From: Ivan (ivan@iip.net)
Date: Sun Dec 24 2006 - 20:34:23 ART
Once R2 have DR state - then it have NBMA or broadcast network type. NBMA and
p2m is not compatible types. They will setup adjacencies such as all timers
similar (and other adjacencies conditions) but routes have not exchange.
On Monday 25 December 2006 02:10, Night War wrote:
> Hello Group !!
>
> Happy holidays to all members in GS !! Happy Christmas and advance New Year
> wishes to all !!
>
> I've a simple configuration shown in the topology below :
>
> loopback0 s1/0 s1/0
> loopback 0 150.1.1.1------------------- R1 -------------()------------ R2
> ---------------------150.1.2.2
> area 1 .1 155.1.0.0 .2 area 2
> area 0
> (hub) (spoke)
>
>
> I'm having a problem and I would be glad if someone could explain to me the
> cause of the problem and why this problem is happening at the first place.
>
> I've configured and implemented OSPF based on the configuration below for
> R1 and R2:
>
> R1 OSPF Config and Serial 1/0 config:
>
> router ospf 100
> router-id 150.1.1.1
> network 150.1.0.0 0.0.255.255 area 1
> network 155.1.0.1 0.0.0.0 area 0
>
> interface Serial1/0
> ip address 155.1.0.1 255.255.255.0
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> ip ospf hello-interval 10
> ip ospf priority 255
> frame-relay map ip 155.1.0.2 102 broadcast
> no frame-relay inverse-arp
> end
>
>
> R2 OSPF and Serial1/0 config:
>
> router ospf 100
> router-id 150.1.2.2
> network 150.1.0.0 0.0.255.255 area 2
> network 155.1.0.2 0.0.0.0 area 0
>
> interface Serial1/0
> ip address 155.1.0.2 255.255.255.0
> encapsulation frame-relay
> ip ospf hello-interval 10
> ip ospf priority 0
> frame-relay map ip 155.1.0.1 301 broadcast
> no frame-relay inverse-arp
> end
>
>
> I've purposely not give any network type on the interface of Serial 1/0 of
> router 2 (R2) the spoke. I've given the network type of point-to-multipoint
> in the Hub router of the frame-relay cloud as I might add more routers to
> the frame-relay cloud.
>
> The hello-interval and dead-interval of both R1 and R2 are the same on both
> routers namely 10 secs and 30 secs respectively.
>
> On using the configuration mentioned above for R2 and R1 I'm able to form
> adjacency and both R1 and R2 have established neighbor relationship. The sh
> ip ospf neighbor command on both the routers are below:
>
> R1#sh ip ospf neighbor
>
> Neighbor ID Pri State Dead Time Address Interface
> 150.1.2.2 0 FULL/ - 00:00:34 155.1.0.2
> Serial1/0
>
>
> R2#sh ip ospf neighbor
>
> Neighbor ID Pri State Dead Time Address Interface
> 150.1.1.1 255 FULL/DR 00:00:35 155.1.0.1
> Serial1/0
>
>
>
> Now having said all that I've done and showing you my outputs I'm having
> the following problem. Both the routers R1 and R2 are not able to learn
> each others loopback interface which they are advertising into the ospf
> domain. R1 is advertising 150.1.1.1 as area 1 and R2 is advertising
> 150.1.2.2 as area 2. Both the routers R1 and R2 are ABR's as they have
> atleast one interface in area 0.
>
> Both the routers are not learning any routes from their neighbor even if I
> add another loopback network into area 0.
>
> the solution to the above problem is to add "ip ospf network
> point-to-point" on serial 1/0 of the spoke router R2. everything goes well
> after applying this command. both routers are learning all the routes. I
> would like to know the reason why these routers don't learn the routes
> prior to applying the "ip ospf network point-to-point" on serial 1/0 of R2.
> What is the logic for such a behavior ?
>
> Thanks
> Fahad.
>
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-- Ivan
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