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 the PNNI Lowest-level Interface
Note For UNI interfaces, the PNNI Hello protocol is not used. The Hello state is not applicable for
UNI interfaces.
If the hello state reads “LoopErr,” it means that the line side is connected to another port on the same
switch router, or to another switch router that has an identical node ID.
Step 2 Check the output of the show atm interface atm card/subcard/port command to confirm that the
interface is configured with the following:
• Auto-config is enabled (or as NNI)
• IF-type is NNI
• signaling is enabled
If the interface is port-type: vp tunnel, confirm that the VP tunnel is configured correctly at both ends.
see the “Troubleshooting Virtual Path Tunnel Connections” section on page 6-55.
Also check whether the listed port-adapter port-type supports ATM VCs on its line side. If it does not,
then this interface will not be usable either as an NNI or as a UNI signaling interface.
Checking the PNNI and Signaling Control Channels
Use the following command to check the status of the PNNI Routing Control Channel (RCC) and
signaling control channels:
Follow these steps to check that the PNNI RCC and signaling control channel VCs are up:
Step 1 Use the show atm vc interface atm card/subcard/port command to confirm the status of the signaling
control channels:
Switch# show atm vc interface ATM 0/0/1
Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status
ATM0/0/1 0 5 PVC ATM2/0/0 0 43 QSAAL UP
ATM0/0/1 0 16 PVC ATM2/0/0 0 35 ILMI UP
ATM0/0/1 0 18 PVC ATM2/0/0 0 107 PNNI UP
Switch#
Step 2 Check the command display for the following:
• Whether VCs with Encap (Encapsulation) types of PNNI and Q.2931 Signaling ATM Adaptation
Layer (QSAAL) are not shown, check the interface configuration to confirm that signaling is
enabled.
• If the interface has the manual-well-known-vc mode enabled, either disable it, or if that is the
preferred mode, then manually configure PVCs with encapsulation types PNNI and QSAAL.
Command Purpose
show atm interface atm card/subcard/port Confirms the PNNI signaling control
channels status.