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How to enable secure socket shell or ssh on Cisco Router or Switch

Posted: 2017-05-10

SSH or Secure Socket Shell, is a network protocol that provides network administrators/engineers with a secure way to access a remote router, switch or other network device. Secure Shell provides strong authentication and secure encrypted data communications between two communicating network devices. To enable SSH on cisco router or switch, issue the commands below: routerX # conf t rouerX (config) # ip domain-name <- Change to your own domain routerX (config) # username password routerX (config # crypto key generate rsa general-keys modulus 1024 routerX (config) # ip ssh version 2 Now, disabble telnet so SSH is the only method to remotely connect to the router or switch routerX (config) # line vty 0 4 routerX (config) # login local routerX(config-line) # transport input ssh Here is a actual demo of those commands on Cisco Router RouterX>en RouterX>enable RouterX#conf t RouterX(config)#ip domain-name spidertip.com RouterX(config)#username abdi password cisco RouterX(config)#crypto key generate rsa The name for the keys will be: RouterX.spidertip.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]: 1024 % Generating 1024 bit RSA keys, keys will be non-exportable...[OK] RouterX(config)#ip ssh version 2 RouterX(config)# RouterX#copy running-config startup-config RouterX# RouterX#conf t Enter configuration commands, one per line. End with CNTL/Z. RouterX(config)#line vty 0 4 RouterX(config-line)#login local RouterX(config-line)#transport input ssh RouterX(config-line)#

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