From: steven.j.nelson@xxxxxx
Date: Thu Feb 14 2002 - 17:16:01 GMT-3
Ross
Not strictly true, I work with 5 ccie's and a number of other guys who are
"ccie quality" and out of the 5 maybe 2 have read doyle...However they all
use CCO ALOT!!
I would agree it's an execllent reference for IGP's but no substitute for
working on large networks.
Ta
Steve
-----Original Message-----
From: RPF [mailto:rpf@multilayer.co.uk]
Sent: 14 February 2002 19:09
To: Xu, James; ccielab
Subject: RE: How route redistribution EXACTLY works --- need
confirmation
James,
In my opinion, it would probably be beneficial to read Doyle, Vol I from
Cisco press, as the amount of info you need to know I don't think can be
summarized in a few sentences.
If you want CCIE, you need to read it anyhow. :-)
Ross.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Xu, James
Sent: 14 February 2002 18:44
To: 'Todd Carswell'; ccielab@groupstudy.com
Subject: RE: How route redistribution EXACTLY works --- need
confirmation
Todd:
You are right, I am looking for answers about the "core mechanism" of the
redistribution process. The points you presented are well valid.
Here I am puting up a stroke man to let everyone to punch on, hopefully on
the way, we all can get complete understanding. I, personally, didnot find
much public documentaion to explain this.
Some points I am going after are :
1). does the routing process pick routes out of routing database or out of
routing table to do the redistribution? I am a believer of the former. But I
would like some input on this, documentation even better.
2). does, in fact, the split-horizon rule applies here. It is my experience
let me believe so. Further confirmation needed.
3). if possible if someone can post the algorithm related to the
redistribution.
Just a little more for chewing.
James
-----Original Message-----
From: Todd Carswell [mailto:acarswell@nc.rr.com]
Sent: Thursday, February 14, 2002 1:04 PM
To: Xu, James; ccielab@groupstudy.com
Subject: Re: How route redistribution EXACTLY works --- need
confirmation
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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