The value of tmnxEthTunnelProtectionType specifies the model used for
determining which members are actively receiving and transmitting
data.
When the value is set to 'g8031-1to1 (1)', as per G.8031 spec, only two
members are allowed, and only one of them can be active at one point in
time.
When the value is set to 'loadsharing (2)', multiple members can be
active at one point in time.
The value of tmnxEthTunnelProtectionType can only be changed when
the corresponding tmnxPortEntry row object tmnxPortAdminStatus is set
to 'outOfService (3)'