ARP

From RZWiki

ARP is an acronym for Address Resolution Protocol, in relation to a common method used by a network attached device to discover another host's hardware, layer 2 address using it's network, layer 2 address. Although predominately used in IP networks using Ethernet, ARP can be used with other layer 3 network protocols and layer 2 data link technologies.

We have a quick reference demonstrating a typical ARP exchange and detailing the ARP packet structure, available as a PDF document, here: ARP-Reference.pdf

Basic Data

RFC(s): RFC 826 - http://www.ietf.org/rfc/rfc826.txt

OSI Model Layer: Somewhere between layers two and three

Wikipedia Article: http://en.wikipedia.org/wiki/Address_Resolution_Protocol

Cisco Device Default ARP Aging Time/Timeout: 4hrs or 14400s

Extreme Summit Switch Default ARP Aging Time/Timeout: 20mins

Related Commands

For more information on how ARP can be configured on various platforms, see the arp command article.

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