why active unit can not learn arp info of standby's selfip

Hi everybody,

 

 

I have 2 ltms with HA paire. I add a new vlan 608 on them,and assign self ip to them.

 

 

I could get response when i run ping from standby to active unit selfip,but it was not success when opposite direction.

 

 

Any ping to old self ip is ok (bidirection)

 

 

Active unit can not learn MAC of standby self ip .If i static configed it, then all ok.

 

 

Who can tell me why:

 

why active unit can response standby's ping if not have it arp (because autolasthop?)

 

why active unit could not learn arp info of standby's selfip that new added.