Re: Tricky BGP into IGP Question

[Danny McPherson <danny () ambernetworks com>]

I this 'trick' you're looking for is that of disabling BGP 
synchronization (i.e., 'no synchronization' in IOS parlance).  

Putting external things in your IGP is a really BAD idea, 
BTW.

-danny

> What is the preferred way to get transit customers routing information into
> your IGP so that BGP will announce the route to it's neighbors.  
>
> 1===2a===2b====3
>     |
>     4
>
> 1 is the customer, announcing to 2a, who propogates 1's route to 2b and to
> 4.  2b will not announce the route to 3 as it doesn't have a route in it's
> routing table for 1's route.  I was thinking about redistributing bgp into
> my igp using a route-map based on as-path filter, but that seems somewhat
> kludgy.  What are you all doing to accomplish this or am I just missing
> something here?