bal_defs {  
   notification_email {  
         [email protected]  
   }  
   notification_email_from [email protected]  
   smtp_server 127.0.0.1
   smtp_connection_timeout 30
   router_id LVS_DEVEL  
}  
vrrp_instance VI_1 {  
    state MASTER
    interface eth1  
    virtual_router_id 51  
    priority 100
    advert_int 1  
    authentication {  
        auth_type PASS  
        auth_pass 1111  
    }  
    virtual_ipaddress {  
        192.168.20.200  
    }  
}  

virtual_server 192.168.20.200 12201 {  
    delay_loop 6 
    lb_algo rr 
    lb_kind DR 
    nat_mask 255.255.255.0                
    persistence_timeout 0          
    protocol  UDP                  
    real_server 192.168.20.206 12201 {  
        weight 1   
        UDP_CHECK {  
        connect_timeout 10         
        nb_get_retry 3  
        delay_before_retry 3  
        connect_port 12201  
        }  
    }  
    real_server 192.168.20.210 12201 {  
        weight 1  
        UDP_CHECK {  
        connect_timeout 10  
        nb_get_retry 3  
        delay_before_retry 3  
        connect_port 12201  
        }  
     }  
}

我的配置是一个lvs-master + 2个realserver
关掉其中一个realserver后，没有看到把请求转发到第二个realserver

请问有哪位高手知道是怎么回事？