Troubleshooting guide

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ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting Tag Switching on VP Tunnels
Step 3 Enter the show tag-switching tsp-tunnels command to confirm VP tunnel configuration at the tail-end
switch router or router:
AdminFl1Rt1# show tag-switching tsp-tunnels
Signalling Summary:
TSP Tunnels Process: running
RSVP Process: running
Forwarding: enabled
TUNNEL ID DESTINATION STATUS CONNECTION
10.106.0.6 0 10.2.0.12 up up
AdminFl1Rt1#
Step 4 Check whether the TSP Tunnels Process is running. If it is not, enter the tag-switching tsp-tunnels
command to enable the process globally on the switch router or router.
Step 5 Check whether the RSVP Process is running. If it is not, enter the tag-switching tsp-tunnels command
on the interfaces used by the tunnel to enable the process on the interface.
Step 6 If this is a router connection, check whether Forwarding is enabled on the router. If it is not, enter the ip
cef distributed switch command or ip cef switch command to enable IP Cisco Express Forwarding
(CEF) globally on the router.
Step 7 Enter the show tag-switching interfaces command to check the VP tunnel interface configuration at
each switch router or router in the tunnel. The following example starts at the head end:
EngFl1Rt1# show tag-switching interfaces
Interface IP Tunnel Operational
ATM4/0/0 Yes No Yes
ATM1/1/0 Yes No Yes
EngFl1Rt1#
Step 8 Enter the show tag-switching interfaces command to check the VP tunnel interface configuration at the
middle switch router or routers:
AdminFl1Ls1# show tag-switching interfaces
Interface IP Tunnel Operational
ATM3/0/0 Yes Yes Yes
ATM1/0/0 Yes Yes Yes
AdminFl1Ls1#
Step 9 Enter the show tag-switching interfaces command to confirm VP tunnel configuration at the tail end
switch router or router:
AdminFl1Rt1# show tag-switching interfaces
Interface IP Tunnel Operational
ATM0/0 Yes Yes Yes
Ethernet 2/3 Yes Yes Yes
AdminFl1Rt1#
Step 10 Check whether the interfaces used by the tunnel have “Yes” in the Tunnel column. If they do not, use the
tag-switching tsp-tunnels command on the interfaces used by the tunnel to enable TSP tunnels, and
refer to the “Configuring Tag Switching” chapter in the ATM Switch Router Software
Configuration Guide. Verify that the interfaces used by the tunnel are operational. The interfaces should
have “Yes” in the Operational column.
If they do not, check the interface configuration and refer to the “Configuring Tag Switching” chapter in
the ATM Switch Router Software Configuration Guide.