Change Totally Stub to NSSA no-summary in Routed Access Layer Design

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May 15th, 2009
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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

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Giuseppe Larosa Fri, 05/15/2009 - 06:29
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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


jgreenwoodii Fri, 05/15/2009 - 10:05
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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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