Represents the type of data-link encapsulation
in which the protocol designated by
extremeVlanProtocolDefName is carried.
The value any(1) is used to indicate
a wildcard and matches all encapsulations and
protocol IDs that are not explicitly mentioned
in this table. Entries of type any(1) may not
be created. The value none(5) is used to indicate
that no protocol IDs match this entry. A value
of none(5) may not be set by a manager.