Cisco configure SSH

Prerequisites

The Cisco IOS image used must be a k9(crypto) image in order to support SSH.

Configure using aaa new-model

!--- The aaa new-model command causes the local username and password on the router
!--- to be used in the absence of other AAA statements.
aaa new-model
username cisco password 0 cisco
!--- Instead of aaa new-model, you can use the login local command.
!--- assign domain name to the router/switch, this will be used to sign off SSH key
ip domain-name rtp.cisco.com
ip ssh version 2
!--- Generate an SSH key to be used with SSH here 1024bit long
crypto key generate rsa 1024
ip ssh time-out 60
ip ssh authentication-retries 2

line vty 0 4 
!--- Prevent non-SSH Telnets.
transport input ssh

References

• Configuring Secure Shell on Routers and Switches Running Cisco IOS