From: Leigh Bichard (leigh@clara.co.uk)
Date: Thu Nov 06 2003 - 05:36:28 GMT-3
Wherever OSPF needs to make a routing decision - so ideally across the whole
OSPF domain. That means all routers and all areas for consistency. I guess
you may decide not to use in some areas if you judge that is unlikely to
cause a problem. My feeling now is that if it comes up in a lab then I am
going to stick it everywhere
Thanks
Yasser Aly writes:
>
>
> Does this apply to routers in same area only or all routers even in
> different OSPF areas ?
>
>> From: "Leigh Bichard" <leigh@clara.co.uk>
>> Reply-To: "Leigh Bichard" <leigh@clara.co.uk>
>> To: "Rob Laidlaw" <laidlaw@consecro.com>
>> CC: ccielab@groupstudy.com
>> Subject: Re: OSPF auto-cost
>> Date: Wed, 05 Nov 2003 18:23:50 +0000
>>
>> Rob
>>
>> Makes sense.
>>
>> Thanks
>>
>> Rob Laidlaw writes:
>>
>>> Good rule of thumb is yes, so everyone is apple to apple. If you have
>>> two
>>> paths, and one guy is using a reference bandwidth of 1gig and the other
>>> is
>>> default, 100m, then the cost will be advertised different in the LSA's.
>>> Now
>>> lets assume that the best path is actually through the box with the
>>> auto-cost changed because he might have a oc-3 interface as opposed to
>>> the
>>> guy whose still at the default config with his 100 meg Ethernet. if you
>>> change the cost, on one but not the other, but router with the default
>>> config will advertise a cost of 1 with his lsa, and the modified router
>>> will
>>> advertise a cost of 6 or 7.
>>>
>>> Good rule of thumb is if you change one, change them all.
>>>
>>> -Rob
>>> ----- Original Message ----- From: "Leigh Bichard" <leigh@clara.co.uk>
>>> To: <ccielab@groupstudy.com>
>>> Sent: Wednesday, November 05, 2003 11:31 AM
>>> Subject: OSPF auto-cost
>>>
>>>
>>>> I can't find a definitive but does auto-cost, if changed, need to be
>>> applied
>>>> to all OSPF routers in ALL areas?
>>>>
>>>> Thanks
>>>>
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