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NBMA Next Hop Resolution Protocol (NHRP) (RFC2332)

IP.com Disclosure Number: IPCOM000002900D
Original Publication Date: 1998-Apr-01
Included in the Prior Art Database: 2000-Sep-13

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Luciani: AUTHOR [+5]

Abstract

This document describes the NBMA Next Hop Resolution Protocol (NHRP). NHRP can be used by a source station (host or router) connected to a Non-Broadcast, Multi-Access (NBMA) subnetwork to determine the internetworking layer address and NBMA subnetwork addresses of the "NBMA next hop" towards a destination station. If the destination is connected to the NBMA subnetwork, then the NBMA next hop is the destination station itself. Otherwise, the NBMA next hop is the egress router from the NBMA subnetwork that is "nearest" to the destination station. NHRP is intended for use in a multiprotocol internetworking layer environment over NBMA subnetworks.

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Network Working Group J. Luciani

Request for Comments: 2332 Bay Networks

Category: Standards Track D. Katz

cisco Systems

D. Piscitello

Core Competence, Inc.

B. Cole

Juniper Networks

N. Doraswamy

Bay Networks

April 1998

NBMA Next Hop Resolution Protocol (NHRP)

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

This document describes the NBMA Next Hop Resolution Protocol (NHRP).

NHRP can be used by a source station (host or router) connected to a

Non-Broadcast, Multi-Access (NBMA) subnetwork to determine the

internetworking layer address and NBMA subnetwork addresses of the

"NBMA next hop" towards a destination station. If the destination is

connected to the NBMA subnetwork, then the NBMA next hop is the

destination station itself. Otherwise, the NBMA next hop is the

egress router from the NBMA subnetwork that is "nearest" to the

destination station. NHRP is intended for use in a multiprotocol

internetworking layer environment over NBMA subnetworks.

Note that while this protocol was developed for use with NBMA

subnetworks, it is possible, if not likely, that it will be applied

to BMA subnetworks as well. However, this usage of NHRP is for

further study.

This document is intended to be a functional superset of the NBMA

Address Resolution Protocol (NARP) documented in [1].

Operation of NHRP as a means of establishing a transit path across an

NBMA subnetwork between two routers will be addressed in a separate

document (see [13]).

1. Introduction

The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,

SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this

document, are to be interpreted as described in [15].

The NBMA Next Hop Resolution Protocol (NHRP) allows a source station

(a host or router), wishing to communicate over a Non-Broadcast,

Multi-Access (NBMA) subnetwork, to determine the internetworking

layer addresses and NBMA addresses of suitable "NBMA next hops"

toward a destination station. ...