From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Sun Jul 04 2004 - 17:39:54 GMT-3
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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