Troubleshooting guide

8-22
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting MPLS Connections
Step 6 Enter the show ip cef summary command to display specific entries in the Forwarding Information Base
(FIB), based on IP address information.
8540-P# show ip cef summary
IP CEF with switching (Table Version 33), flags=0x0
25 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 1
49 leaves, 54 nodes, 60080 bytes, 57 inserts, 8 invalidations
0 load sharing elements, 0 bytes, 0 references
universal per-destination load sharing algorithm, id D95A5EB6
2 CEF resets, 0 revisions of existing leaves
Resolution Timer: Exponential (currently 1s, peak 1s)
0 in-place/0 aborted modifications
refcounts: 1406 leaf, 1389 node
Adjacency Table has 9 adjacencies
2 incomplete adjacencies
Verify the show ip cef command output does not display “%CEF not running” as shown in the following
example.
Switch# show ip cef
%CEF not running
Prefix Next Hop Interface
Switch#
If the CEF is not running, re-enable Cisco Express Forwarding using the ip cef global configuration
command.
Enter the show ip cef command to display Prefix and Next Hop information.
8540-P# show ip cef
Prefix Next Hop Interface
0.0.0.0/32 receive
4.4.4.0/24 attached ATM9/0/0
4.4.4.0/32 receive
4.4.4.1/32 receive
4.4.4.255/32 receive
6.6.6.0/24 attached ATM9/0/1
6.6.6.0/32 receive
6.6.6.1/32 receive
6.6.6.255/32 receive
11.0.0.0/8 4.4.4.2 ATM9/0/0
100.1.0.0/16 4.4.4.2 ATM9/0/0
111.0.1.0/30 attached FastEthernet11/0/0
111.0.1.0/32 receive
111.0.1.1/32 111.0.1.1 FastEthernet11/0/0
111.0.1.2/32 receive
111.0.1.3/32 receive
111.0.1.16/30 attached FastEthernet11/0/1
111.0.1.16/32 receive
111.0.1.17/32 receive
111.0.1.18/32 111.0.1.18 FastEthernet11/0/1
111.0.1.19/32 receive
171.69.1.0/24 attached Ethernet0
Prefix Next Hop Interface
172.20.42.0/24 attached Ethernet0
172.20.42.0/32 receive
172.20.42.123/32 receive
172.20.42.206/32 172.20.42.206 Ethernet0
172.20.42.255/32 receive
200.1.0.0/16 6.6.6.2 ATM9/0/1
222.2.1.1/32 111.0.1.1 FastEthernet11/0/0
222.2.1.2/32 111.0.1.18 FastEthernet11/0/1
222.2.1.3/32 receive