Merry Xmas!

I recently installed PRTG Network Monitor on my server in order to monitor my local infrastructure.
I set up the SNMP Agent on the Billion Router (Enable, Read Community: Public, Set Community: private, Trap Manager: My Servers IP address) and I can see it listed as Gateway with each LAN port, DNS, PING and WAN port showing however I'm not seeing any network traffic at all)
Are you able to help at all?
Thanks
Jon