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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 9 Configuring Switch-Based Authentication
Configuring the Switch for Secure Shell
To delete the RSA key pair, use the crypto key zeroize rsa global configuration command. After the
RSA key pair is deleted, the SSH server is automatically disabled.
Configuring the SSH Server
Beginning in privileged EXEC mode, follow these steps to configure the SSH server:
To return to the default SSH control parameters, use the no ip ssh {timeout | authentication-retries}
global configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip ssh version [1 | 2] (Optional) Configure the switch to run SSH version 1 or SSH version 2.
• 1—Configure the switch to run SSH version 1.
• 2—Configure the switch to run SSH version 2.
If you do not enter this command or do not specify a keyword, the SSH
server selects the latest SSH version supported by the SSH client. For
example, if the SSH client sports SSHv1 and SSHv2, the SSH server
selects SSHv2.
Step 3
ip ssh {timeout seconds |
authentication-retries number}
Configure the SSH control parameters:
• Specify the time-out value in seconds; the default is 120 seconds. The
range is 0 to 120 seconds. This parameter applies to the SSH
negotiation phase. After the connection is established, the switch uses
the default time-out values of the CLI-based sessions.
By default, up to five simultaneous, encrypted SSH connections for
multiple CLI-based sessions over the network are available (session 0
to session 4). After the execution shell starts, the CLI-based session
time-out value returns to the default of 10 minutes.
• Specify the number of times that a client can re-authenticate to the
server. The default is 3; the range is 0 to 5.
Repeat this step when configuring both parameters.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip ssh
or
show ssh
Display the version and configuration information for your SSH server.
Display the status of the SSH server connections on the switch.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.