LLDP frame transmission statistics for a particular port.
The port must be contained in the same chassis as the
LLDP agent.
All counter values in a particular entry shall be
maintained on a continuing basis and shall not be deleted
upon expiration of rxInfoTTL timing counters in the LLDP
remote systems MIB of the receipt of a shutdown frame from
a remote LLDP agent.
All statistical counters associated with a particular
port on the local LLDP agent become frozen whenever the
adminStatus is disabled for the same port.