From: Todd Carswell (acarswell@xxxxxxxxx)
Date: Thu Feb 14 2002 - 15:04:00 GMT-3
Your description of the process sounds correct to me. That description is a
"10,000 foot view" of redistribution.
The tricky part of redistribution is two-fold:
1. You have to make sure that the metrics from one protocol are distributed
properly into another. (i.e. hop-count in RIP translated into the OSPF
metric.)
2. If you're redistributing from a classFUL protocol into a classLESS
protocol (RIP to OSPF), you have to deal with classful networks not being
visible in the classless domain.
Somebody please beat me about the head and shoulders if I've got it wrong or
if I've omitted something. :-)
Todd Carswell
----- Original Message -----
From: "Xu, James" <james.xu@eds.com>
To: <ccielab@groupstudy.com>
Sent: Thursday, February 14, 2002 11:57 AM
Subject: How route redistribution EXACTLY works --- need confirmation
> All:
>
> It has been and still puzzling me how a routing process pick routes and
> redistribute them into another routing process and vice versa? As an
> example, mutual redistribution between RIP and OSPF in a router:
>
> Here is my experience and explanation:
>
> 1). The RIP process picks all RIP routes inside its database, and
> redistributes these routes into OSPF routing process.
> 2). OSPF process picks all OSPF routes in the OSPF database, and
> redistributes these routes into RIP routing process.
>
> During the redistribution, the split-horizon rule appies, meaning the
newly
> redistributed routes from RIP into OSPF will not be redistributed back
into
> RIP right away, and vice versa.
>
> Any input are appreciated, especially some links for this mechnism.
>
> James
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