This object is used to create and delete conceptual rows
in the cPtopoExtCdpTable.
Once this object has been set to 'active' it implies
that physical topology discovery via CDP has been enabled
for the local port for which this row exists.
This object cannot be set to 'active' when any rows that
were manually created for the local port exist in the
ptopoConnTable. After this object is set to 'active',
entries for this local port cannot be manually created in
the ptopoConnTable.
After the entry has been activated, this object cannot be
set to any value other than 'destroy'. The row status
never changes to 'notInService' after reaching the value
'active'.