Installation guide

Command Line Interface
4-122
4
Secure Shell Commands
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.
Configuration Guidelines
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 4-98. 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.
Table 4-37 SSH Commands
Command Function Mode Page
ip ssh server Enables the SSH server on the switch GC 4-124
ip ssh timeout Specifies the authentication timeout for the SSH server GC 4-125
ip ssh
authentication-retries
Specifies the number of retries allowed by a client GC 4-125
ip ssh server-key size Sets the SSH server key size GC 4-126
copy tftp public-key Copies the user’s public key from a TFTP server to the switch PE 4-35
delete public-key Deletes the public key for the specified user PE 4-126
ip ssh crypto host-key
generate
Generates the host key PE 4-127
ip ssh crypto zeroize Clear the host key from RAM PE 4-127
ip ssh save host-key Saves the host key from RAM to flash memory PE 4-128
disconnect Terminates a line connection PE 4-48
show ip ssh Displays the status of the SSH server and the configured values
for authentication timeout and retries
PE 4-128
show ssh Displays the status of current SSH sessions PE 4-129
show public-key Shows the public key for the specified user or for the host PE 4-130
show users Shows SSH users, including privilege level and public key type PE 4-31