I struggled to find a way to monitor stack ports up/down status with SNMP. I logged a TAC case and was told that this was not possible. I think the TAC engineer was attempting to use interface OIDs which don't work when the ports are assigned as stack ports.
Digging through the MIBs for CBS350, I found some useful information. Using snmptranslate on Ubuntu, I was able to convert the MIBs to OID. I then discovered these series of OIDs that monitored the stack ports.
Hope this may help someone in the future.
For CBS350-4x, I found this OID to be useful
1.3.6.1.4.1.9.6.1.101.53.23.1.3.52 = 3 when connected, 0 when not connected
the last digit, .52 corresponds to the interface index number. In this case, I am monitoring Te4 of a CBS350-24T-4X. 1 - 48 corresponds to the copper ports (even though this switch only has 24 copper ports).
Te3 = switch 1 index # 51 and switch 2 index # 103
Te4 = switch 1 index # 52 and switch 2 index # 104
OIDs in the same area:
From a stack with all stack ports connected (switch 1 te3 -> switch 2 te3, and switch 1 te4 -> switch 2 te4).
1.3.6.1.4.1.9.6.1.101.53.23.1.1.51 = "103" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.1.52 = "104" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.1.103 = "51" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.1.104 = "52" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.51 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.52 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.103 = "1" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.104 = "1" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.51 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.52 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.103 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.104 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.51 = "1" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.52 = "1" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.103 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.104 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.51 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.52 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.103 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.104 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.51 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.52 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.103 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.104 = "3" [ASN_INTEGER]
Another stack with Te4 disconnected:
1.3.6.1.4.1.9.6.1.101.53.23.1.1.51 = "103" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.1.52 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.1.103 = "51" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.1.104 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.51 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.52 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.103 = "1" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.2.104 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.51 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.52 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.103 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.3.104 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.51 = "1" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.52 = "1" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.103 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.4.104 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.51 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.52 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.103 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.5.104 = "0" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.51 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.52 = "2" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.103 = "3" [ASN_INTEGER]
1.3.6.1.4.1.9.6.1.101.53.23.1.6.104 = "2" [ASN_INTEGER]
