent Virtual Circuit performance statistics only appear when PVCs ( V ) is
selected from the screen function keys area at the bottom of the Network, Port-1,
Port-2, and BRI-B1 Frame Relay screens.
Follow this menu sequence:
Main Menu
→
Status
→
Performance Statistics
→
[
Network/Port- 1/Port- 2/BRI-B1]
→
P V Cs
Statistic
What It Indicates
Interface’s PVC
DLCI
DLCI number selected for display of the PVC statistics for a
specific DLCI.
This is a DLCI selection or entry field.
Tx/ Rx Characters
Number of data octets ( 8-bit bytes) sent/received for the
selected DLCI on the interface.
Tx / Rx Frames
Number of frames sent/received for the DLCI on the interface.
Tx / Rx Frames
Within CIR
Number of frames sent/received for the DLCI on the interface
that are within the committed information rate that had been
configured.
Tx / Rx Frames
Exceed CIR
Number of frames sent/received for the DLCI on the interface
that exceed the committed information rate that had been
configured.
Tx / Rx Frames
Dropped
Number of frames dropped for the DLCI on the interface due to
CIR enforcement or congestion control.
Tx / Rx Frames
With DE
Number of frames sent/received for the DLCI on the interface
that have the discard eligible bit set.
Tx BECN Frames
Number of Backward-Explicit Congestion Notifications sent
over the interface.
The network sends BECNs to notify users of data traffic
congestion in the opposite direction of the frame carrying the
BECN indicator.
The access unit may have set this bit. This could occur if this
DLCI is a source DLCI on a PVC connection, and CIR is
greater than the CIR set for the destination DLCI, causing data
to be discarded.
This could also occur when the speed of the alternate
destination (backup) link is lower than the source DLCI’s.