Re: OSPF problem..pls help.

Good catch. I didn't even notice. :) Check your configuration on both
sides. It appears you have a mismatch of area type.

router ospf 1
 log-adjacency-changes
 network 1.1.4.4 0.0.0.0 area 0 <====== does this match on the other side.

Keep in mind the ospf hello packet has an area-id field and if this does not
match on both sides then the adjacency will not be formed.

Below is an example of packet structure I found searching google:

http://routemyworld.com/wp-content/uploads/2008/07/ospf-packet-header.jpg

Also here is some reading on why neighbors might not form:

http://supportwiki.cisco.com/ViewWiki/index.php/OSPF_routers_do_not_form_neighbor_relationship_due_to_a_mismatch_in_hello_parameters

Steve Lyons

On Sun, Sep 13, 2009 at 8:56 AM, Divin Mathew John <divinjohn_at_gmail.com>wrote:

> *Sep 13 11:20:38.243: OSPF: Rcv pkt from 1.1.24.2, Serial0/0/0, area
> 0.0.0.0
> mismatch area 0.0.0.2 in the header??
>
>
> On Sun, Sep 13, 2009 at 6:19 PM, Steve Lyons <charter21p5_at_gmail.com>wrote:
>
>> Ping 224.0.0.5 and source it from the ptp interface. Let me know if you
>> get
>> a response.
>>
>> Steve Lyons
>>
>> On Sun, Sep 13, 2009 at 6:16 AM, Naufal Jamal <naufalccie_at_yahoo.in>
>> wrote:
>>
>> > Hi,
>> >
>> > I have a full-mesh of ospf network but having problems between R4 and R2
>> > point-to-point network type .here is the config/debug on both the
>> > routers.the
>> > neighbourship never comes up.
>> >
>> >
>> > R4
>> >
>> > interface Serial0/1/0
>> > ip address 1.1.24.4 255.255.255.0
>> > encapsulation frame-relay
>> > ip ospf network point-to-point
>> > frame-relay map ip 1.1.24.4 402
>> > frame-relay map ip 1.1.24.2 402 broadcast
>> > no frame-relay inverse-arp
>> > end
>> >
>> > R4
>> >
>> > (config-if)#do debug ip ospf ev
>> > OSPF events debugging is on
>> > R4(config-if)#
>> > *Sep 13 11:20:38.131: OSPF: Send hello to 224.0.0.5 area 2 on
>> Serial0/1/0
>> > from
>> > 1
>> > .1.24.4
>> > *Sep 13 11:20:38.243: OSPF: Rcv pkt from 1.1.24.2, Serial0/0/0, area
>> > 0.0.0.0
>> > mismatch area 0.0.0.2 in the header
>> >
>> > sh ip ospf ne
>> > Neighbor ID Pri State Dead Time Address
>> Interface
>> > 1.1.3.3 1 FULL/DROTHER 00:01:51 1.1.100.3
>> > Serial0/0/0
>> > 1.1.6.6 1 FULL/BDR 00:01:47 1.1.100.6
>> > Serial0/0/0
>> >
>> > router ospf 1
>> > log-adjacency-changes
>> > network 1.1.4.4 0.0.0.0 area 0
>> > network 1.1.24.4 0.0.0.0 area 2
>> > network 1.1.100.4 0.0.0.0 area 0
>> > neighbor 1.1.100.3
>> > neighbor 1.1.100.6
>> >
>> > R2
>> >
>> >
>> > R2(config-if)#
>> > *Mar 1 16:50:33.663: OSPF: Send hello to 224.0.0.5 area 2 on
>> > FastEthernet0/0
>> > fr
>> > om 1.1.26.2
>> > *Mar 1 16:50:34.491: OSPF: Rcv hello from 1.1.4.4 area 2 from Serial0/0
>> > 1.1.24.
>> > 4
>> > *Mar 1 16:50:34.491: OSPF: Send immediate hello to nbr 1.1.4.4, src
>> > address
>> > 1.1
>> > .24.4, on Serial0/0
>> > *Mar 1 16:50:34.495: OSPF: Send hello to 224.0.0.5 area 2 on Serial0/0
>> > from
>> > 1.1
>> > .24.2
>> > *Mar 1 16:50:34.495: OSPF: End o
>> > *Mar 1 16:58:55.403: OSPF: Rcv hello from 1.1.6.6 area 2 from
>> > FastEthernet0/0
>> > 1
>> > .1.26.6
>> > *Mar 1 16:58:55.403: OSPF: End of hello processing
>> > R2(config-if)#
>> > R2(config-if)#do
>> > *Mar 1 16:58:58.567: OSPF: Send hello to 224.0.0.5 area 2 on Serial0/0
>> > from
>> > 1.1
>> > .24.2
>> > R2(config-if)#do u all
>> > All possible debugging has been turned off
>> > R2(config-if)#do sh ip ospf ne
>> > Neighbor ID Pri State Dead Time Address
>> Interface
>> > 1.1.4.4 0 INIT/ - 00:00:32 1.1.24.4
>> Serial0/0
>> > 1.1.6.6 1 FULL/BDR 00:00:33 1.1.26.6
>> > FastEthernet0/0
>> >
>> > interface Serial0/0
>> > ip address 1.1.24.2 255.255.255.0
>> > encapsulation frame-relay
>> > ip ospf network point-to-point
>> > frame-relay map ip 1.1.24.2 204
>> > frame-relay map ip 1.1.24.4 204 broadcast
>> > no frame-relay inverse-arp
>> > frame-relay lmi-type cisco
>> > end
>> >
>> > router ospf 1
>> > log-adjacency-changes
>> > network 1.1.2.2 0.0.0.0 area 2
>> > network 1.1.24.2 0.0.0.0 area 2
>> > network 1.1.26.2 0.0.0.0 area 2
>> >
>> > neighborship with R3 and R6 is o.k dont understand why it is not comin
>> up
>> > between R2 and R4 p2p link...
>> >
>> > Thanks,
>> > Naufal
>> >
>> >
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Received on Sun Sep 13 2009 - 09:11:46 ART