You can configure RIPng to filter the routes to be sent.
ripng [ process-id ]
Based on the ACL:
filter-policy acl6-number export [ protocol [ process-id ] ]
Based on the prefix list:
filter-policy ipv6-prefix ipv6-prefix-name export [ protocol [ process-id ] ]
Based on the route policy:
filter-policy route-policy route-policy-name export [ protocol [ process-id ] ]
RIPng can filter the routes to be sent based on an IPv6 ACL, route-policy or an IPv6 prefix list. Only the routes that meet the match conditions are advertised to neighbors. If protocol is not specified in the command, all the routing information to be advertised will be filtered, including the imported routes and local RIPng routes (directly connected routes).