3com 5500-ei pwr Guia De Referência

 

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Use the display arp timer aging command to display the setting of the ARP aging time. 

Related commands: arp timer aging. 

# Display the setting of the ARP aging time. 

<Sysname> display arp timer aging 

 Current ARP aging time is 20 minute(s)(default) 

The displayed information shows that the ARP aging time is set to 20 minutes. 

VLAN interface view 

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Use the gratuitous-arp period-resending enable command to enable the VLAN interface to send 

gratuitous ARP packets periodically.  

Use the undo gratuitous-arp period-resending enable command to disable this function.  

By default, this function is enabled, the gratuitous ARP packets are sent at an interval of 30 seconds. 

After you enable a VLAN interface to send gratuitous ARP packets periodically, hosts on the network will 

timely update the ARP entry corresponding to the VLAN interface’s IP address, thus preventing it from 

being aged out. However, this function generates a large amount of ARP packets on the network; you 

can disable the VLAN interface from sending gratuitous ARP packets if receiving hosts can update a 

dynamic ARP entry when half of the entry’s aging time expires.  

# Disable VLAN-interface 1 on the switch from periodically sending gratuitous ARP packets. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z. 

[Sysname] interface Vlan-interface 1 

[Sysname-Vlan-interface1] undo gratuitous-arp period-resending enable