Layer 3 Forward Configuration
238
24.5
ARP
24.5.1
Introduction to ARP
ARP (Address Resolution Protocol) is mainly used to resolve IP address to Ethernet
MAC
address.
Switch
supports
both
dynamic
ARP
and
static
ARP
configuration.Furthermore, switch supports the configuration of proxy ARP for some
applications. For instance, when an ARP request is received on the port, requesting an IP
address in the same IP segment of the port but not the same physical network, if the port
has enabled proxy ARP, the port would reply to the ARP with its own MAC address and
forward the actual packets received. Enabling proxy ARP allows machines physically
separated but of the same IP segment ignores the physical separation and communicate
via proxy ARP interface as if in the same physical network.
24.5.2
ARP Configuration Task List
ARP Configuration Task List:
1. Configure static ARP
2. Configure proxy ARP
3. Clear dynamic ARP
4. Clear the statistic information of ARP messages
1. Configure static ARP
Command
Explanation
VLAN Interface Mode
arp
<ip_address> <mac_address>
{interface [ethernet] <portName>}
no arp <ip_address>
Configures a static ARP entry; the no
command deletes a ARP entry of the
specified IP address.
2.
Configure proxy ARP
Command
Explanation
VLAN Interface Mode
ip proxy-arp
no ip proxy-arp
Enables the proxy ARP function for
Ethernet ports: the no
command disables
the proxy ARP.