F5 Gratuitous-ARP issue when failover

would anyone be able to help me find documentation on the exact behavior of the standby unit when a failover occurs? More specifically, if you force to standby the active unit, which now will become the new standby, what should it be doing in regards to sending garp requests during the failover event? Should it not send any garps at all or is it expected that it will send out garps while the new active unit is also sending out garp's. This is for virtual servers and snats. Is there any documentation specifically on this? And if the standby unit were to send garps but shouldn't, then why is it doing so? Thanks