Troubleshooting guide

8-31
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting MPLS VPN
Follow these steps to verify the labels on MPLS VPN interface connections:
Step 1 Enter the traceroute VRF [vrf-name] ip-address command to verify the transport addresses.
Note This command only works with an MPLS-aware traceroute, and only if the backbone ATM switch
routers are configured to propagate and generate IP Time to Live (TTL) information.
8540-PE2# traceroute vrf Red 222.2.2.1
Type escape sequence to abort.
Tracing the route to 222.2.2.1
1 111.0.1.17 4 msec 0 msec 4 msec
2 111.0.1.101 0 msec 0 msec 0 msec
3 111.0.1.102 4 msec * 0 msec
8540-PE2#
Note More precise outputs, such as the table of the labels for a particular VRF, can be seen by entering the
show ip bgp vpnv4 all tags command.
Step 2 Enter the show ip bgp vpnv4 all command to display a more precise output of the table of the labels for
a particular VRF.
8540-PE2# show ip bgp vpnv4 all
BGP table version is 17, local router ID is 222.2.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 100:1 (default for vrf Red)
*>i2.1.1.0/24 222.2.1.1 0 100 0 101 ?
*>i111.0.1.100/30 222.2.1.1 0 100 0 ?
*> 111.0.1.116/30 0.0.0.0 0 32768 ?
*>i172.20.42.0/24 222.2.1.1 0 100 0 101 ?
*>i222.2.2.1/32 222.2.1.1 0 100 0 101 i
*> 222.2.5.1/32 111.0.1.118 0 0 202 i
Route Distinguisher: 200:1 (default for vrf Green)
*>i111.0.2.100/30 222.2.1.1 0 100 0 ?
*> 111.0.2.116/30 0.0.0.0 0 32768 ?
8540-PE2#
^
% Invalid input detected at '^' marker.
8540-PE2#