From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Wed Feb 01 2006 - 18:08:16 GMT-3
No, nothing was supposed to happen on the hub in that instance.
What Brian and TJ correctly point out (and where my post was in haste and
hence incorrect) is that with ip ospf priority 0 on the spokes, you can't
configure neighbor statements on the spokes and therefore need to configure
them on the hub.
Without the ip ospf prior 0 on the spokes, you can have the neighbor
statements on the spokes and everything should work fine as long as the
router-ID makes the hub the DR.
Chris
On 2/1/06, Larry Roberts <groupstudy@american-hero.com> wrote:
>
> OK, I decided to play along at home. The spokes lost their neighbor
> statements, but nothing happened ( that I can tell ) on the hub. Was
> something *supposed* to happen on the hub?
>
>
>
>
> Brian McGahan wrote:
> > Try configuring the neighbor statement on *just* the spokes and see what
> > happens. Look at the OSPF configuration of the hub and spokes. What,
> > if anything, has changed?
> >
> > Brian McGahan, CCIE #8593
> > bmcgahan@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987 x 705
> > Outside US: 775-826-4344 x 705
> > 24/7 Support: http://forum.internetworkexpert.com
> > Live Chat: http://www.internetworkexpert.com/chat/
> >
> >> -----Original Message-----
> >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of
> >> Gustavo Novais
> >> Sent: Wednesday, February 01, 2006 10:24 AM
> >> To: Popgeorgiev Nikolay
> >> Cc: ccielab@groupstudy.com
> >> Subject: RE: ospf misunderstanding
> >>
> >> Hi,
> >> In fact this is a bit of mislead between theory and practice.
> >> If you try it out, you'll see that just configuring neighbors on hub
> >> will work.
> >> Regarding the ip priority 0, as I was remembered by GS some time ago,
> > it
> >> is not a requisite for this type of topology. Things will work if you
> >> don't set it to 0. But probably they will not work the way you wish
> > to.
> >> Regarding of how will the spokes know where is the HUB (DR), if you
> >> remember you configured neighbor x.x.x.x (which by default configures
> >> this remote neighbor with priority 0) on the hub.
> >>
> >> So, what will happen is that each hub will send unicast hellos and
> > DBD's
> >> (because of neighbor command) coming from a router (HUB). There is
> > your
> >> answer. They will engage in DR/BDR election, on the moment that spoke
> >> receives that DBD, and reply to its source. If you configured spoke
> >> with lower priority than hub, spoke will become BDR (or non-dr).
> >>
> >> Hence in practice you do not need to configure neighbor on spoke
> >> routers.
> >>
> >> My 0.02$
> >>
> >> Gustavo Novais
> >>
> >> -----Original Message-----
> >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of
> >> Popgeorgiev Nikolay
> >> Sent: quarta-feira, 1 de Fevereiro de 2006 15:50
> >> To: ccielab@groupstudy.com
> >> Subject: ospf misunderstanding
> >>
> >> Dear all,
> >>
> >> I have a small question about ospf, network types and frame-relay.
> >>
> >> Here is a sample network:
> >>
> >> two spokes, one hub. The requirement is to enable ospf between them
> > and
> >> to use non-broadcast network type on the interfaces.
> >>
> >> This leads to a DR/BDR election, and according to me the DR should be
> > on
> >> the hub and there shouldn't be BDR.
> >> Also I have to put "ip ospf priority 0" on my spoke routers'
> > interfaces
> >> right?
> >> Cause the network doesn't allow multicasts I have to specify neighbors
> > -
> >> two from the DR and one on each spoke.
> >> BUT in a solution from a work book I saw this sentence :
> >>
> >> "The neighbor statements are required only on interfaces that are NOT
> >> configured with ip ospf priority 0 (which means spokes don't need
> >> neighbor command)"
> >>
> >> SO how does the spokes find where to make their adjacency ?
> >>
> >>
> >> thanks,
> >> Nick
> >>
> >>
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