From: alsontra@hotmail.com
Date: Sun Jul 04 2004 - 20:36:25 GMT-3
Yes, this is what I was asking. I would have thought that protocols
redistributed information from their individual topology databases. The idea
that redistributed information comes from the RIB is very new to me.
However, it clearly explains why single device indirect redistribution is
not possible.
Just to be sure that I'm clear, the RIB takes the best (lowest admin
distance, longest match, etc) routes from all protocols and it is from this
information or database that mutual redistribution occurs. ??? Simply put,
the RIB's singular selection of "most preferable" routes can cause the lose
of less preferable protocol information.
As I understand it, the solution to this problem is to mutual redistribute
all protocols. ??? Correct?
Thanks Howard,
Alsontra
----- Original Message -----
From: "Howard C. Berkowitz" <hcb@gettcomm.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, July 04, 2004 1:39 PM
Subject: Re: Indirect redistribution
> At 1:33 PM -0700 7/4/04, <alsontra@hotmail.com> wrote:
> >All,
> >
> >I'm looking for examples of indirect protocol redistribution. For
example:
> >Protocol A is redistributed into protocol B and protocol B is
redistributed
> >into protocol C. My understanding of this situation is that its not
possible
> >to indirectly redistribute protocols on a single device. I've searched
the
> >CCO and came up empty, hopefully someone has further information on this
> >scenario.
> >
>
> Remember that redistribution is not really between the internal
> databases of routing processes. It's from the main RIB (i.e., that
> which you see from show IP route) into the routing process with the
> redistribute statement. Redistribute actually goes through the RIB
> and pulls out the installed routes from the source defined in the
> redistribute command.
>
> Since only one route (ignoring load balancing) to a destination can
> get installed in the routing table, if the route installed came from
> protocol A, when protocol B tries to redistribute it, protocol B
> might be more preferable (e.g., lower AD), and protocol B will
> replace the protocol A route.
>
> In such a situation, protocol C will never see the protocol A route,
> only the protocol B. Is that what you are asking?
>
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