PURPOSE OF NHRP
The purpose of NHRP is to discover and correlate a layer 3 (network layer address) and the NBMA subnetwork address of the NBMA next hop to a destination station. The term NBMA subnetwork address refers to the underlying layer beneath the internetworking layer. Examples of NBMA subnetwork addresses are X.25 addresses, ATM addresses, and SMDS addresses.[1]
[1] Strictly speaking, this definition of an NBMA subnetwork address is not correct, although it is used throughout the NHRP specifications. X.25 is a internetwork layer operation but the idea behind the NHRP is to define the conventional internetworking layer (layer 3) to operate over the NBMA subnetwork. So, for X.25 we could have two layer 3 protocols involved in the process ...
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