Re: OSPF Adj in case of different subnet masks of neighbours

From: Fahad Khan (fahad.khan@gmail.com)
Date: Sun Oct 26 2008 - 18:37:29 ARST

hmmm.....well network type is same on both ends that is "broadcast", i set
it under interface mode. the only different thing is subnet mask. but i
wonder to see why its prompting as "Mismatched hello parameters"...

On 10/27/08, Jason Madsen <madsen.jason@gmail.com> wrote:
>
> Fahad,
>
> You can mix OSPF types, but NOT if one type requires a DR (broadcast,
> non-broadcast) with a type that doesn't use a DR (p2p, p2m, and p2m
> non-broadcast)...it won't work. If mixing compatible types just remember to
> consider timers...they must match.
>
> Jason
>
> On Sun, Oct 26, 2008 at 2:24 PM, Fahad Khan <fahad.khan@gmail.com> wrote:
>
>> Dear All,
>>
>> Have a look to the scenario,
>>
>>
>> R1(s1/0-10.0.0.1/*16*)------------------(10.0.0.2/*8*-s1/0)R2<http://10.0.0.2/*8*-s1/0%29R2>
>>
>> *OSPF adj forms* in case if i set the network type "point-to-point" on
>> both
>> serial interfaces
>>
>> But if I set network type as "Broadcast", *adj is not formed*
>>
>> and the "debug ip ospf adj+events+packets" looks like (on R1);
>>
>> *Mar 1 00:08:58.783: OSPF: Send with youngest Key 0
>> *Mar 1 00:08:58.783: OSPF: Send hello to 224.0.0.5 area 0 on Serial1/0
>> from
>> 10.
>> 0.0.1
>> *Mar 1 00:09:06.431: OSPF: rcv. v:2 t:1 l:44 rid:2.2.2.2
>> aid:0.0.0.0 chk:0 aut:2 keyid:0 seq:0x3C7EC691 from Serial1/0
>> *Mar 1 00:09:06.435: OSPF: Rcv hello from 2.2.2.2 area 0 from Serial1/0
>> 10.0.0.
>> 2
>> *Mar 1 00:09:06.439: OSPF: Mismatched hello parameters from 10.0.0.2
>> *Mar 1 00:09:06.443: OSPF: Dead R 40 C 40, Hello R 10 C 10 Mask R
>> 255.0.0.0 C
>> 255.255.0.0
>>
>> Can any body shed light on the reason behind all this?
>> Thanks in advance
>>
>> best regards,
>> --
>> Fahad Khan
>>
>>
>> Blogs and organic groups at http://www.ccie.net
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> 

-- 
Fahad Khan

Blogs and organic groups at http://www.ccie.net

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