If no feasible successor exists,
a recomputation must occur to determine the new successor.
Con?¬?guring and Verifying EIGRP
Use the router eigrp and network commands to create an EIGRP routing process. Note that
EIGRP requires an autonomous system (AS) number. The AS number does not have to be
registered as is the case when routing on the Internet with the Border Gateway Protocol (BGP)
routing protocol. However, all routers within an AS must use the same AS number to exchange
routing information with each other. Figure 5-3 shows the EIGRP con?¬?guration of a simple
network.
Figure 5-3 EIGRP Con?¬?guration
The network command de?¬?nes a major network number to which the router is directly connected.
The EIGRP routing process looks for interfaces that have an IP address that belongs to the
A C B
172.16.1.1
172.16.1.0 192.168.1.0
10.1.1.1 10.1.1.2 10.2.2.2 10.2.2.3 192.168.1.1
S2 S2 S3 S3 E0 E0
Autonomous System = 100
router eigrp 100
network 10.0.0.0
router eigrp 100
network 192.168.1.0
network 10.0.0.0
router eigrp 100
network 172.16.0.0
network 10.0.0.0
Implementing EIGRP 175
networks that are speci?¬?ed with the network command and begins the EIGRP process on these
interfaces.
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