Posts Tagged ‘nssa’


Tonight I’m posting some updates to the IEWB-RS Volume 1 Version 5.0 section of OSPF, along with an interesting teaser on how OSPF path selection works towards external routes originated in an NSSA. In my pursuit of networking Nirvana, I have a motto; learn something new every day. This topic for sure will fall into that category for many engineers.

We all (hopefully) know what an NSSA is in OSPF. It’s that cute little area that’s sort of stubby, but not completely, which allows us to cut down on the size of the OSPF database while still doing redistribution into an area. What is a little lesser known fact however, is how calculation towards an external route originated in an NSSA differs from a normal route redistributed into OSPF. Check the above link for the detailed walkthrough of how this works, along with the diagram and initial configs for those of you that don’t already have a subscription to the product, but the spirit of the situation is as follows… Continue Reading

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