Manual

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28.3 Gratuitous ARP Configuration Example
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. Five PCs –
PC1, PC2, PC3, PC4, PC5 are connected to the interface. Gratuitous ARP can be enabled
through the following configuration:
1. Configure global gratuitous ARP
Switch(config)#ip gratuitous-arp 300
Switch(config)#exit
2. Configure interface gratuitous ARP
Switch(config)#interface vlan 10
Switch(Config-if-Vlan10)#ip gratuitous-arp 300
Switch(Config-if-Vlan10)#exit
Switch(config) #exit
28.4 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
PC1
PC2
PC3
PC4
PC5
Switch
Interface vlan10
192.168.15.254
255.255.255.0