The Next Hop Resolution Protocol (NHRP) is an extension of the ATM ARP routing mechanism[1] that is sometimes used to improve the efficiency of routing computer network traffic over a non-broadcast, multiple access (NBMA) network.[2] It is defined in IETF RFC 2332,[3] and further described in RFC 2333.[4] It can be used by a sender to determine a route with the fewest hops to a receiver.[5] The protocol differs from ARP-type protocols in that it allows routing optimization across multiple IP subnets.[6] NHRP is implemented by means of next-hop servers across IP subnets.[7]
NHRP forms a part of the Multiprotocol Encapsulation over ATM (MPOA) protocol as described in RFC 2684.[8][9] It also plays a role in Cisco's Dynamic Multipoint Virtual Private Network.[2] A limitation of NHRP is its inability to improve[clarify] multicast protocols.[1]
^ abWhite, P.P. (April 1998). "ATM switching and IP routing integration: the next stage in Internet evolution?" (PDF). IEEE Communications Magazine. 36 (4): 79–83. doi:10.1109/35.667418. Retrieved 18 June 2016.
^ ab"NHRP". Cisco. Retrieved 17 June 2016.
^B., Cole; J., Luciani; N., Doraswamy; D., Piscitello; D., Katz (April 1998). "NBMA Next Hop Resolution Protocol (NHRP)". tools.ietf.org. Retrieved 17 June 2016.
^Cansever, Derya H. (April 1998). "NHRP Protocol Applicability Statement". tools.ietf.org. Retrieved 17 June 2016.
^Rouse, Margaret. "What is Next Hop Resolution Protocol (NHRP)? - Definition from WhatIs.com". SearchNetworking. Retrieved 17 June 2016.
^Luciani, James V. (1 January 1997). Civanlar, Seyhan; Widjaja, Indra (eds.). "Next-hop resolution protocol". SPIE Proceedings. Broadband Networking Technologies. 3233: 161–165. Bibcode:1997SPIE.3233..161L. doi:10.1117/12.290456. S2CID 21461973.
^Ahmad, Khalid (2 April 2004). Sourcebook of ATM and IP Internetworking. John Wiley & Sons. p. 360. ISBN 9780471660941. Retrieved 18 June 2016.
^Newman, P.; Lyon, T.; Minshall, G. (1 March 1996). "Flow labelled IP: A connectionless approach to ATM". Proceedings of IEEE INFOCOM '96. Conference on Computer Communications. Vol. 3. pp. 1251–1260 vol.3. doi:10.1109/INFCOM.1996.493071. ISBN 0-8186-7293-5. S2CID 5482472. Retrieved 18 June 2016.
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