Canadian routes with BGP no-export communities

Sean Donelan SEAN at SDG.DRA.COM
Thu Jun 6 23:17:06 UTC 1996

Does anyone know what's going on in Canada?

In the last couple of weeks fONOROLA/ changed how they
announce aggregated networks.  Now fONOROLA is sending some more
specific network announcements for multi-homed networks in
with a "no-export" BGP community to MCI, and ANS.

As long as you only connect with MCI or ANS, and use their IGP,
things look pretty typical because the more specifics are carried
internally.  But if you use BGP, the no-export means any peers
with MCI won't see the more specific network announcement from MCI.

The problem shows up when you see routes from Sprintlink.  A few
Canadian network connect through Sprint/Canada as well as fONOROLA.
The more specific networks from 198.53 are announced by Sprintlink.
Since the no-export suppressed the more specific announcement to
MCI BGP peers, the traffic for those Canadian sites follows the
more specific network announcement and heads for Sprint.

I understand the BGP mechanics are working as specified, so it
isn't "broken" per se. But I'm just wondering if Canadian sites
really expect traffic to go via Stockton, California?

I haven't been able to reach anyone at fONOROLA/Istar.  I was just
wondering if any other North American network operators had heard
what was supposed to happen last month when fONOROLA made these
Sean Donelan, Data Research Associates, Inc, St. Louis, MO
  Affiliation given for identification not representation

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