How to graph Mikrotik's interfaces or simple Queues

[ltadu]

Hello All,

in my network l have two Mikrotik equipments( One is PPPoE server for PPPoE connexion and other is Hotspot server).
so users can get connected to my network using PPPoE session or Hotspot page.

l'd like to graph all bandwidth usage for those customers using Cacti.

l've install cacti 0.8.7c.

l'd like to know how to graph users trafic connected to PPPoE server and Hotspot server.

Thanks for your help.