vMX

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!!

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.

------------------------------
Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home
------------------------------

Original Message:
Sent: 02-03-2021 23:54
From: Unknown User
Subject: Total stubby area question

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!!

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!!!
Original Message:
Sent: 02-04-2021 05:46
From: STEVE PULUKA
Subject: Total stubby area question

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.

------------------------------
Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home

Original Message:
Sent: 02-03-2021 23:54
From: Unknown User
Subject: Total stubby area question

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!!

Original Message:
Sent: 2/4/2021 5:46:00 AM
From: spuluka
Subject: RE: Total stubby area question

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.

------------------------------
Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home
------------------------------

Original Message:
Sent: 02-03-2021 23:54
From: Unknown User
Subject: Total stubby area question

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!!