IPv6 /48 in CentOS 6.8 from Router Advertisement

Hello…

I have a server on hand that the client has the need to put an IPv6 /48 block on the server. However in RA mode the router only advertises up to /60. Would anyone have any solution to put all the /48 addresses on the CentOS 6.8 server?

CCR1016-12G
RouterOS 6.38.5

Thank you to anyone who can give me a light.