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The '''Next Hop Resolution Protocol''' (NHRP) is an extension of the ATM ARP routing mechanism<ref>{{cite journal|last1=White|first1=P.P.|title=ATM switching and IP routing integration: the next stage in Internet evolution?|journal=IEEE Communications Magazine|date=April 1998|volume=36|issue=4|pages=79–83|doi=10.1109/35.667418|url=http://www.cl.cam.ac.uk/~jac22/otalks/atmipint.pdf|accessdate=18 June 2016}}</ref> that is sometimes used to improve the efficiency of routing computer network traffic over [[Nonbroadcast Multiple Access Network|Non-Broadcast, Multiple Access (NBMA) Networks]].<ref>{{cite web|title=NHRP|url=http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html#wp1054887|website=Cisco|accessdate=17 June 2016}}</ref> It is defined in [[IETF]] RFC 2332,<ref>{{cite web|last1=B.|first1=Cole,|last2=J.|first2=Luciani,|last3=N.|first3=Doraswamy,|last4=D.|first4=Piscitello,|last5=D.|first5=Katz,|title=NBMA Next Hop Resolution Protocol (NHRP)|url=https://tools.ietf.org/html/rfc2332|website=tools.ietf.org|accessdate=17 June 2016}}</ref> and further described in RFC 2333.<ref>{{cite web|last1=Cansever|first1=Derya H.|title=NHRP Protocol Applicability Statement|url=https://tools.ietf.org/html/rfc2333|website=tools.ietf.org|accessdate=17 June 2016}}</ref> It can be used by a sender to determine a route with the fewest number of hops to a receiver.<ref>{{cite web|last1=Rouse|first1=Margaret|title=What is Next Hop Resolution Protocol (NHRP)? - Definition from WhatIs.com|url=http://searchnetworking.techtarget.com/definition/Next-Hop-Resolution-Protocol|website=SearchNetworking|accessdate=17 June 2016}}</ref> The protocol differs from [[Address Resolution Protocol|ARP]]-type protocols in that it allows routing optimization across multiple IP subnets.<ref>{{cite journal|last1=Luciani|first1=James V.|title=Next-hop resolution protocol|date=1 January 1997|journal=SPIE Proceedings|volume=3233|pages=161–165|doi=10.1117/12.290456|url=http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=933004}}</ref> The NHRP forms a part of the [[Multiprotocol Encapsulation over ATM]] (MPOA) protocol as described in RFC 2684.<ref>{{cite journal|last1=Newman|first1=P.|last2=Lyon|first2=T.|last3=Minshall|first3=G.|title=Flow labelled IP: a connectionless approach to ATM|journal=Proceedings IEEE INFOCOM '96. Fifteenth Annual Joint Conference of the IEEE Computer Societies. Networking the Next Generation|date=1 March 1996|volume=3|pages=1251–1260 vol.3|doi=10.1109/INFCOM.1996.493071|url=https://www.researchgate.net/profile/Greg_Minshall/publication/2615390_Flow_labelled_IP_a_connectionless_approach_to_ATM/links/542da61e0cf29bbc126d7998.pdf|accessdate=18 June 2016}}</ref>
==Description==
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