Cisco Routers for the Desperate, 2nd Edition

Usernames

While global passwords are sufficient to protect your router from the most ignorant network intruders, you will probably want to secure the remote command-line access to the router. Cisco provides Secure Shell (SSH) server for secure remote administration. SSH requires that each user have a username. In large networks, you can use usernames to assign different users different privilege levels on each router as required.

Each user needs a username, a password, and a privilege level. Privilege levels range from 1 (unprivileged EXEC) to 15 (privileged EXEC). To create a username, just go into configure mode and enter all the information.

router(config)# username mwlucas
 privilege
 15 password
 mwlucas-password
router(config)# username kgball ...