PLANET XGS3-24040 - Manual (Page 206)

Chapter 26 Gratuitous ARP Configuration
26-2
26.3 Gratuitous ARP Configuration Example
Figure 6-1 Gratuitous ARP Configuration Example
For the network topology shown in the figure above, interface VLAN10 whose IP address is 192.168.15.254
and network address mask is 255.255.255.0 in the switch system. Three PCs – PC3, PC4, PC5 are
connected to the interface. The IP address of interface VLAN 1 is 192.168.14.254, its network address mask
is 255.255.255.0. Two PCs – PC1 and PC2 are connected to this interface. Gratuitous ARP can be enabled
through the following configuration:
1. Configure two interfaces to use gratuitous ARP at one time.
Switch(config)#ip gratuitous-arp 300
Switch(config)#exit
2. Configure gratuitous ARP specifically for only one interface at one time.
Switch(config)#interface vlan 10
Switch(CONFIG-if-VLAN10)#ip gratuitous-arp 300
Switch(CONFIG-if-VLAN10)#exit
Switch(config) #exit
26.4 Gratuitous ARP Troubleshooting
Gratuitous ARP is disabled by default. And when gratuitous ARP is enabled, the debugging information about
ARP packets can be retrieved through the command debug ARP send.
If gratuitous ARP is enabled in global configuration mode, it can be disabled only in global configuration mode.
If gratuitous ARP is configured in interface configuration mode, the configuration can only be disabled in
interface configuration mode.
PC1 PC2 PC3 PC4 PC5
Switch
Interface vlan1
192.168.14.254
255.255.255.0
Interface vlan10
192.168.15.254
255.255.255.0