配置console  server时，配置模板如下

 异步口配置如下：

         physical-mode async

         async mode flow

         undo detect dsr-dtr

         ip address ppp-negotiate

user-interface tty配置如下：

         undo shell                                                                    

flow-control none                                                             

redirect enable     

redirect refuse-negotiation                                                         

redirect return-deal from-telnet                                              

undo redirect timeout                                                         

redirect listen-port 5603