The tmnxEthTunnelConfigEntry contains information pertaining to an
individual Ethernet Tunnel Group.
Rows in this table are created and destroyed using the
tmnxEthTunnelRowStatus object.
A corresponding row in the tmnxPortTable will exist for each row in
this table, based on the tmnxEthTunnelOperEntry
tmnxEthTunnelChassisIndex and tmnxEthTunnelIfIndex object pair.
The tmnxPortEntry corresponding to this entry manages the
administration, description, MAC address and other port related
configuration.