05-15-2009 05:31 AM - edited 03-06-2019 05:44 AM
Hi guys,
I'm using the document High Availability Campus Network Design Routed Access Layer using EIGRP or OSPF
to design my network...
Here the link...
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a00805fccbf.pdf
Anybody see problems if I change the Totally Stub Areas to NSSA Areas to permite redistribute external OSPF networks in the NSSA Areas in the future..
Basically, I wanna change
area XXX stub no-summary
to
area XXX nssa no-redistribution no-summary
I think both are in the best practices, I just wanna confirm that...
Thanks in Advanced
My Best Regards,
Andre Lomonaco
05-15-2009 06:29 AM
Hello Andre,
you should be fine.
My only doubt is that you may need also
area XXX nssa default-information-
originate
(Optional) Used to generate a Type 7 default into the NSSA area. This keyword takes effect only on the NSSA ABR or the NSSA Autonomous System Boundary Router (ASBR).
on the NSSA ABR(s) to have a default route pointing to core.
I mean ABR generates an 0 IA 0.0.0.0/0 for a stub area automatically for an NSSA you may need to add this option.
see
http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_osp1.html#wp1011294
Hope to help
Giuseppe
05-15-2009 10:05 AM
I agree with Guiseppe that you should be fine. He is using the Totally NSSA so a default route will be generated automatically. The "area XXX nssa default-information-originate" is only used for NSSA as noted by Guiseppe. I would also note that you will not see any redistributed routes in your Totally NSSA with the "no-redistribution" only command Type 7 LSA's will be seen along with the default route will only be seen in your area.
HTH
Jonathan
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