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 ...
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