3com 8807 User Guide

C

HAPTER

 55: ARP C

ONFIGURATION

To cancel the configuration, use the corresponding undo command.

After the configuration, you can use the display arp multi-port command in any 
view to check the detailed information about multicast ARP configuration.

c 

■

You cannot configure multicast ARP for aggregation ports. Otherwise, the 
system will prompt error message.

■

You cannot add a port in a multicast ARP entry to an aggregation group; if you 
want to do this, you must first delete the port from any multicast ARP entry it 
belongs to.

■

At present, the outgoing ports in the same multicast ARP entry cannot be in 
different modules.

■

Multicast static ARP can cover dynamic ARP, short static ARP and long static 
ARP, but not the other way around.

With the Super VLAN function enabled, the ARP proxy function is also needed to 
enable Layer 3 communications between sub-VLANs. If you enable the ARP proxy 
function for a network device that is connected to two networks simultaneously, 
the network device enables two ports in these two networks to communicate with 
each other on Layer 3 by forwarding ARP requests between the two networks 
even if the two ports are isolated from each other on Layer 2.

n 

Use the undo form of the command to cancel the configuration.

The following are the characteristics of gratuitous ARP packets:

■

Both source and destination IP addresses carried in a gratuitous ARP packet are 
the local addresses, and the source MAC address carried in it is the local MAC 
addresses.

Table 610   Add multicast ARP ports

Enter system view 

system-view 

- 

Add multicast ARP ports 

arp static ip-address mac-address vlan-id 
multi-port interface-type interface-number [ 
vpn-instance vpn-instance-name ] 

-

Table 611   Enable ARP proxy

Enter system view 

system-view 

- 

Enter VLAN view 

vlan vlan-id 

vlan-id is the ID of a VLAN 

Enable ARP proxy 

arp proxy enable 

By default, ARP proxy function 
is disabled.