It is likely that level3 is aggregating your route, but tw can't. Longest match wins.
-- Jakob Heitz. > Date: Wed, 29 Jan 2014 03:32:17 -0800 > From: Joseph Jenkins <j...@breathe-underwater.com> > > I am seeking some feedback/help with my BGP configuration. I am peering with > two providers level3 and tw. Unfortunately all of my address spaces are > preferring the route over tw rather than level3. I have tried Prepending my > AS and the carriers AS to the path on the tw side and I see those update > being accepted by internet routers, but everyone is still preferring to > install the tw routes rather than level3. I was trying to advertise each > provider's address space out their connections and then use the other for > backup. Now however everything is coming in through tw and no one seems to > like level3. > > > Thanks in advance for any guidance or assistance. > > Joe
