Cisco IP Routing Protocols: Trouble Shooting Techniques (Charles River Media Networking/Security)

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.