The desired authorized MAC address for this port. This can be either a regular station address to configure a specific address, or it can be one of the following special values to specify the address learning method: FFFF-FFFF-FFFE: learnOnce. First source MAC address heard on this port becomes the authorized address. Setting this value initiates learning of a new authorized address. When a new authorized address is learned, it will be stored in nonvolatile memory. This variable will return learnOnceConditionally to a GET operation after it has been set to this value. FFFF-FFFF-FFFD: learnOnceConditionally. This option will initiate learning of a new authorized address only if the previous hubSecPtSecurityAddress was set to a specific address or learnContinuous. No action will be performed if the previous value was already learnOnceConditionally. FFFF-FFFF-FFFC: learnContinuous. Any address heard becomes the new authorized address. When a new address is learned, it may cause an alarm, but it does not store anything in nonvolatile memory.