Neighbor Relationships
This final major section of the chapter examines the large number of facts that each router must check with each potential neighbor before the two routers become neighbors.
At a very basic level, routing protocols can easily create neighbor relationships using a Hello protocol. First, the routing protocol must be enabled on an interface. In addition, the interface may not be configured as a passive interface, because that stops the routing protocol from sending the Hello messages.
Beyond this basic process, the routing protocols actually check several other parameters to find out whether the routers should become neighbors. Both OSPF and EIGRP use Hello messages, and these messages each list information used to perform ...
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