374
E
ES4710BD 10 Slots L2/L3/L4 Chassis Switch
17.3.2.2.2 ip
proxy-arp
Command: ip proxy-arp
no ip proxy-arp
Function:
Enables proxy ARP for VLAN interface; the “no ip proxy-arp” command disables proxy
ARP.
Default:
Proxy ARP is disabled by default.
Command mode:
VLAN Interface Mode
Usage Guide:
When an ARP request is received on the layer 3 interface, requesting an IP address in
the same IP segment of the interface but not the same physical network, and the
proxy ARP interface has been enabled, the interface will reply to the ARP with its
own MAC address and forward the actual packets received. Enabling this function
allows machines to physically be separated but in the same IP segment and
communicate via the proxy ARP interface as if in the same physical network. Proxy
ARP will check the route table to determine whether the destination network is
reachable before responding to the ARP request; ARP request will only be responded
if the destination is reachable. Note: the ARP request matching default route will not
use proxy.
Example:
Enabling proxy ARP for VLAN 1.
Switch(Config-If-Vlan1)#ip proxy-arp
17.3.3 ARP Forwarding Troubleshooting Help
17.3.3.1 Monitor and Debug Commands
17.3.3.1.1 show
arp
Command: show arp [<
ip-addr
>][<
vlan-id
>][<
hw-addr
>][type {static|dynamic}][count] }
Function:
Displays the ARP table.
Parameters:
<ip-addr>
is a specified IP address;
<
vlan-id
>
stands for the entry for the identifier of
specified VLAN;
<
hw-addr
>
for entry of specified MAC address; “static” for static
ARP entry; “dynamic” for dynamic ARP entry; “count” displays number of ARP
entries.
Command mode:
Admin Mode
Usage Guide:
Displays the content of current ARP table such as IP address, MAC address,
hardware type, interface name, etc.
Example:
Switch#sh arp
Total arp items: 3, matched: 3, Incomplete: 0
Address Hardware Addr Interface Port Flag
50.1.1.6 00-0a-eb-51-51-38 Vlan50 Ethernet3/11 Dynamic
