A policy must be implemented to keep Bogon/Martian rulesets up to date.
A Bogon route or Martian address is a type of packet that should never be routed inbound through the perimeter device. Bogon routes and Martian addresses are commonly found as the source addresses of DDoS attacks. By not having a policy implemented to keep these addresses up to date, the enclave will run the risk of allowing illegitimate traffic into the enclave or even blocking legitimate traffic. Also, if there are rulesets with "any" as the source address then Bogons/Martians must be applied.
Bogons and Martian addresses can be kept up to date routinely checking the IANA website or creating an account with Team Cymru to retrieve these lists in one of many ways.