R2(config-if)#ipv6 address 1023::2/64
% Invalid input detected at '^' marker.
this is what I am getting on my ipv6 six every time I try to apply it
it does work on one of my routers its running 12.4 version the other two
are running 12.3 version
I have tried the enable ipv6 commands
still get the same invalid error message
what is the straight answer to this one as
I can go no further till this is resolved.