2011/11/28 Gert Doering <[email protected]> > Hi, > > On Mon, Nov 28, 2011 at 11:41:08AM -0500, Keegan Holley wrote: > > That wasn't centered around aggregates and no. Some of us don't run > > gigantic intercontinental ISP's :) So yes us lowly Tier-II and Tier-III > > AS's may on occasion learn our own routes from an external connection. > > These lowly ASes urgently need to implement anti-bogon filters on their > eBGP sessions. NEVER EVER accept prefixes belonging to your address > space from the outside. > > That's crap. You will need to do it to have customers multi-home with your ARIN space for one. Secondly those outside AS's may belong to your company a sister company or an acquisition and you may want to use the eBGP path as a backup. That's just what I can come up with off the top of my head. There are more nefarious uses such as offloading traffic to a partner or an IX to avoid having to upgrade core links. Also, I don't need my routing vendor to try to think for me, I'd rather have one that's flexible.
Whether eBGP is preferred over iBGP is completely irrelevant on this > topic, as someone could always fat-finger a more specific of your > aggregate, and that would always win, no matter what. > ... > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
