Re: Clarification in NSSA

["Jeyanath Minto J - CTD, Chennai." <[e-mail]>]

hi Krishna,
    R2 maintain a List of this area's Nssa border Routers and ASBR.
Translator is Elected from this List.
    so , when u stopped the R3 , R2 removes the R3 from the List. And R2
will elect itself as a Translator ( because R3 is unreachable ) and
translate type 7 to Type 5.



Cheers
Minto Mascarenhas
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-----Original Message-----
From: Krishna Rao [mailto:[e-mail]]
Sent: Friday, June 27, 2003 11:50 AM
To: [e-mail]
Subject: Clarification in NSSA


Hi

I am basically testing RFC 3101 NSSA implementation. I find that
routes are missing in the Router (not in NSSA area) but is
conected to the Router in NSSA area through backbone area.


Topology Used in Testing
========================
  |-------------------------------|
  |                               |
  |                               |
  |                               |
R1-------------R2---------------R3
                 |                |
                 |                |
                 |                |
            --------------------------- NSSA area 0.0.0.1
                        |
                        |
                        |
                        R4
                        | area 0.0.0.1
                        |Import External Routes.
                        |

There are 2 areas in this Topology -
NSSA area 0.0.0.1 (R2, R3 and R4)
Remaining all the networks are in backbone area.

R1 is connected to R2 and R3 through backbone area. R2 and R3 are
connected through backbone area.

RouterID of R1 10.0.0.1
RouterID of R2 20.0.0.1
RouterID of R3 30.0.0.1

R3 is elected as Translator. Import external routes at R4. R1
holds the external routes.

Now, stop the router R3. R2 takes over as Translator.

BUT, now R1 doesnot hold the external routes.

I expect the R1 to hold the external routes. But as per RFC 3101
since R2 holds LSA generated by R3 which is of higher RouterID, R2
doesnot generate Type 5 LSAs. Is it correct. If this is the case,
then R1 would never hold the external routes.

Your response on this would be highly appreciated.

Thanks & Regards
Krishna





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