Status of this entry. Setting the value to 'invalid' invalidates the entry, corresponding directly to the CLEAR INTERNET SECURITY command. It is an implementation-specific matter as to whether the agent removes an invalidated entry from the table. Setting this object to 'valid' has no effect. When creating a new instance, one must set psEntryAddress, psEntryMask, psEntryAccess, psEntryDirection and psEntryPortList for the new instance in the same physical set request. Furthermore, if one wishes to change an entry, one must first delete it and then add it with its new values.