From: Matthew Poole (matthew.poole@blueyonder.co.uk)
Date: Tue Apr 08 2003 - 13:56:55 GMT-3
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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