How to configure the automatic failover between two connection (access) internet in cisco routeur 2800 serie?
If you have 2 internet connections terminating on 2800 router, you can simply configure 2 default static route pointing to next hop and have load balance the traffic to Internet.
or, you can configure 2 default static route, one with default Administrative Distance (Your Primary ISP) and other with higher Administrative Distance (Secondary ISP) as below,
ip route 0.0.0.0 0.0.0.0
ip route 0.0.0.0 0.0.0.0 254