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Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter6 Tr oubleshooting Tips
VISM and PXM Display, Log, and Diagnostic Loopback Path CLI Commands
The following example shows the results of a typical dsplog command:
09/09/2001-02:09:01 03 cam VISM-6-9157
VISM got time from PXM
PXM Diagnostic Loopback Path CLI Commands
The VISM-8T1 and VISM-8E1 cards provide the capability for creating loopback paths for diagnostic
purposes. Use the VISM and PXM diagnostic loopback CLI comm a nds to tr ouble sho ot y our VISM
cards. The following loopback configurations are possible:
•Local line loopback. Use the PXM addlnloop command to enable local line loopback on a
line-by-line basis. Use the PXM dellnloop command to disable local line loopback.
•Remote line loopback. The PXM cnfbert command is a T1/E1 diagnostic t est pac kag e whi ch
includes some loopback tests.
Use the BERT and loopback functions to test the integrity of T1 and E1 lines. You can use the PXM
cnfbert command on the PXM to perform the following actions:
–
Run BERT on a per-line basis on the VISM card.
–
Put a VISM line on a TDM side loopback.
–
Put a VISM line on a network side loopback.
–
Cause the VISM to put test equipment residing on the far side into loopback.
•OAM loopback through the CPU toward the network (per VC). This loopback is enabled
automatically; no PXM or VISM CLI commands are required.
•DS0 loopback, at the compression DSP toward the TDM side. Use the PXM addendptloop
command to enable DS0 loopback on a DS0-by-DS0 basis. Use the PXM delendptloop command
to disable DS0 loopbacks.
•VC remote loopback. Use the PXM addconloop command to enable VC remote loopbacks. Use the
PXM delconloop command to disable remote loopbacks.
PXM1E and PXM 45 Display CLI Commands
Refer to the Cisco MGX 8850 Installation and Configuration Guide and the Cisco MGX 8000 Series
Switch Command Reference for information on the following PXM1, PXM1E, and PXM45 card display
commands.