From: Joel Amao (femmy79@hotmail.com)
Date: Wed Dec 12 2007 - 20:00:43 ART
You only communicate with the the DR/BDR on NBMA, so assuming you set
priority to 0 then it can neither be a DR nor a BDR. So the neighbor command
is taken out since we dont need a full neighbor relationship with a non
DR/BDR.
Thanks,
Joel Amao
CCIE#18128
> Date: Thu, 13 Dec 2007 07:53:27 +1000> From: acewer64@gmail.com> To:
shiranp3@gmail.com> Subject: Re: OSPF Neighbour config wont stick in config ?>
CC: goglidze@gmail.com; ktokash@hotmail.com; ccielab@groupstudy.com> > 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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