Points to Remember

• TCP/IP troubleshooting commands like ping, traceroute, and show ip route are used to isolate problems in EIGRP environments.

• EIGRP packets are monitored using the debug eigrp packets command.

• The show ip eigrp interfaces command shows a list of interfaces in which EIGRP is enabled.

• The show ip eigrp neighbors command shows EIGRP enabled routers that are on directly connected networks of a router.

• The show ip eigrp topology command shows topology of an entire EIGRP domain.

• The show ip eigrp traffic command shows statistics of the EIGRP generated traffic.

• The debug eigrp neighbors command monitors status of EIGRP neighbors.

• The debug eigrp packets command monitors EIGRP packets.

• The debug eigrp transmit command tracks all EIGRP transmission events, such as ack, packetize, startup, peerdown, link, build, strange, sia, and detail.

• The debug eigrp fsm command displays EIGRP DUAL algorithm functioning and stages of building topology table.

• Misconfiguration occurs because networks are not declared or because the same AS is not defined in all routers in the EIGRP domain.

• EIGRP neighbor problems occur when a new node is added or when initially existing neighbor relations are no longer present in the network.

• Routers that fail to reply to queries are said to be in Stuck-In-Active (SIA) state.