The Hello Protocol

The router sends out a small hello packet to dynamically learn of other routing devices that are in the same broadcast domain.

NOTE A broadcast domain identifies devices that are within the same Layer 2 domain. Although they may not be directly connected to the same physical cable, if they are in a switched environment, from a logical Layer 2 or Layer 3 perspective, they are on the same link. If a broadcast is sent out, all the devices within the broadcast domain will hear the message and expend resources determining whether it is addressed to them. A Layer 3 device is a broadcast firewall, in that a router does not forward broadcasts.

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