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 MPLS ATM Connections
Step 6 Enter the show mpls ldp discovery command to verify the interface is sending TDP Hello messages.
8540-ATM-PE1# show mpls ldp discovery
Local LDP Identifier:
102.0.0.2:0
Discovery Sources:
8540-ATM-PE1#
The Local LDP Identifier should display the Loopback 0 IP address.
Step 7 Enter the show ip vrf command to verify the VRFs are present on the ATM switch routers and on their
associated route-indicators and interface(s).
8540-ATM-PE1# show ip vrf
Name Default RD Interfaces
1 1:1 GigabitEthernet2/0/1
8540-ATM-PE1#
Step 8 Verify the existence of the VRFs, and their names are valid.
Step 9 Verify that each Default RD (route-descriptor) field is the same at each provider edge ATM switch router.
If not, check the configuration of the interfaces.
Step 10 Enter the show ip vrf detail command to examine the VRFs more closely.
8540-ATM-PE1# show ip vrf detail
VRF 1; default RD 1:1
Interfaces:
GigabitEthernet2/0/1
Connected addresses are not in global routing table
Export VPN route-target communities
RT:1:1
Import VPN route-target communities
RT:1:1
No import route-map
No export route-map
8540-ATM-PE1#
Note Remember that VPN routing/forwarding instance (VRF) names are case sensitive. For example, a
VRF named “Red” is not the same as one named “red”.
Verifying Routing Information
This section describes the process you can use to verify the routing configuration associated with an
MPLS VPN.
To troubleshoot the MPLS VPN routing configuration, use the following commands:
Command Purpose
show ip route vrf vrf_name Shows the IP routing table associated
with a VRF.
show ip route vrf vrf_name protocol Shows the IP routing table associated
with a VRF and a specific protocol.