Layer 3 Routing Commands 1480The interface should be configured as able to borrow an IP address, i.e. arouting interface with no IP address.Normally, the static ARP entry is only installed if the IP address matches oneof the local subnets. In case of unnumbered interfaces, static ARP entriescreated for the unnumbered-peer do not match any of the local subnets. Byspecifying the interface explicitly in the static ARP command, static ARPentries for unnumbered-peers can be installed in the ARP table.Command HistoryIntroduced in version 6.2.0.1 firmware.Exampleconsole(config-if-vlan1)#ip unnumbered gratuitous-arp acceptip unreachablesUse the ip unreachables command to enable the generation of ICMPDestination Unreachable messages. Use the no form of this command toprevent the generation of ICMP Destination Unreachable messages.Syntaxip unreachablesno ip unreachablesDefault ConfigurationICMP Destination Unreachable messages are enabled.Command ModeInterface Configuration (VLAN) modeUser GuidelinesThere are no user guidelines for this command.Exampleconsole(config-if-vlan10)#ip unreachables
