3Com Switch 4800G 24-Port - 55 Proxy Arp Configuration; Proxy ARP Overview; Enabling Proxy ARP; Displaying and Maintaining Proxy ARP

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PROXY ARP CONFIGURATION
When configuring proxy ARP, go to these sections for information you are
interested in:
■ “Proxy ARP Overview” on page 787
■ “Enabling Proxy ARP” on page 787
■ “Displaying and Maintaining Proxy ARP” on page 787
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 VLAN 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 on a
switch need to implement Layer 3 communication.
■ With the isolate-user-vlan function enabled on a device attached to a switch,
devices in different secondary VLANs need to implement Layer 3
communication.
Enabling Proxy ARP Follow these steps to enable proxy ARP or enable local proxy ARP in VLAN
interface view:
Displaying and
Maintaining Proxy
ARP
To do… Use the command… Remarks
Enter system view system-view -
Enter VLAN interface view interface Vlan-interface
vlan-id
Required
Enable proxy ARP proxy-arp enable Required
Disabled by default.
Enable local proxy ARP local-proxy-arp enable Required
Disabled by default.
To do… Use the command… Remarks
Display whether proxy ARP is
enabled
display proxy-arp [ interface
Vlan-interface vlan-id ]
Available in any view