Coming to the RSA token integration with the Radius management involving Extreme hardware does not have any support for this yet.
So far what we know is CLI only supports username/password, not any other option though. Moreover we can do by configuring public key authentication using the CLI in EXOS for the admin user. This will also allow users to login without a password using a public-private SSH key. But again this is very much with SSH and not with anymore console or telnet application.