From: shiran guez (shiranp3@gmail.com)
Date: Thu Dec 13 2007 - 04:09:07 ART
A neighbour statement should be on the hub as the Hub is the connector
between the spokes and not the other way around if a spoke go down none of
the other spokes will be effected but if the Hub go down all the spokes will
loose communication so the logic is that due to the fact that the Hub is
keeping all the spokes together the Hub should be the place where you
initiate connection to the spokes and you do that by putting the neighbour
statement under the Hub ospf process.
Think of the Job that DR and BDR have, they are listening to there Neighbour
LSA and updating the Area about the Database to be sync so if you say under
the process to unicast a neighbor it mean that you want to update him with
LSA, but you also say that you are not the DR/BDR and never will be then you
actually can jeopardise the concept of DR/BDR as if you try to neighbor with
another non DR/BDR you will start exchanging LSA on NBMA when it is the Job
of the DR to update you.
I hope it is not a total mess but try to think of the DR/BDR job prospective
and you realize that it is Bad Design to put the neighbour on the spoke.
On Dec 12, 2007 11:53 PM, Alan Ewer <acewer64@gmail.com> wrote:
> Hi guys..
> Yes I disagree that its not required.. A neighbour command must be
> configured somewhere, why not on the spokes ? Maybe a hole in my
> understanding of OSPF NBMA but it shouldnt matter where the neighbour
> command is as long as someone statrs the adjacency negotiation... all is
> good ....correct ??
>
> Regds
> Alan E
> Brisbane Australia
>
>
> On Dec 13, 2007 6:07 AM, shiran guez <shiranp3@gmail.com> wrote:
>
> > nice :-)
> >
> >
> >
> >
> > On Dec 12, 2007 10:03 PM, George Goglidze <goglidze@gmail.com> wrote:
> >
> > > Hi Shiran,
> > >
> > > That is what happens until you restart your router!!! :)))
> > >
> > > try restart it with priority 0, and you'll see that after it comes up,
> > >
> > > even if you change your priority the neighbor statement is not there
> > > any more...
> > >
> > > Regards,
> > >
> > >
> > >
> > > On Dec 12, 2007 8:45 PM, shiran guez <shiranp3@gmail.com> wrote:
> > >
> > > > George
> > > >
> > > > try to set it up with the ip ospf prio 0 and the neigbor statement
> > > > under the ospf process and then only remove the ip ospf prio 0, you will see
> > > > that your neighbor statement is reappearing so it indicate that it is only
> > > > hidden and not removed.
> > > >
> > > >
> > > >
> > > >
> > > > On Dec 12, 2007 6:15 PM, George Goglidze <goglidze@gmail.com> wrote:
> > > >
> > > > > Hi there,
> > > > >
> > > > > It's not hidden, it's simply removed as it's not needed.
> > > > >
> > > > > when you have NBMA network and you set priority 0 on non-hub
> > > > > routers.
> > > > > the neighbor command is removed on next reload.
> > > > >
> > > > > I'm not sure, but I think this could be security against
> > > > > misconfiguration,
> > > > > so that you don't configure non-hub -to- non-hub neighbor.
> > > > >
> > > > > in NBMA mode you just configure neighbor on DR and BDR.
> > > > >
> > > > > that's the only neighborship you need anyway.
> > > > >
> > > > > Regards,
> > > > >
> > > > > On Dec 12, 2007 4:21 PM, shiran guez <shiranp3@gmail.com> wrote:
> > > > >
> > > > > > the command is hidden not gone, i do not think it is a bug but
> > > > > > as I said
> > > > > > before a issue of cosmetics.
> > > > > >
> > > > > > On Dec 12, 2007 4:40 PM, keith tokash < ktokash@hotmail.com >
> > > > > > wrote:
> > > > > >
> > > > > > > Can you test if the command is hidden or simply gone? Easy
> > > > > > way to do this
> > > > > > > is to remove the neighbor command from the hub and see if the
> > > > > > neighbors come
> > > > > > > up.
> > > > > > >
> > > > > > > If there's a valid reason for this I want to know. If it's a
> > > > > > bug, we may
> > > > > > > hit it in the lab, and I also want to know. :)
> > > > > > >
> > > > > > > With a few exceptions, secrecy is deeply incompatible with
> > > > > > democracy and
> > > > > > > with science.
