Re: OSPF Order of Preference

hi all,
i wondering about which type of router a type-5 LSA and a type-7 LSA
can be found for the same destination.
does this could happen only on an ASBR/NSSAtranslator only?
thanks

2009/7/4 Lejoe <styran_at_gmail.com>:
> Hi,
>
> Yes ofcourse E1 will always be preferred over N1 (if both N1 and E1 have
> same cost) . I was talking about two E1s with Fowarding address set and
> without forwarding address set (FW:0.0.0.0)
>
>
> Lejoe
>
> On Sat, Jul 4, 2009 at 6:51 PM, Nicholas Davitashvili
> <nickda_at_gmail.com>wrote:
>
>> I recently saw a scenario, where two routes(E1 and N1) having Equal Cost,
>> were load balancing.
>> As soon as N1 was stripped of its FA, E1 became a preferred route.
>>
>> Nick
>> GREENNET
>> Lat: 41043'25.46"N
>> Long: 44045'45.60"E
>>
>>
>>
>> On Sat, Jul 4, 2009 at 11:51 AM, Lejoe <styran_at_gmail.com> wrote:
>>
>>> Hi Nick,
>>>
>>> I dont think the Forwarding Address should be part of the criteria because
>>> when two type 5 LSAs (assuming E1) to the same destination exists, one
> with
>>> FW address set and the other without.
>>>
>>> In this case, the LSA to be installed in the routing table of a router is
>>> based on the comparison that router's metric to the ASBR that generated
> the
>>> LSA with a forwarding address of 0.0.0.0 to that router's metric to reach
>>> the forwarding address of X , which was set for the LSA generated by the
>>> ASBR.
>>>
>>> Now assuming the metric was equal, I would believe the result is load
>>> balancing across the two paths. Hope that someone can shed more light on
>>> this. (equal costs with FW and without FW)
>>>
>>>
>>> Regards
>>>
>>> Lejoe
>>>
>>>
>>> On Sat, Jul 4, 2009 at 5:00 PM, Nicholas Davitashvili
> <nickda_at_gmail.com>wrote:
>>>
>>>> Additional criteria of course would be that costs are equal.
>>>>
>>>> Nick
>>>> GREENNET
>>>> Lat: 41043'25.46"N
>>>> Long: 44045'45.60"E
>>>>
>>>>
>>>> On Sat, Jul 4, 2009 at 10:26 AM, Nicholas Davitashvili
>>>> <nickda_at_gmail.com>wrote:
>>>>
>>>> > Hi Group,
>>>> >
>>>> > If anyone can confirm this order of preference in OSPF, I'd be really
>>>> > greatful.
>>>> > If it is wrong, please give the correct order:
>>>> >
>>>> > 1. O - OSPF Intra-Area
>>>> > 2. IA - OSPF Inter-Area
>>>> > 3. E1 /w FA -- External Type 1 With Forwarding Address
>>>> > 4. N1 /w FA
>>>> > 5. E1 /wo FA -- Ext. Type 1 with Forwarding Address set to 0.0.0.0
>>>> > 6. N1 /wo FA
>>>> > 7. E2 /w FA
>>>> > 8. N2 /w FA
>>>> > 9. E2 /wo FA
>>>> > 10. N2 /wo FA
>>>> >
>>>> > Thanks in advance!
>>>> >
>>>> > Nick
>>>> > GREENNET
>>>> > Lat: 41043'25.46"N
>>>> > Long: 44045'45.60"E
>
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