The set of ports configured by management in this VLAN
to which all multicast group-addressed frames are to be
forwarded. Ports entered in this list will also appear
in the complete set shown by dot1qForwardAllPorts. This
value will be restored after the device is reset. This
only applies to ports that are members of the VLAN,
defined by dot1qVlanCurrentEgressPorts. A port may not
be added in this set if it is already a member of the
set of ports in dot1qForwardAllForbiddenPorts. The
default value is a string of ones of appropriate length,
to indicate the standard behaviour of using basic
filtering services, i.e., forward all multicasts to all
ports.
The value of this object MUST be retained across
reinitializations of the management system.