3Com MSR 50 Series, Configuration Manual

Page: 561 / 2443

31
P
ROXY
ARP C
ONFIGURATION
When configuring proxy ARP, go to these sections for information you are
interested in:
■
“Proxy ARP Overview” on page 561
■
“Enabling Proxy ARP” on page 561
■
“Displaying and Maintaining Proxy ARP” on page 562
Proxy ARP Overview
For an ARP request of a host on a network to be forwarded to an interface that is
on the same network but isolated at Layer 2 or a host on another network, the
device connecting the two physical or virtual networks must be able to respond to
the request. This is achieved by proxy ARP.
Proxy ARP implements Layer 3 communication between interfaces isolated at
Layer 2 or located on different networks.
In one of the following cases, you need to enable the local proxy ARP:
■
Devices connected to different isolated layer 2 ports in the same VLAN need to
implement layer 3 communication.
■
With the super VLAN function enabled, devices in different sub VLANs need to
implement layer 3 communication.
■
With the isolate-user-vlan function enabled, devices in different second VLANs
need to implement layer 3 communication.
Enabling Proxy ARP
Follow these steps to enable proxy ARP in VLAN interface view/Ethernet interface
view or enable local proxy ARP in VLAN interface view:
To do... Use the command... Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
Required
Enter VLAN interface/Ethernet
interface view to enable the
proxy ARP.
Enable proxy ARP proxy-arp enable Required
Disabled by default
Enable local proxy ARP local-proxy-arp enable Required
Disabled by default