SNMP Monitoring switch port status

[kerlerom]

I would like to monitor via snmp v2c (with centreon) all ports (Twe1/0/x) of a C9500_48Y4C switch (Stackwise),

but I can't find the proper OID (OperStatus). I tried Cisco MIB locator without success. 

How to proceed in order to identify the correct MIB and specific OID ?

snmpget/snmpwalk (from linux) prints out the complete set of OIDs (iso.3.6....) but

without name (only numeric values). 

Kind Regards

[Mark Elsen]

   - FYI : https://www.alvestrand.no/objectid/1.3.6.1.2.1.2.2.1.8.html

 M.