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

From: Fahad Khan (fahad.khan@gmail.com)
Date: Sun Oct 26 2008 - 18:44:59 ARST

hmmm....well.. thanks for the prompt response jason...Any one if has some
more comments on it, please share...

Thanks,

On 10/27/08, Jason Madsen <madsen.jason@gmail.com> wrote:
>
> sorry, I didn't catch the part that you had different subnet masks...yes,
> they must match UNLESS you are using P2P or virtual link.
>
> Jason
>
> On Sun, Oct 26, 2008 at 2:37 PM, Fahad Khan <fahad.khan@gmail.com> wrote:
>
>> 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
>
>
> 

-- 
Fahad Khan

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

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