ATOMIC AGGREGATE (section 9.1.4 of bgp 4-17)

[Babu Prabesh <[e-mail]>]

Section 9.1.4: overlapping routes states:

"If a BGP speaker chooses to aggregate, then it MUST add
ATOMIC_AGGREGATE attribute
to the route. A route that carries ATOMIC_AGGREGATE attribute can not be
de-aggregated.
That is, the NLRI of this route can not be made more specific.
Forwarding along such a
route does not guarantee that IP packets will actually traverse only ASs
listed in the
AS_PATH attribute of the route".

I was unsure of what de-aggregation means.
Consider an example

               bgp                  bgp
  RTRA---------RTRB----------RTRC

 RTRA sends 5/8 with ATOMIC_AGGREGATE set to RTRB.
 RTRB has a 5/16 route (via static).

Is the draft indicating that RTRB should only
advertise 5/8 to RTRC and not advertise 5/16.

Thanks
 Babu

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