Troubleshooting guide

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ATM and Layer 3 Switch Router Troubleshooting Guide
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Chapter 6 Troubleshooting Switch Router ATM Network Connections
Using PNNI Trace Connection
If you determine that the clock configuration is causing cells to be dropped, see the “Initially
Configuring the ATM Switch” chapter in the ATM Switch Router Software Configuration Guide.
For more information on troubleshooting network clocking, see the “Troubleshooting Network
Clocking” section on page 9-7.
Using PNNI Trace Connection
PNNI trace connection is used to trace existing switched connections through a PNNI network. To use
trace connection, the switched connection should first be established with normal signaling procedures;
once the connection is established, you can use trace connection to follow this connection as it traverses
the PNNI network.
You can trace the following virtual-circuit connections:
• SVC
• SVPC
• Soft VC
• Soft VPC
You can initiate a connection-trace in the following ways:
• From any ATM interface—such as UNI, NNI, IISP, or AINI—using any of the following values:
– VPI and VCI
– Call-reference (and Endpoint-reference)
• For Soft-VCs, you only need to specify the VPI-VCI of the permanent leg on the ATM interface.
• From a Frame-Relay interface, you specify the DLCI, and the trace information for the
corresponding soft-VC is provided automatically.
Note Connection-trace only provides information on the portion of the connection that is within the PNNI
network.
Using connection-trace provides the following connection information:
• Node-ID of each node traversed
• Port-ID—only one port-ID for each node traversed, and both port-IDs for end-points
• VPI-VCI value on each link (optional)
• Call-reference value on each link (optional)
• For Point-to-Multi-Point connections, the end-point reference value on each link (optional)