Hi Alexandr,
can you please confirm the below understanding?
you have enabled the VLAN monitoring on all the ports of a VLAN. You were able to fetch this information via SNMP without any issues.
The port is now added as a LAG port and not a standalone port. After this change, the SNMP is no longer able to fetch the VLAN statistics. Is that correct?
if I understood this right, can you please check from the CLI of the switch, if the VLAN statistics still works for that port?
Please share the following outputs:
show VLAN statistics
show conf | include monitor
show port information detail.
Model and the software version of the switch.
Looking forward to your response!