The value of tmnxCpmProtPolTableLastChanged indicates the
sysUpTime at the time of the last modification of an entry in the
tmnxCpmProtPolTable.
If no changes were made to the table since the last re-initialization
of the local network management subsystem, then this object
contains a zero value.
This object is not supported on SR-1 and ESS-1, where the
value of TIMETRA-CHASSIS-MIB::tmnxChassisType is '5',
and 7710, where the value of TIMETRA-CHASSIS-MIB::tmnxChassisType is
'7' or '9'.