R2 and R1 area in area 51. R1 is an ABR to area 0. R2 is an ABR to area 12. So a virtual link is configured between R2 and R1. area 12 is a NSSA. So it has a route in its routing table, which is O N2. This route is not getting exchanged to R1. Even though virtual link is working fine, and other routes are exchanged between R2 and R1.
First, i suggest you issue show ip ospf d ex command on R2 to check if R2 translate LSA type-7 to type-5, because in normal condition, this translation is needed. I think the answer would be no. If yes, i think maybe because that, in virtual link condition, R2 just work as a ABR between area 0 and area 12, O EX2 SLA should flood to other non-stub area, so i think the reason seems like R2 does not translate N2 to EX2, but i don't know why, maybe VL is not work for this condition.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...