I don't think LSA's are considered Functionally equivalent with
different or zero forwarding address. So need to consider both LSA's in
route calc. 

Nitin

 

________________________________

From: Abhishek Bhalotia [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, July 18, 2007 12:55 PM
To: [email protected]
Subject: [OSPF]Path prefrence for External LSA

 

Hi All,

 

I have a doubt related to Path preference rule when there are LSA with
different FA.

In RFC 3101 (NSSA option), section 2.5.6 (e) for calculating External
LSA states;

            (e) If the current LSA is functionally the same as an
                          installed LSA (i.e., same destination, cost
and non-zero
                       forwarding address) then apply the following
priorities in
                        deciding which LSA is preferred:
                         1. A Type-7 LSA with the P-bit set.
                         2. A Type-5 LSA.
                         3. The LSA with the higher router ID.
                      [NSSA]
 
My doubt is:
If the both LSAs have zero FA or different FA then should the above
preference rule be skipped 
and both LSAs be considered for SPF?

 

Thanks and Regards

Abhishek 

 

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