Re: OSPF and Priorities

From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Mon Sep 08 2008 - 05:51:30 ART

The command reference seems to explains this:

http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_osp2.html#wp1013124

neighbor x.x.x.x cost n

"(Optional) Assigns a cost to the neighbor, in the form of an integer
from 1 to 65535. Neighbors with no specific cost configured will assume
the cost of the interface, based on the ip ospf cost command. For
point-to-multipoint interfaces, the cost keyword and the number argument
are the only options that are applicable. This keyword does not apply to
nonbroadcast multiaccess (NBMA) networks. "

Paul.

Alan Ewer wrote:
> Ahhh that would explain it...
> thort i was goin mad ..
> cheers lads
> regds
> Alan E
> brisbane
>
>
>
> On 9/8/08, Jonathan Greenwood II <gwood83@gmail.com> wrote:
>> Ahh good one Andy everyday we learn something. I thought the same as
>> well.
>>
>> R/
>>
>> Jonathan
>>
>>
>> On Sun, Sep 7, 2008 at 7:59 PM, andy <andy@cloud9.net> wrote:
>>
>>> I did a little looking and it seems that:
>>>
>>> From "CiscoR OSPF Command and Configuration Handbook (CCIE Professional
>>> Development)"
>>>
>>> Neighbor ospf priority lowest wins (section 11-5)
>>>
>>> Interface ospf priority highest wins (section 19-8)
>>>
>>> This was news to me. I always thought highest won.
>>>
>>> Andy
>>>
>>> -----Original Message-----
>>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>>> Jonathan Greenwood II
>>> Sent: Sunday, September 07, 2008 9:56 PM
>>> To: Alan Ewer
>>> Cc: Cisco certification
>>> Subject: Re: OSPF and Priorities
>>>
>>> How is it that i cannot get this command to set the DR
>>> (ie the priority) from a neighbour.. ?
>>>
>>>
>>> Hmm I just labbed it up. When I initially clear the proccess on R1 it
>>> shows
>>> the priority information being exchanged
>>>
>>> Neighbor ID Pri State Dead Time Address
>>> Interface
>>> N/A 100 ATTEMPT/DROTHER 00:01:53 1.1.1.2
>>> FastEthernet00
>>>
>>> But once the state is has established it shows as Priority 1
>>>
>>> Neighbor ID Pri State Dead Time Address
>>> Interface
>>> 150.20.2.2 1 FULL/DR 00:01:59 1.1.1.2
>>> FastEthernet00
>>>
>>> Good question though I have to play with it a little more or read
>>> something
>>> about it more. I agree with you on: R2's default priority of 1 should be
>>> over-ruled by the "suggested priority
>>> of 100
>>>
>>> Jonathan
>>>
>>>
>>>
>>>
>>> On Sun, Sep 7, 2008 at 6:17 PM, Alan Ewer <acewer64@gmail.com> wrote:
>>>
>>>> Hi All this is a bit of a picky question...here goes..
>>>> OSPF will use the DR with the highest priority right..
>>>> this can be set on an interface using the "ip ospf priority 100" command
>>>> ...all good...no problem
>>>>
>>>> however the command neighbor 1.2.3.4 priority 100 is to set a
>>> neighbours
>>>> priority to 100 (if it has a lesser priority set..)
>>>> The neighbor assesses the priority in the incoming hello and the
>>> configured
>>>> and the highest priority wins ...Am I right so far..
>>>>
>>>> How is it that i cannot get this command to set the DR
>>>> (ie the priority) from a neighbour.. ?
>>>>
>>>> Ie if R1 and R2 are configured as NBMA.
>>>> R1 is 1.1.1.1 and R2 is 1.1.1.2
>>>>
>>>> I want R2 to be the DR but am not permitted to set a priority. I should
>>> be
>>>> able to set R1 up as follows:
>>>> ==================
>>>> router ospf 1
>>>> nei 1.1.1.2 priority 100
>>>> ====================
>>>> R2's default priority of 1 should be over-ruled by the "suggested
>>> priority
>>>> of 100
>>>>
>>>> What am I missing here ??
>>>>
>>>> Regds
>>>> Alan E
>>>> Australia
>>>>
>>>>
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