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
If ROUTING INTERFACE: err_code (error codes) shows an err_code other than PNNI success, see the
“Debugging PNNI SVC Routing” section on page 6-24 for the terminating switch router node
(EngFl1Ls1 in this example).
Step 7 Confirm that there is an Input Event: Rcvd Release printout indicating a receive release and look at the
cause = reason and location. This indicates that the problem is downstream on the terminating end
system.
Hierarchical Network
Use the following commands to troubleshoot an SVC connection if the network supports PNNI hierarchy
and the terminating node is in another peer group:
Note To troubleshoot an SVC connection downstream at the terminating end peer group, see the previous
section, “Flat Network.”
Follow these steps to enable debugging ATM signaling events for the terminating end switch router on
the UNI interface (on EngFl1Ls1 ATM 0/0/0):
Step 1 Start debugging signaling events with the debug atm sig-events atm card/subcard/port command to
display signaling events on the terminating end switch router on the UNI interface.
Step 2 Retry to set up the SVC from EndSys1.
Step 3 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 a valid signaling status on the NNI
links interconnecting the nodes, using the show atm status command and show atm interface
command.
Note Confirm that the terminal monitor is 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.
Command Purpose
debug atm sig-events atm card/subcard/port Determines the exit border node for the
local peer group.
no debug all Turns off debugging.
show atm pnni identifiers Determines the internal node number and
name corresponding to the exit border
node ID.