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
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 6 Veri fy:
• That the routing table is correct (from a customer point of view), or what is missing from the routing
table.
• That protocol is up and working (or you can see 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.
To verify the MPLS VPN label configuration, use the following commands:
Follow these steps to verify the labels on MPLS VPN interface connections:
Step 1 Enter the show mpls ip bindings command to display the contents of the label information base (LIB).
8540-ATM-PE1# show mpls ip binding
3.0.0.0/8
in label: 17
100.0.0.2/32
in label: 16
102.0.0.2/32
in label: imp-null
104.0.0.4/32
in label: 18
171.69.0.0/16
in label: imp-null
172.20.0.0/16
in label: imp-null
172.20.72.0/26
in label: imp-null
8540-ATM-PE1#
Command Purpose
show mpls ip bindings Shows the contents of the label
information base (LIB).
show ip bgp vpnv4 all tags Shows the VPN address information from
the BGP table.
show ip protocols vrf Shows the routing protocol information
associated with a VRF.
show ip cef vrf Shows the CEF forwarding table
associated with a VRF.