Brian,
I would like to see if you, or anyone on the list can assist me in getting
this config to work correctly.
Lab:
I have 3 routers (2501's) 1 frame switch, ~hub and spoke topology backbone.
2 other routers (2501's) for my virtual-link. The backbone is configured
with NBMA, and off of each backside is an (ethernet) broadcast area labeled
1, 2, and 3. Off of r5's ethernet is area 2. I have connected r3's ethernet
to this segment, and the serial side of r3 is another area -area 4. I have
setup the ethernet interface on the r3 a virtual link to r5 through that
(ethernet segment) broadcast area. The problem is that r5 doesn't get
routing information for area 4. All the other routers do receive routing
information for area 4 through the virtual-link, and area 4 receives routing
info for everything else. There seems to be a problem with the virtual-link
setup.
_______r5---area 2---r3---area 4
/
area 1---r6------frameswitch
\_______r4---area 3
Now after reading over my message it looks like I need to include some
configs. I'll get to the lab and copy some configs. I'll just throw this out
there and see if anyone can see any mistakes that stick out.
>>>Brian
>From: "Brian Dennis" <[EMAIL PROTECTED]>
>Reply-To: "Brian Dennis" <[EMAIL PROTECTED]>
>To: "Brian Lodwick" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
>Subject: RE: DR Election
>Date: Wed, 31 Jan 2001 13:13:11 -0800
>
>Brian,
>An OSPF virtual link is treated as an IP unnumbered point-to-point link.
>There isn't a DR or BDR on an OSPF point-to-point link.
>
>Brian Dennis
>CCIE #2210 (R&S)(ISP/Dial)
>CCSI #98640
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>Brian Lodwick
>Sent: Wednesday, January 31, 2001 12:40 PM
>To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
>Subject: RE: DR Election
>
>
>What about this configuration I can't get this to work right?
>NBMA backbone area w/virtual-link punching through a broadcast area to the
>backbone. Does the router off of the virtual link create an adjacency with
>the DR/BDR on the backbone?
>
> >>>Brian
>
>
> >From: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
> >Reply-To: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: RE: DR Election
> >Date: Wed, 31 Jan 2001 15:00:13 -0500
> >
> > >What about Virtual-links too, aren't they considered a traffic type?
> >
> >
> >I might be getting in trouble here answering off the top of my head,
> >but IIRC they are treated as point-to-point links terminating in the
> >router ID at each end.
> >
> > >
> > >>>>Brian
> > >
> > >
> > >>From: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
> > >>Reply-To: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
> > >>To: [EMAIL PROTECTED]
> > >>Subject: RE: DR Election
> > >>Date: Wed, 31 Jan 2001 12:19:07 -0500
> > >>
> > >>>There are three main types on environments (I hope)
> > >>
> > >>Correct, but also let me add:
> > >>
> > >> Demand circuit
> > >>
> > >>
> > >>>
> > >>>Broadcast
> > >>>Point-to-Point
> > >>>NBMA (Non-Broadcast Multi-Access)
> > >>>
> > >>>Point to Point would not be a multi-access segment. The other two
> >would. An
> > >>>Example of Broadcast is Ethernet, while an example of NBMA would be
> > >>>Frame-Relay. Following this logic ' DR and BDR concepts ' would not
> >have to
> > >>>be broadcast, only multi-access. Point to point creates an adjacency
> >instead
> > >>>of using DR's and BDR's.
> > >>>
> > >>>I hope the diagram below turns out, but the first one is point to
> >point, so
> > >>>information is exchanged directly, however in a multi-access
> >environment
> > >>>both other routers only exchange information with the DR so as not to
> >have
> > >>>to have an adjacency with every single router.
> > >>>
> > >>>X-------X
> > >>>
> > >>> ----O
> > >>>X-|
> > >>> ----O
> > >>>
> > >>>If OSPF worked that way and you had 10 routers connected via
>Ethernet,
> >each
> > >>>would each have to exchange information with the other 9. That would
> >create
> > >>>45 adjacency's. Way to much traffic would have to exchanged. With
>those
> >same
> > >>>10 Routers using OSPF DR and BDR concepts, you could have 1 Router
>with
> >10
> > >>>"Adjacency's" total. Much less routing traffic. I hope I haven't
> >muddled
> > >>>things to much.
> > >>>
> > >>>Joey
> > >>>
> > >>>-----Original Message-----
> > >>>From: pinoal [mailto:[EMAIL PROTECTED]]
> > >>>Sent: Wednesday, January 31, 2001 2:58 AM
> > >>>To: [EMAIL PROTECTED]
> > >>>Subject: DR Election
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>Hi ,
> > >>>
> > >>>From the OSPF Design Guide - Sam Halabi
> > >>>
> > >>>' DR and BDR concepts are per multiaccess segment '
> > >>>
> > >>>My question is what type of segments are considered as "multiaccess
> > >>>segment" ?
> > >>>
> > >>>Ethernet , FR with Point-to-Multipoint with broadcast option enabled
>,
> >any
> > >>>others??????????
> > >>>
> > >>>What does he mean by 'per multiaccess segment ' ?
> > >>>
> > >>>thanks
> > >>>
> > >>>
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