Alcatel Carrier Internetworking Solutions 6648 - Manual (Page 173)

Troubleshooting ARP Advanced ARP Troubleshooting
OmniSwitch Troubleshooting Guide September 2005 page 11-7
Some devices may be silent like printers. They ARP at the time of the bootup but after that they do not
ARP at all. In order to accommodate those devices OmniSwitch allows different choices:
• To increase the ARP time out value. By default the ARP timeout value is set for 300 seconds. It can be
increased up to 1200 seconds using the following command:
-> arp time-out 1200
• MAC Address aging time can also be increased from the default value of 300 seconds to any higher
value using the following command:
-> mac-address-table aging-time
• Silent devices MAC address can be added in the MAC address table as permanent using the following
command:
-> mac-address-table permanent 08:00:20:a8:f0:8a 16/2 10 bridging
Refer to Source learning section for more details about permanent MAC entries.
If the ARP cache of the switch is not showing the correct ARP entries for the edge devices then the
following command can be used to clear the ARP table and re-learn all the ARP entries:
-> clear arp-cache
Note. Clearing the ARP cache might cause a slight interruption in the network, if done at peak hours and
on the Core switch. This will re invoke the process of ARP learning for each and every devices associated
with that particular switch.