Configuration manual

To configure the time or volume rekey threshold at which to re-generate the SSH key during an SSH
session, use the ip ssh rekey [time rekey-interval] [volume rekey-limit] command.
CONFIGURATION mode.
Configure the following parameters:
• rekey-interval: time-based rekey threshold for an SSH session. The range is from 10 to 1440 minutes.
The default is 60 minutes.
• rekey-limit: volume-based rekey threshold for an SSH session. The range is from 1 to 4096 to
megabytes. The default is 1024 megabytes.
Examples
The following example configures the time-based rekey threshold for an SSH session to 30 minutes.
Dell(conf)#ip ssh rekey time 30
The following example configures the volume-based rekey threshold for an SSH session to 4096
megabytes.
Dell(conf)#ip ssh rekey volume 4096
Configuring the SSH Server Key Exchange Algorithm
To configure the key exchange algorithm for the SSH server, use the ip ssh server kex key-
exchange-algorithm
command in CONFIGURATION mode.
key-exchange-algorithm : Enter a space-delimited list of key exchange algorithms that will be used by
the SSH server.
The following key exchange algorithms are available:
• diffie-hellman-group-exchange-sha1
• diffie-hellman-group1-sha1
• diffie-hellman-group14-sha1
The default key exchange algorithms are the following:
• diffie-hellman-group-exchange-sha1
• diffie-hellman-group1-sha1
• diffie-hellman-group14-sha1
When FIPS is enabled, the default is diffie-hellman-group14-sha1.
Example of Configuring a Key Exchange Algorithm
The following example shows you how to configure a key exchange algorithm.
Dell(conf)# ip ssh server kex diffie-hellman-group-exchange-sha1 diffie-
hellman-group14-sha1
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