LTM : virtual server in different subnet than a vlan --> possible

I would disable arp on the VIPs in question, yes. The GARP mechanism is basically this: when BigIP fails over, it'll issue a gratuitous arp on the network. It'll do this for all of the addresses that it owns, with the idea that all of the devices in each vlan will update their tables and forward to the new active device. In large environments this can be a lot of arp traffic. The method described above can help avoid this type of arping, as the BigIP will only arp out for the floating self-ips in the event of a failover.

 

 

-Matt