Hi,

We're currently using Observium v20.1.10233 and have a problem with "Error Drawing Graph" for all ports with a "Cust" prefix. Ports with "Core", "Peer" or "Transit" prefix correctly show graphs.

The ports we're monitoring are VLANs, the Peer/Transit are simple 802.1q VLANs, the Core/Customer VLANs are QinQ, i.e. two layers of 802.1q headers.

All port types are correctly detected by SNMP and listed against the Router. Given that "Core" displays graphs correctly, this doesn't seem to be related to QinQ, but specifically to the "Cust" prefix.

Examples that correctly show graphs, 1st is 802.1q, 2nd is QinQ:-

Peering: Datacom CHC<->Chorus [10Gbit] {Chorus SVID.100}

Core: Zelan Workshop, 50 Palmerston St, Westport [1Gbit] {Chorus CVID.100}

Example (QinQ) that gives "Error Drawing Graph":-

Cust: GDC Westland Recreation Centre, 83 High St, Greymouth [100Mbit] {Chorus CVID.113}

All our routers are MikroTik, so can't determine if this is a router OS/hardware specific issue.