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Stub area (OSPF)

Latest reply: Mar 17, 2019 13:26:36 1646 3 1 0 1

Hello there, everyone!


This post is about Stub area (OSPF). Please check out the information displayed below.


STUB AREA


Prevents external routes from flooding into an area.


  • Like Standard areas, Stub area routers will share Type 1 and Type 2 LSAs to build their topology tables.


  • Stub areas will also accept Type 3 LSAs to reach other areas.


  • Stub areas will not accept Type 4 or Type 5 LSAs, detailing routes to external networks.


The purpose of Stub areas is to limit the number of LSAs flooded into the area, to conserve bandwidth and router CPUs. The Stub’s ABR will automatically inject a default route into the Stub area so that those routers can reach the external networks. The ABR will be the next-hop for the default route. 


TOTALLY STUBBY AREA


Prevents both inter-area and external routes from flooding into an area.


  • Like Standard and Stub areas, Totally Stubby area routers will share Type 1 and Type 2 LSAs to build their topology tables.


  • Totally Stubby areas will not accept Type 3 LSAs to other areas.


  • Totally Stubby areas will also not accept Type 4 or Type 5 LSAs, detailing routes to external networks.


Again, the purpose of Totally Stubby areas is to limit the number of LSAs flooded into the area, to conserve bandwidth and router CPUs. The Stub’s ABR will instead automatically inject a default route into the Totally Stubby area, so that those routers can reach both inter-area networks and external networks. The ABR will be the next-hop for the default route.


NOT SO STUBBY AREA (NSSA)


Similar to a Stub area; prevents external routes from flooding into an area, unless those external routes originated

from an ASBR within the NSSA area.


  • Like Standard and Stub areas, NSSA area routers will share Type 1 and Type 2 LSAs to build their topology tables.


  • NSSA areas will also accept Network Summary (Type 3) LSAs, which contain the routes to reach networks in all other areas.


  • NSSA areas will not accept Type 4 or Type 5 LSAs, detailing routes to external networks.


  • If an ASBR exists within the NSSA area, that ASBR will generate Type 7 LSAs. 


TOTALLY NOT SO STUBBY AREA (TNSSA)


Similar to a Totally Stubby area; prevents both inter-area and external routes from flooding into an area, unless those external routes originated from an ASBR within the NSSA area.


  • Like Standard and Stub areas, TNSSA area routers will share Type 1 and Type 2 LSAs to build their topology tables.


  • TNSSA areas will not accept Type 3 LSAs to other areas.


  • TNSSA areas will not accept Type 4 or Type 5 LSAs, detailing routes to external networks.


  • If an ASBR exists within the TNSSA area, that ASBR will generate Type 7 LSAs.


With the exception of not accepting inter-area routes, TNSSA areas are identical in function to NSSA areas.


This would be all on Stub area (OSPF). Thanks for reading this post!

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sim_157
Created Feb 22, 2019 05:59:14

it's helpful when learning ospf
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sim_157
Created Feb 22, 2019 05:59:28

thanks for sharing,
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Diaa_Mohamed
Created Mar 17, 2019 13:26:36

Posted by sim_157 at 2019-02-21 23:59 it's helpful when learning ospf
You are welcome my bro Stub area (OSPF)-2890665-1
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