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针对最常见的思科（cisco）企业级路由器产品，下文将介绍其登录模式。包括Console端口线路配置、虚拟终端线路配置和使用SSL协议登录的方法。登陆过程中，需要配置域名并且开启SSH功能，也需要配置密钥长度和创建账户，最后有登陆成功之后的截图。
Console端口线路配置：
Router(config)#hostname R1
R1(config)#int f0/0
R1(config-if)#ip add 192.168.1.254 255.255.255.0
R1(config-if)#no shut
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
R1(config)#line con 0
R1(config-line)#pass
R1(config-line)#password 12346
R1(config-line)#login
R1(config-line)#logg syn //光标同步
R1(config-line)#exec-timeout 0 0 //永远不超时
R1(config-line)#exit
虚拟终端线路配置：
R1(config)#line vty 0 4
R1(config-line)#password cisco
R1(config-line)#login
R1(config-line)#exit
R1(config)#username admin password cisco
R1#wri
Building configuration...
[OK]
R1#reload
使用SSL协议登录：
R1(config)#ip domain-name abc.com //配置域名
R1(config)#crypto key generate rsa //开启SSH功能
The name for the keys will be: R1.abc.com
Choose the size of the key modulus in the range of 360 to 2048 for your
General Purpose Keys. Choosing a key modulus greater than 512 may take
a few minutes.
How many bits in the modulus [512]: //配置密钥长度
% Generating 512 bit RSA keys, keys will be non-exportable...[OK]
R1(config)#user
*?? 1 0:7:39.609: RSA key size needs to be at least 768 bits for ssh version 2
*?? 1 0:7:39.609: %SSH-5-ENABLED: SSH 1.5 has been enabled
R1(config)#username admin secret cisco //创建账户
ERROR: Can not have both a user password and a user secret.
Please choose one or the other.
R1(config)#line vty 0 4
R1(config-line)#transport input all
R1(config-line)#login
登录如图所示：
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