Re: Ospf Point-to-point to multipoint

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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