Were finally putting in ipv6, but we have issues with our upstreams since they provide smaller networks for the links than /64.
In mikrotik it says unreachable and we cant ping them. If we use the link local fe80 then it works and also the links carry ipv4 without any problem. Its a CCR1036-12G-4S-EM and all upstreams are on SFP ports.
Example is Cogent 2001:978:2:a4::2:0/112.