Troubleshooting the Packet-Forwarding Process
When troubleshooting packet-forwarding issues, you will examine a router’s IP routing table. If the traffic’s observed behavior is not conforming to information in the IP routing table, remember that the IP routing table is maintained by a router’s control plane and is used to build the tables at the data plane. CEF is operating in the data plane and uses the FIB. Therefore, you want to view the CEF data structures (that is, the FIB and the adjacency table) that contain all the information required to make packet-forwarding decisions.
Example 12-1 provides sample output from the show ip route [ip_address] command. The output shows that the next-hop IP address to reach an IP address of 192.168.1.11 ...
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