开启SNMP服务
SW_21_251(config)#snmp-server community public RO
SW_21_251(config)#snmp-server enable traps
SW_21_251(config)#snmp-server host 10.80.21.188 public
VTY密码加密
SW_21_251(config)#service password-encryption
banner配置
SW_21_251(config)#banner motd # Welcome CT_Switch 10.80.21.251!#
