Hi,
I'm advertising a /24 from one of our new data centers to two providers. I'm getting only a default route back.
I'm trying to make one of the paths function as backup by prepending my own AS (three times). The problem is that some of the ISPs still prefer the longer AS path, as seen in a number of looking glass tools. Even though the longer AS is 3 ASNs longer. When I stop announcing it, the other one show up.
What could be the explanation? Are they manipulating the routing decision to favor some links / upstream networks?
