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Proceedings Paper

Implementation experience with NHRP prototype software
Author(s): Hyogon Kim
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Paper Abstract

Next hop resolution protocol (NHRP) is an IP/NBMA address resolution protocol that is being developed by IETF to replace RFC1577 ATMARP. In this paper, we discuss Bellcore's experiences and lessons from the development of the first NHRP prototype publicly released to IETF's IP over NBMA (ION) working group in late 1996. In the first half of this paper, we present the implementation details of the prototype software, the NHRP server and the NHRP client. In particular, the software configuration in our testbed, the data structures, and the control structures of the server and the client are explained. Then we illustrate the address resolution and the VC setup procedure initiated by TCP telnet application in our testbed. In the second half, we discuss the interactions between NHRP and the traditional IP routing model. We demonstrate that the NHRP server that resides on an IP router and exchanges NHRP messages with other servers through IP's routed path, such as our server implementation, cannot use the IP routing engine as such, and therefore needs a separate interface to interact with it. Also, we show that the NHRP client creates a potential scalability problem in the IP routing table size since it cannot exploit the traditional 'default' routing philosophy in which it suffices for a host to have partial routing information. Finally, we show that the NHRP client also needs to have a dynamic interaction with the IP routing protocol to create short-cuts.

Paper Details

Date Published: 6 October 1997
PDF: 10 pages
Proc. SPIE 3233, Broadband Networking Technologies, (6 October 1997); doi: 10.1117/12.290457
Show Author Affiliations
Hyogon Kim, Bell Communications Research (United States)


Published in SPIE Proceedings Vol. 3233:
Broadband Networking Technologies
Seyhan Civanlar; Indra Widjaja, Editor(s)

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