I currently have a Nexus 7000 (n7000-s2-dk9.6.2.16.bin) that is trying to communicate with an ASR 1001-x (v03.16.07b.S).  Both IPv4 and IPv6 are configured on the two routers. OSPFv2 handshakes without issues whereas OSPFv3 gets stuck on the Nexus in...

So I have a series of customers that all have various manufacturers of dual stack home routers.  They are picking up both IPv4 and IPv6 addresses from me as well as a PD (prefix delegation) for their internal network (typically a /64, sometimes a /56...