From: Ronnie Angello (ronnie.angello@gmail.com)
Date: Sun Jun 03 2007 - 19:15:41 ART
Non-broadcast and point-to-point are not compatible network types.
Adjacencies may form when you change the timers but routes will not be
exchanged properly. Only non-broadcast and broadcast support DR election.
Since it says you can't use neighbor statements, broadcast is your only
option.
On 6/3/07, Jason Guy (jguy) <jguy@cisco.com> wrote:
>
> Hi everyone. I have been digging into OSPF a little today while working
> on a practice lab.
>
> The requirement asks to set up OSPF over the frame relay hub and spoke.
> Frame relay is running on the main serial interfaces. It says not to
> use neighbor statements under OSPF, and ensure the hub is always the DR.
>
> The default is ospf interface type is NON-BROADCAST, which does not
> allow the hellos to multicast. So I thought I can set the spokes to
> POINT-TO-POINT, and leave the HUB NON-BROADCAST but set the hello and
> dead timers to 10 and 30 respectively.
>
> This did bring the neighbors up and it does ensure the hub is the DR
> since the spokes cannot be DR. However the solution sets all routers to
> BROADCAST, and sets the ip ospf priority to 0 on the spokes OSPF
> interface to ensure the hub is DR. I am sure this is a valid solution
> as well.
>
> So, I did some searching on the achieve and surprisingly could not find
> much on this. So my question is this:
>
> Which method would be correct?
>
> In the real lab, is it fair to change the ospf timers, especially when a
> later requirement requires OSPF fast hellos set up?
>
> The reason I ask is I understand the exam is graded with a script. Is
> there multiple "correct" answers coded in it? Or did I miss a subtle
> clue that should have pointed me to using BROADCAST all around rather
> than a mix of network types?
>
> Thanks in advance,
> Jason
>
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-- Ronald Angello CCIE #17846
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