cisco 设备上配置telnet enable 不需要密码，直接进入特权

Switch(config)#username cxw privilege 15 password 123.com

Switch(config)#line vty 0 4
Switch(config-line)#login local
Switch(config-line)#exit

Switch(config)#int vlan 1
Switch(config-if)#ip add 192.168.1.1 255.255.255.0
Switch(config-if)#no shut

PC>telnet 192.168.1.1
Trying 192.168.1.1 ...Open

User Access Verification

Username: cxw
Password:
Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#A