From: Jason Guy \(jguy\) (jguy@cisco.com)
Date: Mon Jun 04 2007 - 10:11:17 ART
Thanks everyone. It makes complete sense now. I think I need more book
time.
Jason
________________________________
From: Ronnie Angello [mailto:ronnie.angello@gmail.com]
Sent: Sunday, June 03, 2007 6:16 PM
To: Jason Guy (jguy)
Cc: ccielab@groupstudy.com
Subject: Re: OSPF network types
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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