The set of ports that are permanently assigned to the
egress list for this VLAN by management. Changes to a
bit in this object affect the per-port, per-VLAN
Registrar control for Registration Fixed for the
relevant GVRP state machine on each port. A port may
not be added in this set if it is already a member of
the set of ports in dot1qVlanForbiddenEgressPorts. The
default value of this object is a string of zeros of
appropriate length, indicating not fixed.