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Generating SSH RSA/DSA keys on EX-Series switches and preserving them after upgrade/downgrade

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Article ID: KB21577 KB Last Updated: 04 Mar 2017Version: 2.0
Summary:
This article describes the procedure to generate SSH RSA/DSA keys on EX-Series switches and ways to retain them.
Symptoms:
During the upgrade/downgrade process, the SSH RSA/DSA keys will be deleted. The solution section explains how to retain the keys after upgrade/downgrade.
Solution:
We have to enable SSH service on the switch using the following command:
root@Juniper# set system services ssh

We can generate the SSH key on EX-Series switches by logging into the shell prompt as a root user:
root@Juniper>start shell
root@Juniper% ssh-keygen -t rsa

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
91:6e:b9:52:fd:14:85:1e:8c:40:9a:7c:2d:c7:d4:0d root@SW_Jaffa_Monitor_104
% ssh-keygen -t rsa/dsa

Once the keys are generated we can associate the key with the "userid" using the following command.
root@Juniper#set system login user <userid> uid 2000
root@Juniper#set system login user <userid> class super-user
root@Juniper#set system login user <userid> authentication load-key-file /root/.ssh/id_rsa.pub

After running the above configuration commands, it will create a directory with <userid> in /var/home and the authorized_key for SSH will be created.

When an upgrade/downgrade is performed, the files - id_rsa and id_rsa.pub, which are locally created and are not part of configuration, will not be restored. Hence we will have to copy the contents of the /root/.ssh directory and put them back after the upgrade/downgrade is complete. We also will have to associate the user with the key using the following CLI command:
root@Juniper#set system login user <userid> authentication load-key-file /root/.ssh/id_rsa.pub
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