Adding the ssh command-line option to support dss is certainly one solution but RouterOS has supported rsa since version 6.31 which was released Aug 14, 2015
Perhaps a better solution would be to update RouterOS on the Mikrotik switch. This can be done by ensuring internet connectivity to the switch, visiting the router's IP in a web browser, and clicking Check for Updates.
Adding the ssh command-line option to support dss is certainly one solution but RouterOS has supported rsa since version 6.31 which was released Aug 14, 2015
Perhaps a better solution would be to update RouterOS on the Mikrotik switch. This can be done by ensuring internet connectivity to the switch, visiting the router's IP in a web browser, and clicking Check for Updates.