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NSSA Area

Created: Nov 14, 2018 11:49:24Latest reply: Nov 22, 2018 15:53:55 1019 3 1 0 0
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Hi, community!

Where we use NSSA Area.and whete totally NSSA any one explain me.

  • x
  • convention:

Featured Answers
rociot
Created Nov 14, 2018 17:54:21

Hi :)

An NSSA area can import AS external routes. An ASBR uses Type 7 LSAs to advertise the imported AS external routes to the entire NSSA area. These Type 7 LSAs are translated into Type 5 LSAs on an ABR, and are then flooded in the entire OSPF AS. An ABR in an NSSA area advertises Type 7 default routes to the entire NSSA area. All inter-area routes must be advertised by the ABR.

A totally NSSA area can import AS external routes. An ASBR uses Type 7 LSAs to advertise the imported AS external routes to the entire NSSA area. These Type 7 LSAs are translated into Type 5 LSAs on an ABR, and are then flooded in the entire OSPF AS. An ABR in a totally NSSA area advertises Type 3 and Type 7 default routes to the entire totally NSSA area. All inter-area routes must be advertised by the ABR.

So, NSSA will block external routes LSA type 5, but allow inter area routes LSA type 3 and 4 and injects default route. And totally NSSA will block external as well as Inter area routes, and inject default route.
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  • x
  • convention:

All Answers
rociot
rociot Created Nov 14, 2018 17:54:21

Hi :)

An NSSA area can import AS external routes. An ASBR uses Type 7 LSAs to advertise the imported AS external routes to the entire NSSA area. These Type 7 LSAs are translated into Type 5 LSAs on an ABR, and are then flooded in the entire OSPF AS. An ABR in an NSSA area advertises Type 7 default routes to the entire NSSA area. All inter-area routes must be advertised by the ABR.

A totally NSSA area can import AS external routes. An ASBR uses Type 7 LSAs to advertise the imported AS external routes to the entire NSSA area. These Type 7 LSAs are translated into Type 5 LSAs on an ABR, and are then flooded in the entire OSPF AS. An ABR in a totally NSSA area advertises Type 3 and Type 7 default routes to the entire totally NSSA area. All inter-area routes must be advertised by the ABR.

So, NSSA will block external routes LSA type 5, but allow inter area routes LSA type 3 and 4 and injects default route. And totally NSSA will block external as well as Inter area routes, and inject default route.
View more
  • x
  • convention:

Protocol
Protocol Created Nov 15, 2018 07:14:14

Thank you for reply. ..my question is that where weuse NSSA and totally NSSA ....in which scenario
we use these types.
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  • x
  • convention:

rociot
rociot Created Nov 22, 2018 15:53:55

Hi dear, you can review next links, are topologies and configuration about NSSA and totally NSSA.

http://support.huawei.com/hedex/ ... als%2Bof%2BOSPF

http://support.huawei.com/hedex/ ... 253C%252Fb%253E

http://support.huawei.com/hedex/ ... als%2Bof%2BOSPF
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  • x
  • convention:

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