The value of this object is the VLanIndex of a particalur
entry in snVLanByPortTable (snVLanByPortVLanIndex).
All the attributes of that row of table except PortMask
will be used to set the same attributes for the
entire VLan group. VLanId and PortMask must be set for
that particular entry prior to setting this object.
Switch software will base on that VLAN information
to set the entire VLAN.
Note: All the intended attributes of the given
row of the table (given VLAN) must be set prior
setting this object. When this object is set,
Set-All-VLAN action will take place simultaneously.
The previous setting will be overwritten by the
new one.