Running SSH server on more than one port could be helpful if your SSH server is connected to multiple networks, requiring your SSH server to listen on different ports …
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SSH server, by default, listens to port 22, and you don't have to manually specify the port number on your SSH client if you're connecting to the server's default …
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You can make your SSH server to run on multiple ports by adding more of the Port options in your SSHd the configuration file.
For example, having these lines in /etc/ssh/sshd_config will make the SSH server to run on both port 22 and 2222.
Port 22 Port 2222
You’ll need to reboot your SSH server after making the change.
