keepalived use vmac and bonding nic issue

I use keepalived with vmac and bonding nic.
It take over 30 sec to failover.
After mark vmac_xmit_base. it work perfect.
But keepalived will random forward request to server.


! Configuration File for keepalived
vrrp_instance VI_1 {
    state BACKUP
    interface bond0
    track_interface {
     bond0
    }

    virtual_router_id 51
    priority 16
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
   use_vmac
#   vmac_xmit_base
   virtual_ipaddress {
      192.168.65.200
    }
}