OSPF - Redistribution of Static Routes in Stub Areas

RouterOS Forwarding Protocols
1

Hi,

I need to redistribute to backbone some static routes from a OSPF router inside a totally stub area. (to route extra prefixes to some clients that do not are in my OSPF scenario)

I’ve tried to apply the following option in this specific router:

routing > ospf > instances > default > redistribute static routes=yes

But it seems that totally stub areas do not forward the static routes that I’ve tried to redistribute. :frowning:

Then, I saw in some place that NSSA can help me to redistribute external routes, converting LSA type 7 (that are allowed to get to the ABR) in LSA type 5 that will be flooded to backbone and all areas. :smiley:

The question is: Will NSSA really solve the problem? Is NSSA stable in version 5 and 6?

Best Regards…

2

I can’t speak about Mikrotik ROS stability - but in general, you’ve described the very reason for NSSA.

Stub areas are designed to block external routes. An OSPF router will not send LSA type 5 on an interface that is part of a stub/totally stub area. If you want an ASBR (one which redistributes) then you must use NSSA, or else convert to a standard area and accept most of your routing table from the backbone.