BGP Not Sending Routes to Neighbor

From: Anthony Sequeira (terry.francona@gmail.com)
Date: Thu Nov 24 2005 - 13:40:35 GMT-3

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Hi Group!

I want to create a troubleshooting list for a problem that I see often when
I am doing practice labs - AND THE REAL THING.

You build your BGP topology by creating your peerings - and then you notice
that a router is not sending BGP routes to another BGP peer as you would
expect. By the way - you can verify this with the excellent BGP
troubleshooting/verification command SHOW IP BGP NEIGH
X.X.X.XADVERTISED-ROUTES.

Here is the list so far:

1. iBGP Split Horizon Rule - updates from iBGP are not passed to another
iBGP router - fixed with Route Reflection or Confederation
2. Filtering/Suppression - duh! - you are filtering the routes from being
advertised through one of the many filter options in BGP - or perhaps you
are doing aggregation
3.
4.

Thanks for your help!

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