Re: OSPF and Priorities

From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Mon Sep 08 2008 - 13:48:05 ART

Sorry, I'll go back to sleep now...

Paul Cosgrove wrote:
> 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
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
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>
> 

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