Use frame-relay map statements on B and C pointing to each other but using
the same DLCI as set to router A. If you want the router to bind
multicasts/broadcast addresses to the DLCI circuit don't forget the
'broadcast' keyword (a common mistake) otherwise OSPF will not be able to
encapsulate and send it's hello packets preventing adjacency.
You can use inverse arp ('frame-relay interface-dlci x') for the connections
to A (inverse-arp is inherently point to point). However, you must use
'frame-relay map' statements for the connections from B to C and C to B.
Mixing inverse-arp and manual map statements is ok as long as you completely
understand the issues involved.
A
102 | 103
/ \
201 / X \ 301
B --/-----\-- C
Router B
Interface s0
Ip address 1.1.1.2 255.255.255.248
Frame-relay interface-dlci 201
Frame-relay map ip 1.1.1.3 201 broadcast
Router C
Interface s0
Ip address 1.1.1.3 255.255.255.248
Frame-relay interface-dlci 301
Frame-relay map ip 1.1.1.2 301 broadcast
Router A
Interface s0
Ip address 1.1.1.1 255.255.255.248
Frame-relay interface-dlci 102
Frame-relay interface-dlci 103
WAYNE BAETY, MCSE, A1C, USAF
Network Systems Trainer
P.S. Don't laugh at my graphic ;)
> -----Original Message-----
> From: EA Louie [mailto:[EMAIL PROTECTED]]
> Sent: Friday, January 11, 2002 4:12 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Frame relay map 0.0.0.0 question, please help! CCIE lab is
> [7:31575]
>
> > Did you change the Hub router's ospf priority so It will become DR? And
> > change The spoke routers' ospf priority to 0 so it will never attempt to
> > become DR or bdr?
> >
>
> And also, if you have NOT issued the command clear frame inarp (12.1 and
> above) or clear frame-inarp (12.0 and below), the map statements will
> remain
> until you reload the routers. That will need to be done on router B and
> router C. Routers B and C do not form adjacencies with each other in this
> topology *unless* you make use of the full mesh, which you've been
> instructed *not* to do. They both form adjacencies with Router A. That's
> why you add a map statement to each Router B and Router C to point them to
> each other via their respective DLCI's to Router A, unless you're
> explicitly
> told not to do that. (Which is whole different can of worms)
>
> My strategy is shut off inverse arp, clear frame inarp, get the map
> statements into the config, write the config, and reload.
>
> You may wish to reschedule your Feb lab date if you're at this point with
> OSPF and frame relay a month or so away from your lab. It only gets more
> complex than this, and this concept, while not elementary, is 'core' to
> your
> success in the lab exam.
>
> > -----Original Message-----
> > From: Wilson, Christian [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, January 10, 2002 12:23 PM
> > To: [EMAIL PROTECTED]
> > Subject: Frame relay map 0.0.0.0 question, please help! CCIE lab is Feb
> > [7:31555]
> >
> >
> > I have a frame switch configured for full mesh connectivity over a 3
> node
> > frame relay cloud. Router A and router B cannot use subinterfaces.
> Router
> > B and router C can only use thier dlci that connects them to Router A,
> not
> > the dlci that connects them to each other. Because the frame switch is
> set
> > up as a full mesh, I have disabled inverse arp on router A, B, and C and
> > have used frame relay map commands with the broadcast parameter on each
> > router. I am able to ping every router just fine using router A as a
> hub.
> > Then I need to enable ospf between all of them. I used the neighbor
> x.x.x.x
> > command to enable ospf, but the two spoke routers, B and C, only form
> adj
> > with router A, they can not form adj with each other. When I debug ip
> ospf
> > adj, I see that routers B and C are sending their poll-intervals? to
> > 0.0.0.0. When I issued a sh frame relay map command, I saw the
> following
> > entires:
> >
> > sh fram map
> > Serial0/0 (up): ip 0.0.0.0 dlci 503(0x1F7,0x7C70)
> > broadcast,
> > CISCO, status defined, inactive
> > Serial0/0 (up): ip 0.0.0.0 dlci 502(0x1F6,0x7C60)
> > broadcast,
> > CISCO, status defined, inactive
> > Serial0/0 (up): ip 140.4.1.2 dlci 503(0x1F7,0x7C70), static,
> > broadcast,
> > CISCO, status defined, inactive
> > Serial0/0 (up): ip 140.4.1.3 dlci 503(0x1F7,0x7C70), static,
> > broadcast,
> > CISCO, status defined, inactive
> >
> > I can not seem to loose the frame maps to 0.0.0.0. They do not show
> > themselves as being learned dynamically or statically. What do they
> mean?
> > How do I get rid of them? How did they get in there? I can not form
> adj,
> > please help!!
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