My customer is having 2821 router and he was having 4 isps terminated on the same router and iam attaching the existed router config and iam having the contract no also.So plz help me the isp failover config in this router.
First of all , remove the passwords and Live IPs from your config., this system can be hacked anytime.
There are ways to configure redundancy using following:
(1)The first solution is using BGP.Get AS numbers from your ISPs. Configure BGP on yoyr Router. This will provide both redundancy as well as load-sharing.(your second ISP wont go waste if first is working.)
(2)The second way is using floating static routes. Give the administrative distance of your second ISP greater then your primary ISP.
For eg :
ip route 0.0.0.0 0.0.0.0 s0.1
ip route 0.0.0.0 0.0.0.0 s0.2 50
So if first ISP is down, then the second route will come to effect.
Hope this will help.