TCL script for changing interfaces

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Hello,

I need some help. Does anyone has an example of a TCL script for a cisco 1800 series running ios 12.4 how can switch between interfaces if one fails

To be more specific, i have 2 ISP configured on 2 Fast Ethernet ports.
If one fails i want the ip route to switch to the other interface.
I don`t want to manually switch ip route 0.0.0.0 0.0.0.0 fast ethernet...

Thanks in advance !

 

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it should be possible just to use a floating static defualt route no?