Troubleshooting guide

8-3
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Initial Troubleshooting of Tag Switching
Figure 8-1 Tag Switching Example Network
This network example is used to describe the troubleshooting examples in the rest of this chapter.
For detailed configuration information about tag switching, refer to the “Configuring Tag Switching”
chapter in the ATM Switch Router Software Configuration Guide.
Initial Troubleshooting of Tag Switching
This section describes initial troubleshooting steps that you should perform when beginning to
troubleshoot a tag switching connection.
At the switch router, use the following commands to check the tag switching configuration:
140.0.0.0
150.0.0.0
160.0.0.0
170.0.0.0
180.0.0.0
e2/3 a0/0
e0/3 a1/0
a1/1/0
a3/0/0
a1/0/0
a4/0/0
.1
.1
.1
.2
.2
.2.1 .1
12299
Tag edge router
Tag switch router
(ATM switch router)
Tag edge router
AdminFl1Ls1
Loopback 2.2.2.2
EngFl1Ls1
Loopback 3.3.3.3
AdminFl1Rt1
Loopback 1.1.1.1
EngFl1Rt1
Loopback 4.4.4.4
Command Purpose
show tag-switching tdp discovery Confirms the TDP identifier for the tag
switching switch router or router that
might be malfunctioning.
ping tdp_id_of_neighbor Confirms that each tag switching switch
router or router can connect to the TDP
identifier of its neighbor.
show running-config Confirms that tag switching is enabled on
the switch router.
show tag-switching interfaces Confirms the tag switching configuration
on the ATM interface.
show tag-switching interfaces detail Confirms the tag switching VPI
1
range on
an interface.
1. VPI = virtual path identifier
show interfaces loopback 0 Confirms the loopback interface 0
configuration.
show ip ospf Confirms the OSPF configuration.