> > > > > > > --Carl Sagan
> > > > > > >
> > > > > > > > Date: Wed, 12 Dec 2007 14:03:56 +0200
> > > > > > > > From: shiranp3@gmail.com
> > > > > > > > To: acewer64@gmail.com
> > > > > > > > Subject: Re: OSPF Neighbour config wont stick in config ?
> > > > > > > > CC: ccielab@groupstudy.com
> > > > > > >
> > > > > > > >
> > > > > > > > well I would say that logically it doesn't make sense to put
> > > > > > there in
> > > > > > > the
> > > > > > > > first place so the developers probably made it to be hidden
> > > > > > when you put
> > > > > > > the
> > > > > > > > interface into prio 0
> > > > > > > >
> > > > > > > > if you will remove the ip os prio 0 you will see again your
> > > > > > neighbor
> > > > > > > > statement so it was not remove simply hidden to hint you
> > > > > > that it is not
> > > > > > > > needed, so it is just cosmetics.
> > > > > > > >
> > > > > > > > On Dec 12, 2007 1:01 PM, Alan Ewer < acewer64@gmail.com>
> > > > > > wrote:
> > > > > > > >
> > > > > > > > > Hi Shiren,
> > > > > > > > > yes i understand that the neighbour command can be on
> > > > > > either location
> > > > > > > (
> > > > > > > > > but doesnt need to be on both)..
> > > > > > > > >
> > > > > > > > > My Question is
> > > > > > > > > Why does setting ip ospf pri 0 .. remove the neighbour
> > > > > > command from
> > > > > > > the
> > > > > > > > > ospf process configuration ??
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > Regds
> > > > > > > > > Alan E
> > > > > > > > >
> > > > > > > > > On Dec 12, 2007 8:53 PM, shiran guez < shiranp3@gmail.com>
> > > > > > wrote:
> > > > > > > > >
> > > > > > > > > > you do not need a neighbor statement on the spoke of the
> > > > > > hub. only
> > > > > > > on
> > > > > > > > > > the hub.
> > > > > > > > > >
> > > > > > > > > > if you set ip ospf prio 0 this router will never become
> > > > > > a DR or BDR
> > > > > > > so
> > > > > > > > > > no need to indicate where to unicast
> > > > > > > > > >
> > > > > > > > > > On Dec 12, 2007 12:38 PM, Alan Ewer < acewer64@gmail.com
> > > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > > Hi All
> > > > > > > > > > > I have been pondering this little brain teaser ??
> > > > > > > > > > >
> > > > > > > > > > > If I have a router configured with the following
> > > > > > > > > > >
> > > > > > > > > > > router ospf 1
> > > > > > > > > > > router id 1.1.1.1
> > > > > > > > > > > network 1.1.1.0 0.0.0.255 AREA 0
> > > > > > > > > > > neighbour 1.1.1.2
> > > > > > > > > > >
> > > > > > > > > > > ok so far right !!
> > > > > > > > > > >
> > > > > > > > > > > Int ser 0/0
> > > > > > > > > > > ip address 1.1.1.1 255.255.255.0
> > > > > > > > > > > frame map bla bla bla
> > > > > > > > > > > ip ospf prio 0
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > and bingo the neighbour command disappears from the
> > > > > > OSPF router
> > > > > > > config
> > > > > > > > > > > ...
> > > > > > > > > > > Anyone know why ???
> > > > > > > > > > >
> > > > > > > > > > > Regds
> > > > > > > > > > > Alan E
> > > > > > > > > > > Brisbane, Aust
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > >
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> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > Shiran Guez
> > > > > > > > > > MCSE CCNP NCE1
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> > > > > > > > --
> > > > > > > > Shiran Guez
> > > > > > > > MCSE CCNP NCE1
> > > > > > > > http://cciep3.blogspot.com
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> > > > Shiran Guez
> > > > MCSE CCNP NCE1
> > > > http://cciep3.blogspot.com
> > > > http://www.linkedin.com/in/cciep3
> > > >
> > >
> > >
> >
> >
> > --
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> > Shiran Guez
> > MCSE CCNP NCE1
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> >
>
>
-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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