Configuring Proxy Arp; Proxy Arp Configuration Example - 3Com 7757 Configuration Manual

584 C 55: P
HAPTER ROXY

Configuring Proxy ARP

Proxy ARP
Configuration
Example
Proxy ARP Configuration
Example
ARP C
ONFIGURATION
VLAN-interface 3 of the switch, and then the switch routes the packets to Host
D, so as to realize the Layer 3 connectivity between Host A and Host D.
Proxy ARP is needed in the following cases (hosts have IP addresses of the same
network segment).
For hosts in different VLANs on a Switch 7750 to communicate, you need to
■
enable proxy ARP on the VLAN interfaces.
For hosts in different sub-VLANs of a super VLAN on a Switch 7750 to
■
communicate, you need to enable proxy ARP on the super VLAN interface.
For hosts in different secondary VLANs of an isolate-user-vlan on a Layer 2
■
switch that is connected to a Switch 7750 to communicate, you need to enable
proxy ARP on the Switch 7750.
n
Generally, ports in the same VLAN are interconnected at Layer 2 by default. So,
■
ARP proxy only processes inter-VLAN ARP requests and does not deal with
intra-VLAN ARP requests.
When isolate-user-vlan function is enabled on the Layer 2 switches connected
■
with the Switch 7750, ports in the same VLAN are isolated with each other at
Layer 2. To provide Layer 3 connectivity between Layer 2 isolated ports in the
same VLAN, you need to enable the intra-VLAN ARP proxy function on the
Switch 7750 to have ARP proxy process intra-VLAN ARP requests.
Table 460 Configure proxy ARP
Operation
Enter system view
Enter VLAN interface
view
Enable proxy ARP
Enable intra-VLAN
proxy ARP
Display the status of
ARP proxy
Network requirements
The IP address of PC A is 192.168.0.22/16, and that of PC D is
■
192.168.1.30/16.
Create VLAN 3 and VLAN 4 on the switch.
■
Command
system-view
interface Vlan-interface
vlan-id
arp proxy enable
arp proxy source-vlan
enable
display arp proxy
[ interface interface-type
interface-number ]
Description
-
-
Required
By default, proxy ARP is disabled.
Optional
By default, intra-VLAN proxy ARP is
disabled, and the proxy ARP only
processes inter-VLAN ARP requests.
Available in any view