We have one AS and another ISP in the same CoLo facility has another AS, each with separate IP blockes from RIPE.
We want to act as backup for each other so if our core router dies theirs takes over and the world sees us through them and vica-versa.
Under normal conditions we both have upstreams but need to create a solid failover method.
What is the best way to achieve this?
Any code snippets greatly appreciated.
Gary