Chapter Summary
Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco routing protocol that is designed
to address the shortcomings of both distance vector and link-state routing protocols. This chapter
expanded on the underlying technologies within EIGRP, including the path selection process,
changes in topology, load balancing, authentication, and troubleshooting common problems.
Example 5-20 Con?¬?rming MD5 Authentication
RouterX# ddeebbuugg eeiiggrrpp ppaacckkeettss
*Jan 21 16:54:09.821: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.1.102 (Serial0/
0/1) is down: retry limit exceeded
*Jan 21 16:54:11.745: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.1.102 (Serial0/
0/1) is up: new adjacency
RouterX# sshhooww iipp eeiiggrrpp nneeiigghhbboorrss
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.102 Se0/0/1 13 00:00:38 1 5000 1 0
Review Questions 201
The following summarizes the key points that were discussed in this chapter:
?– EIGRP is a classless routing protocol that supports VLSM.
?– Path selection is based on several factors.
?– EIGRP keeps a next-best alternative path, called a feasible successor, for fast convergence.
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