Cisco Router KB Entries

Routing Basics

Routers far away can be safely configured by using a reload command first.
Before any configuration changes are made, issue a reload command to the remote router:
reload in 30 [This command instructs the router to reboot in 30 minutes.]
or reload at 06:00 [This command instructs the router to reboot at 6 'o clock.]
Proceed to configure the router as needed. As long as no configuration changes are saved, the router will revert to its previous configuration when it reloads.
If configuration changes are successful:
reload cancel [will stop the pending reload]
If configuration changes cause a loss of connectivity, the local side can be easily reset to the previous configuration. When the router reloads, connectivity will be restored.

How to configure SNMP community strings

Configuring SNMP in Cisco Routers

Cisco Design Technotes including DNS and SNMP

Configuring Passwords and Privileges

Cisco IOS Basics

Undocumented Cisco Commands

Howto apply Access-Lists to dial interfaces with a RADIUS server