Re: Two queries on calculating AS external routes

[Acee Lindem <[e-mail]>]

Pat Murphy - [phone] wrote:

>Paresh,
>
>  
>
>>In my case below, what if the two LSAs are not quite
>>functoinally equivalent i.e what if the LSAs have the same
>>destination, same cost etc but have different non-zero
>>forwarding addresses ? What happens then ?  Do the same
>>tie-breaker rules apply or will it be implementation-dependent ?
>>    
>>
>
>The tie breaker rules are not applied. Here the installation 
>decision process is the same regardless of whether it is 
>comparing two Type 5 LSAs, or a Type 5 and a Type 7 LSA, or two 
>Type 7 LSAs. Whether or not both are installed depends on the 
>pruning done in step (c) as defined in RFC 2328 Section 16.4.1.
>  
>
Conceivably, you still could end up with LSAs with differing forwarding 
addresses of equal
cost and equivalent path preference for the prefix. I don't believe this 
case is covered. However,
since the forwarding address costs are equal, I don't think there should 
be any loops.

>Pat
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>  
>