On Thu, Apr 4, 2013 at 1:43 PM, Randy Bush <randy@psg.com> wrote:
Even if the exchange does not advertise the exchange LAN, it's probably the case that it is in the IGP (or at least IBGP) of everyone connected to it,
yikes! this is quite ill-advised and i don't know anyone who does this, but i think all my competitors should.
Its more common than uncommon.
At WIX (Wellington), 64 out of 93 members will carry packets destined to APE (Auckland Exchange). (source: http://conference.apnic.net/__data/assets/pdf_file/0018/50706/apnic34-mike-j...) and this is just New Zealand!
Just checked a few exchanges, not just are the IXP ranges being carried, they're being leaked:
i am not unhappy by the exchange mesh being carried within a member and being propagated to their customer cone, see my nanog preso of feb 1997 and leo's recent post. it's putting such things in one's igp that disgusts me. as joe said, igp is just for the loopbacks and other interfaces it takes to make your ibgp work. randy