David’s Cisco Networking Blog

Sep 22 2008   6:46AM GMT

Five ways that a Cisco router initiates a routing request out of an interface

David Davis David Davis Profile: David Davis

As I’m sure you know, a switch switches and a router routes. Among other things, It routes packets of data and it routes requests. Listed below are five ways that a router will automatically initiate a routing request.
1. The router has been booted or rebooted.
2. A primary IP address was changed. An interface has several secondary IP addresses but only one primary IP address. If that IP address has been changed, the router will start a routing request out its interface.
3. Of course, if the interface goes down this will automatically cause a routing request.
4. If you make a change to the router’s configuration such as an IP address change.
5. If you issue the clear ip route command.

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