Reviewing and Configuring the ARP Table ip proxy-arp
16-16 IP Configuration
Mode
Routercommand,Interfaceconfiguration:Matrix>Router(config‐if(Vlan1))#
Usage
Thiscommandwillbeineffectiftheipgratuitous‐arpignorecommand(“ipgratuitous‐arp”on
page 16‐15)isused.TherewillbenolearningfromgratuitousARPframes,evenwiththeip
gratuitous‐arp‐learningcommandenabled.
The“no”formofthiscommanddisablesgratuitousARPlearning.
Example
ThisexampleshowshowtoenablegratuitousARPlearningforbothrequestsandreplieson
VLAN1:
Matrix>Router(config)#interface vlan 1
Matrix>Router(config-if(Vlan 1))#ip gratuitous-arp-learning both
ip proxy-arp
UsethiscommandtoenableproxyARPonaninterface.ThisvariationoftheARPprotocolallows
theroutingmoduletosendanARPresponseonbehalfofanendnodetotherequestinghost.
Syntax
ip proxy-arp [default-route] [local]
no ip proxy-arp
Parameters
Defaults
None.
Mode
Routercommand,Interfaceconfiguration:Matrix>Router(config‐if(Vlan1))#
Usage
ProxyARPcanlessenbandwidthuseonslow‐speedWANlinks.Itisenabledbydefault.
The“no”formofthiscommanddisablesproxyARP
default‐route (Optional)SetstheroutertorespondtoARPrequestsforhoststhatare
onlyreachableviathedefaultroute.Typically,proxyarpisonlyused
to
replytorequestsforhostthatarereachableviaanon‐defaultroute.
local (Optional)AllowstheroutertorespondtoARPrequeststhatare
receivedontheinterfacetowhichthiscommandisappliedifthesource
IPaddressoftherequestisreachableonthisinterface.
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