Troubleshooting guide

8-30
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting MPLS VPN
For example, if your network is using the Routing Information Protocol (RIP), enter the show ip rip
database vrf command.
Switch# show ip rip database vrf vrf101
0.0.0.0/0 auto-summary
0.0.0.0/0
[2] via 150.150.0.2, 00:00:12, Ethernet1/1
6.0.0.0/8 auto-summary
6.6.6.6/32 redistributed
[1] via 223.0.0.21,
7.0.0.0/8 auto-summary
7.7.7.0/24
[1] via 150.150.0.2, 00:00:12, Ethernet1/1
10.0.0.0/8 auto-summary
10.0.0.0/8 redistributed
[1] via 125.2.2.2,
10.0.0.0/16
[1] via 150.150.0.2, 00:00:12, Ethernet1/1
10.200.8.0/22
Step 6 If you are using OSPF, you must enter the show ip ospf [process-id area-id] database command, and
specify the correct process number. For example:
Switch# show ip ospf 2 database
OSPF Router with ID (222.0.0.10) (Process ID 2)
Router Link States (Area 1)
Link ID ADV RouterAge Seq# Checksum Link count
222.0.0.1 222.0.0.1 1364 0x80000013 0x7369 3
222.0.0.10222.0.0.101363 0x80000002 0xFEFE 2
Net Link States (Area 1)
Link ID ADV RouterAge Seq# Checksum
150.150.0.1 222.0.0.101363 0x80000001 0xEC6D
Summary Net Link States (Area 1)
Link ID ADV RouterAge Seq# Checksum
6.6.6.6 222.0.0.101328 0x80000001 0x4967
69.69.0.0 222.0.0.101268 0x80000001 0x2427
222.0.0.3 222.0.0.101328 0x80000001 0xEEF7
222.0.0.30222.0.0.101268 0x80000001 0x7B5A
Step 7 Veri fy:
• That the routing table is correct (from a customer point of view), or determine what is missing from
the routing table.
• That BGP is up and working, or determine which neighbor is missing.
Verifying Labels
MPLS VPN uses a two-level label stack. One of the labels is used to identify the VRF, and is set up
between the two provider edge ATM switch routers. The other label (on the top of the stack) is the
“backbone” label, and is set up by the standard MPLS network.