3com WX3000 Manuel D’Utilisation

 

1-7 

Quit to system view 

— 

Enter VLAN view  

vlan vlan-id 

— 

Enable ARP restricted 
forwarding 

Optional 

By default, the ARP restricted 
forwarding function is disabled. 
The device forwards legal ARP 
packets through all its ports. 

 

z 

You need to enable DHCP snooping and configure DHCP snooping trusted ports on the device 

before configuring the ARP attack detection function. For more information about DHCP snooping, 

refer to the DHCP snooping section in the part discussing DHCP in this manual. 

z 

Generally, the uplink port of a device is configured as a trusted port.  

z 

Before enabling ARP restricted forwarding, make sure you enable ARP attack detection and 

configure ARP trusted ports. 

z 

You are not recommended to configure ARP attack detection on the ports of an aggregation group. 

 

Follow these steps to configure the gratuitous ARP: 

Enter system view 

— 

Enable the gratuitous ARP 
packet learning function 

Optional 

By default, the gratuitous ARP 
packet learning function is 
enabled. 

 

The sending of gratuitous ARP packets is enabled as long as a device operates. No command is 

needed for enabling this function. That is, the device sends gratuitous ARP packets whenever a VLAN 

interface is enabled (such as when a link is enabled or an IP address is configured for the VLAN 

interface) or whenever the IP address of a VLAN interface is changed.