Troubleshooting guide

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ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 6 Troubleshooting Switch Router ATM Network Connections
Troubleshooting SVC Connections on a PNNI Routing Network
Checking SVC Downstream
This section is separated into two subsections:
• Flat Network
• Hierarchical Network
Proceed to the sub-section that best describes your PNNI network configuration.
Flat Network
Use the following commands to check ATM signaling events on the terminating switch router:
Note This process also applies to troubleshooting an SVC connection downstream in a terminating end
peer group in a PNNI hierarchy.
Follow these steps to enable ATM signaling events debugging for the terminating end switch router UNI
interface (on EngFl1Ls1 ATM 0/0/0):
Step 1 Use the debug atm sig-events atm card/subcard/port command to display signaling events at the
terminating end of the switch router on the UNI interface.
Step 2 Alternately, you can set up a signaling diagnostic filter by using the appropriate called and calling end
NSAP address, and examine the diagnostic record you receive.
Step 3 Retry to set up the SVC from EndSys1.
Step 4 If no debug printouts occur on the terminating switch router (EngFl1Ls1 in this example), then the
signaling messages are not reaching the terminating node. Check for valid signaling status on the NNI
links interconnecting the switch router nodes, using the show atm status command and show atm
interface command.
Note Confirm that the terminal monitor has been enabled on the switch router by entering the
terminal monitor EXEC command.
If debug printouts are shown on the terminating switch router (EngFl1Ls1 in this example), the problem
has been isolated to either the terminating switch router, UNI, or the end system.
Step 5 Turn off further debug printouts with the no debug all command and scroll up to the beginning of the
printouts to check the validity of party addresses and the occurrence of repeat events.
Step 6 Check for a valid Called Party Address and Calling Party Address (or a valid target address in the
ROUTING INTERFACE information). If these are not valid, the printout might be for some other SVC
set-up.
Command Purpose
debug atm sig-events atm card/subcard/port Confirms the SVC connection from the
destination end of the SVC.
no debug all Turns off debugging.