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Preventing Unwanted Neighbors Using Passive

When an EIGRP network configuration subcommand matches an interface, EIGRP on
that router does two things:
Step 1. Attempts to find potential EIGRP neighbors by sending Hellos to the multicast address
Step 2. Advertises about the subnet connected to that interface
In some cases, however, no legitimate EIGRP neighbors may exist off an interface. For example,
consider the small internetwork of Figure 1-1, with three routers, and with only
one router connected to each LAN interface. Each router needs to advertise about the
subnets connected to their various FastEthernet interfaces, but at the same time, there is
no benefit to multicast EIGRP Hellos on those interfaces because only one router connects
to each LAN.
The network designer may reasonably choose to limit EIGRP on those interfaces that have
no legitimate EIGRP neighbors. However, the subnets connected to those same interfaces
also typically need to be advertised by EIGRP. For example, subnet, off R1

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