Nssa

Hi,
I have R1 as ABR connected to both (Area 0) and (Area 1) and (Area 1) define as NSSA.
R1 received Type5 LSA from Area 0 for some external routes, my questions is did R1 convert Type5 as Type7 and forwarded to Area1 or not?

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Comments

Heero

I believe it just sends them into area 1 as type 5 routes. Type 7 routes come from a different AUTONOMOUS system connected to the nssa area. To send these type 7 routes outside of area 1, the abr has to convert them to type 5 for area 0 and then all the other areas to handle.

auos

Heero wrote: »

I believe it just sends them into area 1 as type 5 routes. Type 7 routes come from a different AUTONOMOUS system connected to the nssa area. To send these type 7 routes outside of area 1, the abr has to convert them to type 5 for area 0 and then all the other areas to handle.

I think area 1 did not accept type5 because it is NSSA.

auos

I found the answer in
OSPF Not-So-Stubby Area (NSSA) [IP Routing] - Cisco Systems.

billscott92787

The Type 5 LSAs are generated by using Type 7 LSAs, these get masked so that they are allowed into the NSSA area. When into the area, the Type 7 LSAs get translated back into Type 5 LSAs. Since by default Type 5 LSAs are not allowed to enter the NSSA area.