RE: How route redistribution EXACTLY works --- need confirmation

From: Xu, James (james.xu@xxxxxxx)
Date: Fri Feb 15 2002 - 13:12:38 GMT-3

   
Chua:

Each router has an internal routing database for each routing protocol, for
rip, the command "sh ip rip data" will show you. (only available after
12.1).

Every route learned from different source will be in the database. But only
routes eligible in the RIB will be redistributed, like Michael Davis just
pointed out from his response.

James

-----Original Message-----
From: Chua, Parry [mailto:Parry.Chua@compaq.com]
Sent: Thursday, February 14, 2002 7:55 PM
To: Lab Candidate; Xu, James; ccielab@groupstudy.com
Subject: RE: How route redistribution EXACTLY works --- need
confirmation

I guess James is refer to routes that learn from arouting protocol but
not in routing table
because of AD value( eg debug rip get 10 routes, 7 route in routing
table and redistriute rip to another routing protocol, now 10 routes or
7 routes get redistributed to other protocol) ?

Perhaps once can think about it and test it out...

Parry Chua

-----Original Message-----
From: Lab Candidate [mailto:labccie@yahoo.com]
Sent: Friday, February 15, 2002 2:48 AM
To: Xu, James; ccielab@groupstudy.com
Subject: Re: How route redistribution EXACTLY works --- need
confirmation

James,

I don't think there's such a thing as RIP route database.
The RIP process will pick up routes directly from the
routing table, whereas ospf picks from its database. 

---

--- "Xu, James" <james.xu@eds.com> wrote:
> 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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