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Monitoring VLAN's can be rather tricky, not all devices from all vendors implement separate SNMP Counters for sub-interfaces, in some cases they're implemented but the counters are never incremented. Please review the following links, they all refer to similar scenarios (Logical Interfaces):
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
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