Enables or disables the CPU controlled learning on a port. The default behavior is hardware learning. By enabling this object software learning on that particular port is enabled. When CPU controlled learning is enabled, for the first time, packet will be copied to CPU and source MAC address learning will not happen in the hardware. When packet is received at PNAC - if the source MAC address is authorized, the packet will be allowed to go through further processing. Else, the packet will be dropped. When packets from authorized MAC address are received at VLAN, MAC learning will happen at VLAN and the same entry will be programmed in the hardware. Once the MAC address is learnt, further forwarding will happen at driver itself. The Mac address entries which are added through software learning are checked in periodical intervals for the HIT entry. If there is no traffic for that entry, the HIT flag won't be set. The entry will be removed from the hardware if the hit flag is not set. Note: When software learning is enabled, rate limiting to the port needs to be configured