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?
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?
Comments
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Heero
Member Posts: 486
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
Member Posts: 186
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
Member Posts: 186
I found the answer in
OSPF Not-So-Stubby Area (NSSA) [IP Routing] - Cisco Systems. -
billscott92787
Member Posts: 933
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.