Troubleshooting guide

8-28
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting MPLS VPN
Note Remember that VPN routing/forwarding instance (VRF) names are case sensitive: “Red” is not the
same as “red”.
Step 5 Enter the show ip vrf interface command to check the VRFs for a specific interface.
8540-PE2# show ip vrf interfaces
Interface IP-Address VRF Protocol
FastEthernet2/0/1.2 111.0.2.117 Green up
FastEthernet2/0/1.1 111.0.1.117 Red up
8540-PE2#
Step 6 Verify the Interface field matches the configuration of the target interface.
Step 7 Verify the VRF names and routing attributes.
Step 8 Verify the Protocol field is up.
Verifying Routing Information
Follow these steps to verify the routing tables for MPLS VPN interface connections:
Step 1 To check routing tables or routing protocol databases, use the same commands you would use to check
the global routing table. For example, enter the show ip route vrf command with the VRF-name to
display only the MPLS VPN connections.
8540-PE2# show ip route vrf Green
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
111.0.0.0/30 is subnetted, 2 subnets
B 111.0.2.100 [200/0] via 222.2.1.1, 02:07:41
C 111.0.2.116 is directly connected, FastEthernet2/0/1.2
8540-PE2#
Step 2 Check the destination for a particular address by using the show ip route vrf command with the
VRF-name and IP-address variables.
8540-PE2# show ip route vrf Green 111.0.2.116
Routing entry for 111.0.2.116/30
Known via "connected", distance 0, metric 0 (connected, via interface)
Redistributing via bgp 222
Advertised by bgp 222
Routing Descriptor Blocks:
* directly connected, via FastEthernet2/0/1.2
Route metric is 0, traffic share count is 1
8540-PE2#