The set of ports that are prohibited by management
from being included in the egress list for this VLAN.
Changes to this object that cause a port to be included
or excluded affect the per-port, per-VLAN Registrar
control for Registration Forbidden 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 dot1qVlanStaticEgressPorts. The default value of
this object is a string of zeros of appropriate length,
excluding all ports from the forbidden set.