From: Peter van Oene (pvo@usermail.com)
Date: Thu Apr 29 2004 - 12:42:53 GMT-3
At 11:00 AM 4/29/2004, Richard Dumoulin wrote:
>I think you are looking too much into this particular case. I was only
>admiring the astuteness of some people. Anything bad with this ?
Could be ;-) However, I still think the question is invalid, and wouldn't
use the answers provided.. The type 7/5 hack is marginally
cleaner. Swapping RIDs is nasty.
>-----Original Message-----
>From: Peter van Oene [mailto:pvo@usermail.com]
>Sent: jueves, 29 de abril de 2004 16:18
>To: ccielab@groupstudy.com
>Subject: RE: Another burning question on BGP
>
>
>At 03:31 AM 4/29/2004, Richard Dumoulin wrote:
> >Richard, this is what the employers expect from their engineers, being
> >able to find solutions even if the question is absurd. I believe it is
> >also required in the exam. Well done and thank you for making me learn
> >something today,
>
>What did you learn?
>
>Maybe it was how to hose up your network by changing RID values that likely
>causes way more harm than good. While I don't disagree that this might fix
>this one problem, it is a waste of time to try and figure out. If you had
>RIDs and loopback addresses mixed up in my network, we'd be sitting down
>chatting about reference letters and your need to prep your resume.
>
>I don't disagree that learning how to figure out things, and using
>technology creatively is a good thing. Who is going to argue with
>that. What I disagree with is spending time learning how to manipulate
>routers to suit test scenarios that don't relate to appropriate uses of
>technology (real world or otherwise) Spending time figuring out how
>protocols work when you set them up to do things that they weren't designed
>to do has very limited rewards. I personally think that the reason these
>situations exist stems from some proctors desire to make the test hard,
>instead of making it judge valuable skills.
>
>
>
> >--Richard
> >
> >-----Original Message-----
> >From: Edwards, Andrew M [mailto:andrew.m.edwards@boeing.com]
> >Sent: jueves, 29 de abril de 2004 1:05
> >To: Richard Davidson; Peter van Oene; ccielab@groupstudy.com
> >Subject: RE: Another burning question on BGP
> >
> >
> >Nonetheless, I'm glas I asked and thanks for the response Richard.
> >
> >andy
> >
> >-----Original Message-----
> >From: Richard Davidson [mailto:rich@myhomemail.net]
> >Sent: Wednesday, April 28, 2004 1:02 PM
> >To: Peter van Oene; ccielab@groupstudy.com
> >Subject: Re: Another burning question on BGP
> >
> >
> >I agree with Peter. However, if my memory serves me
> >this is what to do.
> >
> >At the ASBR (R1) you are redistributing the BGP routes
> >into ospf and they are comming from the ASBR ospf
> >Router ID R1. Those routes get to R3 and they are
> >from ,,, you guessed it R1. Well stop there and
> >switch to BGP.
> >
> >R1 & R3 both peers with R2 which is a RR. When the
> >BGP route gets to R3 it is from R2 "not R1". Sync
> >will fail.
> >Solution: swap BGP router IDs with R2 and R1. Now R1
> >sends a BGP route as if he is R2. R2 gets it and it
> >sends it as if it is R1 to R3. When R3 sees the BGP
> >route is from the R1 BGP Router ID and the OSPF route
> >is from the R1 ospf Router ID it will sync.
> >
> >---------------------
> >{R1}---{R2}----{R3} |
> > |
> > AS1 |
> >---------------------
> >--- Peter van Oene <pvo@usermail.com> wrote:
> > > The short answer is that this is an @#$@'ing
> > > ridiculous scenario that is a
> > > complete waste of your time. If Cisco wants to test
> > > on it, then shame on
> > > them for forcing you to study such a moronic topic.
> > > There is nothing
> > > anywhere near a practical requirement for such a
> > > topology and
> > > synchronization is years more outdated than many of
> > > the already deprecated
> > > items that have found space on the CCIE lab.
> > >
> > >
> > >
> > > At 12:39 PM 4/28/2004, Edwards, Andrew M wrote:
> > > >I'm trying to understand methods to keep
> > > synchronization on in BGP and
> > > >provide BGP to OSPF redistribution with route
> > > reflectors.
> > > >
> > > >You know the problem where the route reflector
> > > server receives an update
> > > >from a route reflector client that is
> > > redistributing BGP to OSPF.
> > > >
> > > >When the route reflector server gets the update, it
> > > reflects that update
> > > >to all other RR clients but changes the BGP ID to
> > > itself.
> > > >
> > > >Obviously the other BGP RR clients get the BGP
> > > update but the OSPF
> > > >router ID and BGP ID do not match on the clients so
> > > the BGP route is not
> > > >marked
> > > >As a best path ">"
> > > >
> > > >So the question I have is what methods are
> > > available to make this work
> > > >with synchronization on and using route reflectors?
> > > >
> > > >Is the answer go to full mesh or transfer to
> > > confederations?
> > > >
> > > >I'm stumped on how to change the BGP router-id to
> > > the originators BGP
> > > >router ID on the RR server.
> > > >
> > > >Thanks for the input... or clearing up my
> > > confusion.
> > > >
> > > >Andy
> > > >
> > >
> > >_____________________________________________________________________
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> >
> >=====
> >Richard Davidson
> >Yahoo IM: r1davidson
> >e-mail rich@myhomemail.net
> >
> >_______________________________________________________________________
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