The following IP address prefixes are not allowed by the routing protocols and the Route Table Manager and are not be populated within the forwarding table:
0.0.0.0/8 or longer
127.0.0.0/8 or longer
224.0.0.0/4 or longer
240.0.0.0/4 or longer
Any other prefixes that need to be filtered can be filtered explicitly using route policies.