assume i have the topology below :
now rip was redistributed into area0
the clear point is
now it will appear as type 5 , , and will not pass area 10 cause it is nssa
now the unclear point
now on asbr 2,
if i createf a route mapth and matched with it the external routers of ospf 1 and redistributed it into ospf process 2
will it be redistributed ?
my question is , does the asbr2 will convert the type 5 to 7 when it redistributed, or will reject it cause its type is 5
Area 0 will send only LSA 3 ( default route only) in any NSSA.
And regarding your query on LSA 5 to LSA 7 translation, it is always 7 to 5 and never 5 to 7.
thanks for ur reply ,
i know that type 5 will never enter nssa ,
but if i make a redistribution of a routes which was type 5 , will it enter the nss as type 7 ?
or only the ospf routes that type 1 2 3 4 and other routing protocols such eigrp , rip can be redistributed into nssa ?
anyway , i testes it on gns3 and it seems , type 5 cant be redistributed into nssa ,
hint i know that type 5 cant pass nssa , but my question was about redistributiong this type 5 and see if it will pass nssa
an OSPF NSSA area is intended to be used for those cases where:
A)-a stub area behaviour is desired with ABR nodes of the NSSA blocking all LSA type 5 and type 4 from entering the NSSA area. LSA type 3 can be blocked if the area is a totally NSSA (no summary option in ABR area configuration)
B) - within the NSSA area there is a need to inject routes in the OSPF domain and they are injected as LSA type 7
ABR can translate LSA type 7 to LSA type 5 at area border depending on the propagation bit P in the LSA type 7.
The opposite conversion of backbone learned LSA type 5 to type 7 to be injected in the NSSA area does not happen because it is still a stub area in this direction.
So your test confirms the theory as expected.
Hope to help