Steps to reproduce:
Use Template Module Interface (Simple) SNMPx against router with vpn connections

Result:
Trigger like: "Interface tun15: High bandwidth usage >95%" is triggered for interfaces with no speed defined.

Expected:
Either

• Trigger for high bandwidth usage is either not created by discovery for items without a maximum speed
• Trigger contains check for maxspeed > 0 in problem expression
• An option to set an explicit maximum speed by macros.