Stop! Physical Security
A basic way to secure your device is to limit physical access to it. This precaution prevents someone from accidentally or deliberately turning off the router or removing or replacing cables and power cords connected to the router.
Also, anyone who has physical access to a router can connect to the router's console port. If someone manages to log in as the root user, that person can take control of the router, issuing any and all commands and modifying the router configuration.
Keep your routers in an area with restricted access, such as a locked room or a room that requires badge access. then limit the number of people who have access to that area. this advice may seem like basic stuff, but you'd be surprised at the number of routers operating in the corner of some administrator's open cube.
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