Enabling local proxy ARP
When the local proxy ARP option is enabled, a switch responds with its MAC address to all ARP request on the VLAN. All IP packets are routed through and forwarded by the switch. The switch prevents broadcast ARP requests from reaching other ports on the VLAN.
Internet control message protocol (ICMP) redirects are disabled on interfaces on which local proxy ARP is enabled.
To enable local proxy ARP, you must first enter VLAN context, for example:
switch(config) vlan 1
Then enter the command to enable local proxy ARP:
switch(vlan-1)ip local-proxy-arp
Syntax:
[no] ip local-proxy-arp
Enables the local proxy ARP option. You must be in VLAN context to execute this command.
When enabled on a VLAN, the switch responds to all ARP requests received on the VLAN ports with its own hardware address.
The no
option disables the
local proxy ARP option.
Default: Disabled
Execute the show ip
command
to see which VLANs have local proxy ARP enabled.
Local proxy ARP is enabled on the default VLAN
switch(vlan-1)# show ip Internet (IP) Service IP Routing : Disabled Default TTL : 64 Arp Age : 20 Domain Suffix : DNS server : VLAN | IP Config IP Address Subnet Mask Proxy ARP -------------------- + ---------- --------------- --------------- --------- DEFAULT_VLAN | DHCP/Bootp 15.255.157.54 255.255.248.0 Yes Yes VLAN2100 | Disabled