We have two servers connected to the same 4500 Multilayer switch, the two servers are working in active/stanby mode using virtual IP address between the two servers. On the 4500 switch, the MAC address of the servers virtual IP is the MAC address of the active servers. When the active server fails, the arp table on the 4500 does not update the VIP address with the backup server, so no one is able to access the server, till we clear arp. I thought of changing the ARP time out from 4 hours (default) to something like 10 sec, but my concern is that could lead to many broadcast requests. Any idea?