FEC feature design change

The FEC feature design has the following changes starting in FortiOS 7.0.2:

• FEC enabled on FortiGates running 7.0.2 is not backward compatible with FEC enabled on FortiGates running previous versions.
• In addition to enabling FEC on IPsec interfaces in previous versions, there is a new option, fec, that should also be enabled under the related firewall policy so the feature works:

  config firewall policy
      edit <id>
          set fec enable
      next
  end

• The fec option is not automatically enabled in a firewall policy when upgrading from a previous version. It must be enabled manually.