From: Night War (nightwar@gmail.com)
Date: Sun Dec 24 2006 - 20:10:54 ART
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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