Backup interface problem

[Lavanholy]

Hi,

I have a Cisco 2811 router,which has 2 fastethernet ports ,WIC-1T card.

1. WIC-1T is connected to teh ISP by means of 128KB leased line.

2. Fastethernet 0 is configured with Public STatic IP and connected to a switch,where 5 usres are connected with public IP.

3. Then the second fastethernet 1 interface is connected to a ADSL modem provided by the same ISP.

Now I want to configure this fastethernet 1 as the backup interface for teh Serial interface.

Please guide me how to achieve this.

Thanks and Regards,

S.Venkataraman

[b.speltz]

Configuring floating static routes to make this interface as a backup to serial interface.For xample ip route 0.0.0.0 0.0.0.0 ,ip route 0.0.0.0 0.0.0.0

[ppalmerjr]

Do not think this will work. You will have to change the administrative distance on one of these default routes.