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Total stubby area question

  • 1.  Total stubby area question

    Posted 02-03-2021 23:54
    Hi everybody,
    Just out of curiosity,  can we have area 51 as shown below as total stubby area  even though it is multihomed to three ABR?  I do not find documentation that says we can't.
    Below all links are 1.5M  in area 51, therefore we  want minimize  any OSPF traffic in/out of area 51.  The other sites ( normal areas) also attached to area 0 but not shown for brevity.
    Thanks and have a good day!!


  • 2.  RE: Total stubby area question

     
    Posted 02-04-2021 05:46
    You can multi-home a totally stubby area.  Generally you insert a default route on each link and connect ospf neighbors normally.

    But you diagram seems to suggest having an area not connected to area 0 but some other area.  That is not allowed.  All areas need a connection to area 0 backbone.

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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
    http://puluka.com/home
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  • 3.  RE: Total stubby area question

    Posted 02-04-2021 12:50
    Thanks Spuluka!!
    Sorry for the confusion, yes all areas are touching area 0.
    You mentioned:
    Generally you insert a default route on each link and connect ospf neighbors normally.
    But once we have totally stubby area , ABR will suppress LSA5/LSA4,LSA3  ( exception LS3 0.0.0.0/0 will be announced into  total stubby area by ABR so I think we do not need insert a default route, as it happens automatically by ABR when totally stubby area is used).
    Let me know if I am missing anything.
    Much appreciated!!!


  • 4.  RE: Total stubby area question

    Posted 30 days ago
    Please disregard my last response.  Somehow I confused NSSA with total stubby area where  default route is injected  without user intervention ( at least for Cisco).
    Thanks!!

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