From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Tue Apr 08 2003 - 14:13:25 GMT-3
Matthew
The highest router ID only works when the router that you want to be DR
comes up and negotiates with other routers BEFORE a DR and BDR are elected.
If you want something to work all of the time, set all non-DR routers to an
OSPF priority of 0 and then the desired router will become DR with a
priority of 1.
-----Original Message-----
From: Matthew Poole [mailto:matthew.poole@blueyonder.co.uk]
Sent: Tuesday, April 08, 2003 12:57 PM
To: OhioHondo; ccie_studying; Brian Dennis; 'Scot Peter';
ccielab@groupstudy.com
Subject: Re: A question on OSPF for NBMA Networks
Agreed, although another method is to fix the router ID's so that the
highest router ID is on the hub.
This is discussed in Parkhursts OSPF command and config handbook (P406)-
Using this method there is no need to set OSPF priority.
Does anybody know any situations where this wouldn't be valid.
----- Original Message -----
From: "OhioHondo" <ohiohondo@columbus.rr.com>
To: "ccie_studying" <ccie_studying@hotmail.com>; "Brian Dennis"
<brian@labforge.com>; "'Scot Peter'" <scotsman@rediffmail.com>;
<ccielab@groupstudy.com>
Sent: Tuesday, April 08, 2003 4:12 PM
Subject: RE: A question on OSPF for NBMA Networks
> You do not have to set the priority on the desired DR to 255. If you set
the
> priority of all other routers to 0, this will suffice. The desired DR will
> then have the default priority of 1 -- and it will get selected.
>
> I suggest using the "ip ospf priority" command on the interfaces of the
> routers to set each routers priority.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> ccie_studying
> Sent: Tuesday, April 08, 2003 9:50 AM
> To: Brian Dennis; 'Scot Peter'; ccielab@groupstudy.com
> Subject: Re: A question on OSPF for NBMA Networks
>
>
> A question regarding DR selection :-).
>
> I learned that if you want one router be hundred percent sure as DR, you
can
> configure this router as "priority 255" and configure other routers
> "priority 0".
>
> Scenario: FR cloud, neighbour command only:
>
> But when I check router configuration, in the one with "priority 0",
> "neighbour xxxxx" command doesn't show up in running configuration at all.
> Is this normal?
>
> And just to confirm, do you need two neighbour statement in DR-other
router
> (spoke) pointing to both hub and other spoke?
>
> Thanks!
>
> ----- Original Message -----
> From: "Brian Dennis" <brian@labforge.com>
> To: "'Scot Peter'" <scotsman@rediffmail.com>; <ccielab@groupstudy.com>
> Sent: Thursday, March 06, 2003 2:32 PM
> Subject: RE: A question on OSPF for NBMA Networks
>
>
> > Well putting my CCIE lab thinking cap on ;-) the task states "don't
> > configure network type broadcast or non-broadcast" but the default will
> > be non-broadcast since we are using physical interfaces and multipoint
> > subinterfaces. Here are my preferred solutions in order of preference.
> >
> > 1) All interfaces point-to-multipoint. Note: Creates /32 host routes for
> > the end points but doesn't need frame-relay mappings between the spokes.
> >
> >
> > 2) Point-to-multipoint on R1 and point-to-point on R2 and R3. The
> > hello/dead timers need to be set on R1 or R2/R3 to match. Note: Creates
> > /32 host route for only R1 so frame-relay mappings would be needed
> > between the spokes.
> >
> > 3) Unicast neighbors on R1 and set the OSPF priority to "0" on R2 and
> > R3. But first I would clarify with the proctor the wording of the "don't
> > configure" part of the task and ensure "don't configure network type
> > non-broadcast" doesn't also mean "don't use non-broadcast network type"
> > (you've got to love the CCIE lab ;-) If the wording means "don't
> > configure network type non-broadcast" then this solution is okay but if
> > the wording means "don't use network type non-broadcast" then I would
> > scrap this solution. Note: Frame-relay mappings would be needed between
> > the spokes.
> >
> > Brian Dennis, CCIE #2210 (R&S/ISP Dial/Security)
> > brian@labforge.com
> > http://www.labforge.com
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Scot Peter
> > Sent: Thursday, March 06, 2003 8:39 AM
> > To: ccielab@groupstudy.com
> > Subject: A question on OSPF for NBMA Networks
> >
> > Hi Group,
> >
> > If we need to configure OSPF on a Multipoint interface with the
> > following condition,
> > - R1 should use Multipoint interfaces,
> > - R2, R3 should not use subinterfaces,
> > - All three routers should be in the same Network.
> > - Don't configure Network type Broadcast or non-broadcast.
> >
> > R1
> > / \
> > R2 R3
> >
> > I am not sure about configuring "ip ospf network
> > point-to-multipoint" (as it is mentioned not to configure
> > non-broadcast) or do we need to configure using "neighbor"
> > command? Please advice me on this.
> >
> > Thanks
> > Peter
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