H3C Technologies H3C S10500 Series Switches - Manual (Page 27)

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Local proxy ARP
As shown in Figure 8 , Host A and Host B belong to VLAN 2, but are isolated at Layer 2. Host A connects
to GigabitEthernet 1/0/3 while Host B connects to GigabitEthernet 1/0/1. Enable local proxy ARP on
Switch A to allow Layer 3 communication between the two hosts.
Figure 8 Application environment of local proxy ARP
Enable local proxy ARP in each of the following cases:
• Hosts connecting to different isolated Layer 2 ports in the same VLAN need to communicate at Layer
3.
• If a super VLAN is configured, hosts in different sub VLANs of the super VLAN need to communicate
at Layer 3.
• If an isolate-user-VLAN is configured, hosts in different secondary VLANs of the isolate-user-VLAN
need to communicate at Layer 3.
Enabling proxy ARP
Follow these steps to enable proxy ARP in VLAN interface view/Layer 3 Ethernet port view/Layer 3
Ethernet subinterface view/Layer 3 aggregate interface view/Layer 3 aggregate subinterface view:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Enable proxy ARP proxy-arp enable
Required
Disabled by default.
Follow these steps to enable local proxy ARP in VLAN interface view/Layer 3 Ethernet port view/Layer
3 Ethernet subinterface view/Layer 3 aggregate interface view/Layer 3 aggregate subinterface view:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—