From: Danny Cox (dandermanuk@gmail.com)
Date: Mon Mar 05 2007 - 07:59:41 ART
Thanks guys for the replies .. I was really trying to find whether anyone
had any experience of P2P on one end, P2MP on the other causing problems,
once the timers have been adjusted. I think I'm in reasonable shape on the
things to check for which type to use, but this suggestion that a P2P/P2MP
pair might have problems puzzles me. Other than the timers, I can't see why
it would have. Any ideas?
I appreciate the feedback though and will make sure that I'm good with what
you highlight.
cheers
Danny
On 05/03/07, Elias Chari <elias.chari@gmail.com> wrote:
>
> Danny,
>
> Don't make any assumptions about the lab. Learn the ospf network types
> inside out and practice them all.
>
> Ask yourself the following questions:
> 1. Which are compatible network types?
> 2. Which of them require a DR election?
> 3. Which ones modify the next hop?
> 4. Which ones use multicast vs unicast hellos?
> 5. What if the are restrictions on the configuration of the frame-relay
> network. Do you know how to select the correct ospf network type to ensure
> full reachability?
>
> It is more likely than not that you will have specific
> directions/restrictions which will lead to a certain network type. Picking
> the correct network type should be second nature by the time you get to the
> lab.
>
> --
> Regards,
> Elias
> CCIE#17354
>
>
> On 3/4/07, Darby Weaver <darbyweaver@yahoo.com > wrote:
> >
> > Just remember a few things - OSPF Network Types should
> > be compatible.
> >
> > ie. P2P and P2M are compatible
> > Br and NBMA are compatible
> >
> > Remember which ones have DR elections and which ones
> > do not.
> >
> > Use of priority to influence this is common - an
> > interface with "ip ospf priority 0" will never try to
> > win the election and become DR. One with 255 will
> > always win (unless you do it on two - but why?).
> >
> > Hmmm...
> >
> > You can set the ip ospf network type but do not always
> > need to - what if you are told you cannot do this -
> > remember they will likely take something away before
> > they ever give it...
> >
> > Keep these things in mind...
> >
> > Always ask yourself:
> >
> > Is it a P2P interface?
> >
> > Is it a Multipoint (or logical subinterface)
> > interface?
> >
> > Is is a Brodcast interface?
> >
> > Off the top...
> >
> >
> > --- Danny Cox <dandermanuk@gmail.com > wrote:
> >
> > > hi folks
> > > typically in my labs, when I've been building a
> > > hub&spoke setup,
> > > I've configured the hub to me a point-to-mutilpoint
> > > ospf network type,
> > > left the spokes as point to point, and tweaked the
> > > hello/dead timers
> > > to make sure it works.
> > >
> > > It was suggested to me recently that this was a
> > > bad idea and that
> > > there have been problems, unspecified, with this
> > > setup. I've yet to
> > > see anything to confirm this. Assuming the lab
> > > doesn't insist upon
> > > using one or the other, I'd be inclined to do what
> > > I've said. Anyone
> > > got reasons why I shouldn't?
> > >
> > > cheers
> > > Danny
> > >
> > >
> > _______________________________________________________________________
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> > >
> >
> >
> > ================================================
> > = Darby Weaver =
> > ================================================
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> > = =
> > ================================================
> > =**********************************************=
> > ================================================
> > = Location: Central Florida, USA =
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> > ================================================
> >
> > _______________________________________________________________________
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