Re: Ospf Point-to-point to multipoint

Daniel - I'd say your biggest problem here is not the end result (ie: pings not working), but that you are not troubleshooting it correctly, which is a much more important issue.
There have been various mails explaining different options to you (PPPoFR, manual frame map statements, or point to multipoint behaviour for next-hop etc....).
At this point I would advise looking at different debug options you could use, and trying to find the root cause this way.
I'd start by looking at the routing table, checking the next hop for the routes you are having issues with. Debug ip packet while attempting pings might show you valuable information (eg: encapsulation failed etc). Debug ip icmp / packet on target router to verify if return path is possibly the issue - things like this. (Traceroute etc)

Just my 2c.
Hope this helps.

Rgds,
Peter

Sent from my iPhone

On 8 Mar 2013, at 22:49, Daniel Barney BriseC1o <daniel.barney.b_at_hotmail.com> wrote:

> Brian,
> If you know how to make it work with the restrictions I have, please let me know. At first I thought it was a split horizon issue, but since ospf uses database I am not quite sure about this.
>
> And I have routes of the spoke on the other spoke.
>
> Saludos Cordiales,
> Daniel Barney BriseC1o
> Sent from my iPhone
>
> On Mar 8, 2013, at 4:18 PM, "Brian Dennis" <bdennis_at_ine.com> wrote:
>
>> It appears that he has restrictions with using point-to-multipoint on the
>> spokes and is using physical interfaces on them also.
>>
>> I have to ask. Why are you disabling inverse-ARP on the physical interface
>> when you don't have an IP address assigned to the physical interface?
>>
>> --
>> 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: Sunil Modi <sunil.s.modi_at_gmail.com<mailto:sunil.s.modi_at_gmail.com>>
>> Date: Friday, March 8, 2013 5:07 PM
>> To: Brian Dennis <bdennis_at_ine.com<mailto:bdennis_at_ine.com>>
>> Cc: Daniel Barney Briseqo
>> <daniel.barney.b_at_hotmail.com<mailto:daniel.barney.b_at_hotmail.com>>, Cisco
>> certification <ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>>
>> Subject: 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<http://172.16.0.0/16> is variably subnetted, 3 subnets, 2
>> masks
>> O 172.16.124.1/32<http://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<http://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<mailto: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><mailto:bdennis_at_ine.com<mailto:bdennis
>> @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><mailto:danie
>> l.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><mailto:bdennis_at_ine.com<mailto:bdenni
>> s_at_ine.com>>>
>> Cc: Cisco certification
>> <ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com><mailto:ccielab_at_groupst
>> udy.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><mailto: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><mailto:bdennis_at_ine.com<mailto:bdennis
>> @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><mailto:danie
>> l.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><mailto:daniel
>> .barney.b_at_hotmail.com<mailto:daniel.barney.b_at_hotmail.com>>
>>
>>
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>>
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>>
>>
>>
>>
>>
>>
>> --
>> Sunil Modi
>> sunil.s.modi_at_gmail.com<mailto:sunil.s.modi_at_gmail.com>
>> 616-889-6441<tel:616-889-6441>
>>
>>
>> Blogs and organic groups at http://www.ccie.net
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Received on Sat Mar 09 2013 - 10:12:49 ART