From: Xu, James (james.xu@xxxxxxx)
Date: Fri Feb 15 2002 - 13:05:06 GMT-3
Mike:
I like the condition you added, which is "routes eligible for the RIB". I
think, you mean another routing source, which has lower adminstrative
distance, didn't inject the same route into routing table.
For ospf, when you say the routing bit set, do you mean the routes resulted
from SPF, and also in the RIB? In other words, any route which does not
exist in the routing table will not be redistributed?
Thanks for the input
james
-----Original Message-----
From: Michael Davis [mailto:miked@netrus.net]
Sent: Thursday, February 14, 2002 5:21 PM
To: Xu, James; 'Lab Candidate'; ccielab@groupstudy.com
Subject: Re: How route redistribution EXACTLY works --- need
confirmation
Hi James,
>From my experience, I agree with you.
The RIP redistributes _valid_ routes from it's database. That is, routes
learned via other rip speakers, other routing processes via redistribution,
connected networks covered in network statements, etc, that the RIP process
has not discarded and are eligible for the RIB. When you apply route-maps,
you control which of these routes are redistributed.
The same goes for OSPF. LSAs for all the area's links and routers reside in
the database, but not all database entries are in fact redistributed. RIP
wouldn't know how to handle them since it doesn't do SPF. Only those with
the routing bit set (processed by SPF and eligible for the RIB) are
available for redistribution.
Mike
----- Original Message -----
From: "Xu, James" <james.xu@eds.com>
To: "'Lab Candidate'" <labccie@yahoo.com>; <ccielab@groupstudy.com>
Sent: Thursday, February 14, 2002 2:13 PM
Subject: RE: How route redistribution EXACTLY works --- need confirmation
> I would like add a little more to explain why I believe the RIP is not
> picking up routes from routing table:
>
> Suppose there is a connected route in the router, which is configured to
be
> under RIP process. In the routing table, this route will be showed as
> "connected". But the RIP still is redistributing this route out anyway.
As
> a fact, this route shows up on your rip database too.
>
> James
>
> -----Original Message-----
> From: Lab Candidate [mailto:labccie@yahoo.com]
> Sent: Thursday, February 14, 2002 1:48 PM
> 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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