Arp timeout?

John Blakley · ‎09-24-2008

Is there a way of changing the refresh time on the arp cache? We had a situation today where a VM failed over, and the other VM wasn't seen until I cleared the arp table on the switch. Is this a configuration problem with the switch or the VM?

This is a 3750

Thanks!

John

HTH, John *** Please rate all useful posts ***

Giuseppe Larosa · ‎09-24-2008

Hello John,

the default arp timeout is 4 hours but it can be changed

go on interface config and use arp timeout command

other thought:

check if the VM can send a gratuitos ARP when starting to work.

this is used for example when cisco routers running HSRP the new active router sends a gratuitos ARP to refresh the arp and cam tables.

Hope to help

Giuseppe