Cisco ASDM 7.8 web界面上已经取消monitor mgmt口 。failover一起来就会同步mgmt地址,请问怎么限制这个同步

思科防火墙 AS模式双机配置
主设备配置如下:
ciscoasa(config)#failover
ciscoasa(config)#failover lan unit primary
ciscoasa(config)#failover lan interface Active GigabitEthernet0/5
ciscoasa(config)#failover link statelink GigabitEthernet0/7
ciscoasa(config)#failover interface ip folink 192.168.10.1 255.255.255.252 standby 192.168.10.2
ciscoasa(config)#failover interface ip statelink 192.168.20.1 255.255.255.252 standby 192.168.20.2
ciscoasa(config)# interface gigabitEthernet 0/5
ciscoasa(config-if)# no shutdown
ciscoasa(config)# interface gigabitEthernet 0/7
ciscoasa(config-if)# no shutdown
备设备配置如下:
ciscoasa(config)#failover
ciscoasa(config)#failover lan unit secondary
ciscoasa(config)#failover lan interface Active GigabitEthernet0/5
ciscoasa(config)#failover link statelink GigabitEthernet0/7
ciscoasa(config)#failover interface ip folink 192.168.10.1 255.255.255.252 standby 192.168.10.2
ciscoasa(config)#failover interface ip statelink 192.168.20.1 255.255.255.252 standby 192.168.20.2
ciscoasa(config)# interface gigabitEthernet 0/5
ciscoasa(config-if)# no shutdown
ciscoasa(config)# interface gigabitEthernet 0/7
ciscoasa(config-if)# no shutdown