Clarification : BGP Aggregation

From: Thekkethala (thek@xxxxxxxxxxxx)
Date: Mon Nov 12 2001 - 22:30:45 GMT-3


   
This is with respect to the configuration on Page 351-353 of Halabi's book
regarding Aggregation with a subset of more specific routes.

Not clear on how the objective is being reached ??

The question ?

1. RTR A is using a suppress map for 172.16.220.0 and therefore not
advertising out to any peer.

So how does Router F get to know abt this subnet ?? (even though RTR F config
has a network staement for 172.16.220.0 ... it is not relevant is it cause it
does not originate form there ??)

2. Therefore how can Router F advertise this out via its EBGP when its NOT
EVEN present in its BGP table on account of Router A's suppress map on for
this subnet ???

Am I missing something basic ?????/

thanks ....still wondering hhhhmmm !!

Ajit



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