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System Management Commands
4-35
4
This section describes the commands used to configure the SSH server. However,
note that you also need to install a SSH client on the management station when
using this protocol to configure the switch.
Note:
The switch supports both SSH Version 1.5 and 2.0 clients.
The SSH server on this switch supports both password and public key
authentication. If password authentication is specified by the SSH client, then the
password can be authenticated either locally or via a RADIUS or TACACS+ remote
authentication server, as specified by the authentication login command on
page 4-70. If public key authentication is specified by the client, then you must
configure authentication keys on both the client and the switch as described in the
following section. Note that regardless of whether you use public key or password
authentication, you still have to generate authentication keys on the switch and
enable the SSH server.
To use the SSH server, complete these steps:
1. Generate a Host Key Pair – Use the ip ssh crypto host-key generate
command to create a host public/private key pair.
2. Provide Host Public Key to Clients – Many SSH client programs automatically
import the host public key during the initial connection setup with the switch.
Otherwise, you need to manually create a known hosts file on the management
station and place the host public key in it. An entry for a public key in the known
hosts file would appear similar to the following example:
Table 4-15 Secure Shell Commands
Command Function Mode Page
ip ssh server Enables the SSH server on the switch GC 4-37
ip ssh timeout Specifies the authentication timeout for the SSH server GC 4-37
ip ssh
authentication-retries
Specifies the number of retries allowed by a client GC 4-38
ip ssh server-key size Sets the SSH server key size GC 4-38
copy tftp public-key Copies the user’s public key from a TFTP server to the switch PE 4-64
delete public-key Deletes the public key for the specified user PE 4-39
ip ssh crypto host-key
generate
Generates the host key PE 4-39
ip ssh crypto zeroize Clear the host key from RAM PE 4-40
ip ssh save host-key Saves the host key from RAM to flash memory PE 4-41
disconnect Terminates a line connection PE 4-19
show ip ssh Displays the status of the SSH server and the configured values
for authentication timeout and retries
PE 4-41
show ssh Displays the status of current SSH sessions PE 4-41
show public-key Shows the public key for the specified user or for the host PE 4-42
show users Shows SSH users, including privilege level and public key type PE 4-62