Manual

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Москва, Новозаводская ул., 18, стр. 1
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21.3 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. 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:
Configure two interfaces to use gratuitous ARP at one time.
Switch(config)#ip gratuitous-arp 300
Switch(config)#exit
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
21.4 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