Re: Ospf Point-to-point to multipoint

Maybe I'm missing something, but wouldn't the following work:

R1
int ser0/0
enc fram
no fram inv

interface Serial0/0.124 multipoint
 ip address 172.16.124.1 255.255.255.0
 ip ospf network point-to-multipoint
 frame-relay interface-dlci 102
 frame-relay interface-dlci 105
end

R1(config-router)#do sh ip ospf nei | i 124
172.16.124.5 0 FULL/ - 00:01:59 172.16.124.5
 Serial0/0.124
172.16.124.2 0 FULL/ - 00:01:50 172.16.124.2
 Serial0/0.124

R2 &R5
int ser0/0
enc frame rel
no fram inv

interface Serial0/0/0.124 point-to-point
 ip address 172.16.124.5 255.255.255.0
 ip ospf network point-to-multipoint
 frame-relay interface-dlci 501
end

R5(config-if)#do sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface
172.16.124.1 0 FULL/ - 00:01:39 172.16.124.1
 Serial0/0/0.124

R5(config-router)#do sh ip route os
     172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
O 172.16.124.1/32 [110/64] via 172.16.124.1, 00:00:59, Serial0/0/0.124
O 172.16.124.2/32 [110/128] via 172.16.124.1, 00:00:59,
Serial0/0/0.124

On Fri, Mar 8, 2013 at 12:50 PM, Brian Dennis <bdennis_at_ine.com> wrote:

> Could you just use PPPoFR?
>
> In your current configuration if you enter a "show ip route <remote
> spoke's FR
> INT IP>" from a spoke and it points directly to the interface and not the
> hub,
> then you'll need some sort of L3 to L2 mapping to reach the remote spoke.
> If
> you used OSPF Point-to-Multipoint on the spokes the route to reach the
> other
> spoke (/32 host route) would be via the hub as opposed to the directly
> connected interface as it is with the OSPF Point-to-Point network type.
> This
> is the reason you need a "mapping" on the spoke to reach the other spoke.
>
> Technically speaking OSPF Point-to-Multipoint is making the L3 topology in
> sync with the L2 topology by routing the spoke to spoke communication
> through
> the hub. OSPF Point-to-Multipoint is a "proper" solution by putting the L3
> topology in sync with the L2 topology as opposed to a "hack" solution of
> PPPoFR or mapping the spoke's L3 address to the L2 address of the hub.
>
> --
> Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
> bdennis_at_ine.com<mailto:bdennis_at_ine.com>
>
> INE, Inc.
> http://www.INE.com<http://www.ine.com/>
>
> From: Daniel Barney Briseqo
> <daniel.barney.b_at_hotmail.com<mailto:daniel.barney.b_at_hotmail.com>>
> Date: Friday, March 8, 2013 11:29 AM
> To: Brian Dennis <bdennis_at_ine.com<mailto:bdennis_at_ine.com>>
> Cc: Cisco certification
> <ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>>
> Subject: Re: Ospf Point-to-point to multipoint
>
> The lab I am doing is asking for that:
> - No frame relay maps between the spokes.
> - Spokes should be point to point using the physical interface, so i change
> the network type with ip ospf network and i set the timers to be equal
> with
> ip ospf hello-timers
> -hub must be multipoint.
>
> Ping with the hub works fine. From spoke to spoke, it is.
>
> Daniel Barney Briseqo
> "El zltimo minuto tambiin tiene 60 segundos"
> daniel.barney.b_at_hotmail.com<mailto:daniel.barney.b_at_hotmail.com>
>
>
>
> On Mar 7, 2013, at 7:23 PM, Brian Dennis wrote:
>
> I'm assuming that your spokes are also multipoint (physical Frame Relay or
> multipoint subinterface) since you mentioned the spokes are not allowed
> the communicated directly. Is there a reason you don't have the spokes
> set to point-to-multipoint? Point-to-multipoint is designed to allow for
> reachability between the spokes without the need for mappings between
> spokes in the event the spokes are multipoint interfaces.
>
> --
> Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
> bdennis_at_ine.com<mailto:bdennis_at_ine.com>
>
> INE, Inc.
> http://www.INE.com
>
>
>
>
> On 3/7/13 4:53 PM, "Daniel Barney Briseqo"
> <daniel.barney.b_at_hotmail.com<mailto:daniel.barney.b_at_hotmail.com>>
> wrote:
>
> Hello there.
> In this topology, over frame relay:
>
> R1-----------R2
> |
> |
> R3
>
> -I only have frame relay maps from, R1 to R2 and from R1 to R3.
> -Frame relay between the spokes is not allowed
> -The spokes must be ospf network type point-to-point and the hub
> multipoint.
> -I have changed the hello timers, so neighbors are UP.
>
> I have connectivity from hub to both spokes, but I dont have from spoke to
> spoke.
> Is this a split horizon issue?
>
> Rutes are being propagated well, I have announced the loopbacks on ospf
> and I
> can see all of them on each router.
>
> Daniel Barney Briseqo
> "El zltimo minuto tambiin tiene 60 segundos"
> daniel.barney.b_at_hotmail.com<mailto:daniel.barney.b_at_hotmail.com>
>
>
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-- 
Sunil Modi
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616-889-6441
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