There is really no feature in IOS to do this. What you would need would be a Cisco product called Local Director.
As a workaround, you could however use NAT in the router. By mapping a static NAT translation to the primary web server's address and then having a script monitoring the availability of that local address by pinging it. If the ping fails, it could then kick of a script to delete the static NAT translation to the primary server and add one for the same global address but pointing to the backup server's local address.
Could you please give me some further informatio on how should I implement this script. It is possible to run a script on a cico router 2611XM?Or I run the script on another host and with a tftp put a new configuration?
Thanks for your advices but ufortunately I can afford( for the moment) to use any of the software you have mentioned. Linux-ha it's probably free but I am using W2K. So I'm looking for an aproach with a minimum down time in such conditions. Do you have any other suggestions?
Your best bet may be to have your DNS server(s) respond to queries for the web server's IP address with both the primary server's IP and the backup server's IP. Most web browsers will note that multiple IP addresses have been returned in the DNS response and, if the first one they try doesn't respond, will start trying alternate IP's within a minute.
Note that the order in which DNS returns multiple IP addresses is random, so you'll need to have both web servers active at all times, and traffic will be load balanced between them.
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