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NHRP Protocol Applicability Statement (RFC2333)

IP.com Disclosure Number: IPCOM000002901D
Original Publication Date: 1998-Apr-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 7 page(s) / 19K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Cansever: AUTHOR

Abstract

As required by the Routing Protocol Criteria [RFC 1264], this memo discusses the applicability of the Next Hop Resolution Protocol (NHRP) in routing of IP datagrams over Non-Broadcast Multiple Access (NBMA) networks, such as ATM, SMDS and X.25.

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Network Working Group D. Cansever

Request for Comments: 2333 GTE Laboratories, Inc.

Category: Standards Track April 1998

NHRP Protocol Applicability Statement

Status of this Memo

This document specifies an Internet standards track protocol for the

Internet community, and requests discussion and suggestions for

improvements. Please refer to the current edition of the "Internet

Official Protocol Standards" (STD 1) for the standardization state

and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

Abstract

As required by the Routing Protocol Criteria [RFC 1264], this memo

discusses the applicability of the Next Hop Resolution Protocol

(NHRP) in routing of IP datagrams over Non-Broadcast Multiple Access

(NBMA) networks, such as ATM, SMDS and X.25.

1. Protocol Documents

The NHRP protocol description is defined in [1]. The NHRP MIB

description is defined in [2].

2. Introduction

This document summarizes the key features of NHRP and discusses the

environments for which the protocol is well suited. For the purposes

of description, NHRP can be considered a generalization of Classical

IP and ARP over ATM which is defined in [3] and of the Transmission

of IP Datagrams over the SMDS Service, defined in [4]. This

generalization occurs in 2 distinct directions.

Firstly, NHRP avoids the need to go through extra hops of routers

when the Source and Destination belong to different Logical Internet

Subnets (LIS). Of course, [3] and [4] specify that when the source

and destination belong to different LISs, the source station must

forward data packets to a router that is a member of multiple LISs,

even though the source and destination stations may be on the same

logical NBMA network. If the source and destination stations belong

to the same logical NBMA network, NHRP provides the source station

with an inter-LIS address resolution mechanism at the end of which

both stations can exchange packets without having to use the services

of intermediate routers. This feature is also referred to as

"short-cut" routing. If the destination station is not part of the

logical NBMA network, NHRP provides the source with the NBMA address

of the current egress router towards the destination.

The second generalization is that NHRP is not specific to a

particular NBMA technology. Of course, [3] assumes an ATM network

and [4] assumes an SMDS network at their respective subn...