Implementation experience with NHRP prototype software

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
Pages (from-to)166-175
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1997
Externally publishedYes
EventBroadband Networking Technologies - Dallas, TX, United States
Duration: 1997 Nov 21997 Nov 2


  • Address resolution protocol (ARP)
  • Classical IP over ATM model
  • Ip over atm
  • IP routing
  • Logical IP subnet (LIS)
  • Next hop resolution protocol(NHRP)
  • Non-broadcast multi-access(NBM) network
  • TCP

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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