North American Network Operators Group
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Re: Canadian routes with BGP no-export communities

  • From: Alan Hannan
  • Date: Thu Jun 06 23:39:25 1996 
  Sounds to me like Policy Based Routing is starting to evolve in a
  particularly interesting way.

  -alan

.........  Sean Donelan is rumored to have said:
] 
] Does anyone know what's going on in Canada?
] 
] In the last couple of weeks fONOROLA/iStar.net changed how they
] announce aggregated networks.  Now fONOROLA is sending some more
] specific network announcements for multi-homed networks in 198.53.0.0
] 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
] changes.
] --
] Sean Donelan, Data Research Associates, Inc, St. Louis, MO
]   Affiliation given for identification not representation
] 
] 
] 

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