[mrtg] sum router interface (SNMP)

[David Obando]

Dear all,

I'm tracking several router interfaces with mrtg for the traffic. The
graph shows the in and out data, I would like to additionally see a sum
of both in and out in the graph.
Is it possible to get the sum within the mrtg configuration or do I need
to write a script of my own?

Thanks and regards,
David

-- 
The day microsoft makes something that doesn't suck is the day they start making vacuum cleaners.
gpg --keyserver pgp.mit.edu --recv-keys 1920BD87
Key fingerprint = 3326 32CE 888B DFF1 DED3  B8D2 105F 29CB 1920 BD87