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New Member

Fail Over Support

I have an issue that I am trying to get resolved with regards to fail over. Here is an overview of my network design and I will list what I am trying to accomplish.

Current Design:

I have 2 Internet connections one of which is a T1 attached to a Cisco 1601 router with a firewall protecting the internal network. The second connection is a Microwave connection attached to a PC performing routing. I have drawn a rudimentary design below of our current configuration.


Internet |


What we want to accomplish is to have some type of failover in place for our Internet connections. We have purchased a Cisco 2611 with an extra eth port to accomplish this task.

Future Design:

I would like to place the 2611 connecting both of our Internet lines into the 2611. I would like to know how I can configure this scenario to provide fail over support for the 2 Internet lines. Can the 2611 provide this capability? How would I configure the 2611 to use the T1 by default and then the microwave if T1 fails.


Internet | >----2611----Firewall


Any help would be greatly appreciated.



  • Other Network Infrastructure Subjects
New Member

Re: Fail Over Support

Hi Lee,

you should be able to use the backup interface command to set the microwave interface into standby mode. When the t1 fails it simply kicks in the microwave interface. example:

interface s0/0 (using s0/0 as T1 example)

ip addresss ####.####.###

backup interface bri0/0 ( isdn backup) (using bri0/0 as microwave example)

backup delay 30 60

no shut