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RE: How route redistribution EXACTLY works --- need confirmation posted 02/14/2002
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I've just realised how limiting my last statement was :-)

Yes it would, but I think that's how it deals with the connected issue that
James mentioned.  I'm beginning to question myself now ?

-----Original Message-----
From: Lab Candidate [mailto:labccie@xxxxxxxxx]
Sent: 14 February 2002 19:51
To: RPF; Xu, James; ccielab@xxxxxxxxxxxxxx
Subject: RE: How route redistribution EXACTLY works --- need
confirmation


Ross,

Will rip redist into ospf any routes learnt from its neighbors
but not covered by its own network commands?

--- RPF <rpf@xxxxxxxxxxxxxxxx> wrote:
> My view, (and probably wrong)
>
> If you redistribute from RIP into another, then it will redistribute what
> you have in your RT, providing it is covered by a RIP network command, so
if
> you have a connected route in your table that is not covered by the
network
> statement then it will not be redistributed, you will have to perform
> redistribute connected ?
>
> any takers ?
>
> Ross.
> -----Original Message-----
> From: Xu, James [mailto:james.xu@xxxxxxx]
> Sent: 14 February 2002 19:28
> To: 'RPF'; ccielab@xxxxxxxxxxxxxx
> Subject: RE: How route redistribution EXACTLY works --- need
> confirmation
>
>
> Ross:
>
> Trust me, you will not be able to answer this question by reading through
> Doyle. I have been reading through it a couple of times.
>
> As far as your last comment, a CCIE may not be able to answer this
question
> clearly. If you think it is easy, give a try!
>
> Like what I said, I am puting myself in beating position. :-)
>
> James
> -----Original Message-----
> From: RPF [mailto:rpf@xxxxxxxxxxxxxxxx]
> Sent: Thursday, February 14, 2002 2:09 PM
> To: Xu, James; ccielab@xxxxxxxxxxxxxx
> 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@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf Of
> Xu, James
> Sent: 14 February 2002 18:44
> To: 'Todd Carswell'; ccielab@xxxxxxxxxxxxxx
> 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@xxxxxxxxx]
> Sent: Thursday, February 14, 2002 1:04 PM
> To: Xu, James; ccielab@xxxxxxxxxxxxxx
> 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@xxxxxxx>
> To: <ccielab@xxxxxxxxxxxxxx>
> 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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> > Please discuss commercial lab solutions on this list.
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