Troubleshooting guide

8-41
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting MPLS ATM Connections
Step 5 Check the Neighbor(s) field. It should display the IP address of the next node in the VPN.
Step 6 Check the Routing Information Sources field. It should display the interface IP addresses used to update
the MPLS label binding information.
Step 7 Enter the show ip cef vrf command with the VRF name to display the entries in the FIB table based on
the IP address, and to verify that the CEF table has the correct precedence value for the prefix.
8540-ATM-PE1# show ip cef vrf 1
Prefix Next Hop Interface
0.0.0.0/32 receive
11.0.0.0/8 attached GigabitEthernet2/0/1
11.0.0.0/32 receive
11.0.0.1/32 11.0.0.1 GigabitEthernet2/0/1
11.0.0.2/32 receive
11.255.255.255/32 receive
14.0.0.0/8 100.0.0.2 POS10/0/0
101.0.0.0/8 11.0.0.1 GigabitEthernet2/0/1
105.0.0.0/8 100.0.0.2 POS10/0/0
172.20.0.0/16 11.0.0.1 GigabitEthernet2/0/1
224.0.0.0/24 receive
255.255.255.255/32 receive
8540-ATM-PE1#
Step 8 Enter the show ip cef vrf command with the VRF name and the detail keyword to display the entries in
the FIB table in greater detail.
8540-ATM-PE1# show ip cef vrf 1 detail
IP CEF with switching (Table Version 67), flags=0x0
12 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 2
35 leaves, 39 nodes, 42464 bytes, 208 inserts, 173 invalidations
0 load sharing elements, 0 bytes, 0 references
universal per-destination load sharing algorithm, id 57B35947
2 CEF resets, 0 revisions of existing leaves
Resolution Timer: Exponential (currently 1s, peak 1s)
0 in-place/0 aborted modifications
refcounts: 3400 leaf, 3386 node
Adjacency Table has 13 adjacencies
0.0.0.0/32, version 0, receive
11.0.0.0/8, version 6, attached, connected
0 packets, 0 bytes
tag information set
local tag: 19
via GigabitEthernet2/0/1, 0 dependencies
valid glean adjacency
tag rewrite with , , tags imposed: {}
11.0.0.0/32, version 4, receive
11.0.0.1/32, version 7, connected, cached adjacency 11.0.0.1
0 packets, 0 bytes
via 11.0.0.1, GigabitEthernet2/0/1, 2 dependencies
next hop 11.0.0.1, GigabitEthernet2/0/1
valid cached adjacency
11.0.0.2/32, version 3, receive
11.255.255.255/32, version 5, receive
14.0.0.0/8, version 65, cached adjacency to POS10/0/0
0 packets, 0 bytes
tag information set
local tag: VPN-route-head
fast tag rewrite with
Recursive rewrite via 104.0.0.4/32, tags imposed {18}