Deleting Arp Entries; Proxy Arp - Allied Telesis SwitchBlade x908 Series Software Reference Manual

Internet Protocol (IP) Addressing and Protocols

Deleting ARP Entries

To remove a static ARP entry, use the command:
To clear the ARP cache of dynamic entries, use the command:
This removes the dynamic ARP entries for all interfaces.
To display the entries in the ARP cache, use the command:
The ARP cache will be repopulated by the normal ARP learning mechanism. As long as the
entries are relearned quickly enough, deleting dynamic ARP entries does not affect:
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Proxy ARP

Proxy ARP (defined in RFC 1027) allows hosts that do not support routing (i.e. they have no
knowledge of the network structure) to determine the physical addresses of hosts on other
networks. Your device intercepts ARP broadcast packets and substitutes its own physical
address for that of the remote host. This occurs only if your device has the best route to the
remote host. By responding to the ARP request, your device ensures that subsequent packets
from the local host are directed to its physical address, and it can then forward these to the
remote host. The process is symmetrical.
Proxy ARP is disabled by default. To enable proxy ARP on an interface, use the commands:
To disable Proxy ARP on an interface, use the command:
To check Proxy ARP is enabled on an interface, use the show running-config command. If
Proxy ARP has been enabled an entry shows ip proxy-arp below the interface it is enabled
on. No ip proxy-arp entry below an interface in the config indicates Proxy ARP is disabled on
it.
See the sample configuration commands and validation command with resulting output
showing proxy ARP enabled on VLAN 2 below:
awplus#configure terminal
awplus(config)#interface vlan2
awplus(config-if)#ip proxy-arp
awplus(config-if)#end
awplus(config)#exit
awplus#show running-config
!
interface vlan2
ip proxy-arp
22.4
awplus(config-if)#no arp <ip-address>
clear arp-cache
awplus(config)#
show arp
awplus(config)#
routes
OSPF neighbor status
BGP peer status
the TCP/UDP connection status
VRRP status
awplus(config)#interface IFNAME
awplus(config-if)#
awplus(config-if)#
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
ip proxy-arp
no ip proxy-arp
C613-50007-01 REV B