Hi
Don’t know if I’m doing something wrong but it seems that you can’t set an IPv6 address for route filters.
ie
/routing filter add chain=iBGPwug-in prefix=2f00::100:0:0:0:0:0/48 action=discard
It just sets the prefix to empty.
If I try and do it with winbox it says that its not a valid ip?
Winbox doesnt work with ipv6 routing filters, but ive managed to make them work in CLI. You gotta be really careful not to open that rule in winbox and click okay…
add action=accept address-family=ipv6 chain=tunnelbroker-out comment=“”
disabled=no invert-match=no prefix=2620::xxx:0:0:0:0:0/48 prefix-length=
48
which routeros version? im on 3.30
4.5
Have not tested with 4.6 though can’t use that as there is a bug that causes the RB to fall over and go to 100% and stick there. We think that it has something to do with OSPF, either that or BGP.
I am using MT 4.11 and not yet functional from winbox or terminal. From terminal look only parameter writen but it look not functional. It is dangerous if prefix filter on IPv6 will not functional. 
ipv6 routing filters are functional. Only problem is that ipv6 prefixes cannot be added, edited in winbox.
You have to use console.
Oh sorry i tried it again and you are right. In console is it functional i didnt set prefix-length 