[mrtg] Bandwidth of entire Switch

[Joel A Savage]

Hey all,

I have mrtg installed/running and polling all of my switches however I
can only seem to get it to poll all the ports in a switch to separate
graphs.

Can someone point me in the direction on how to setup a config file to
give me 1 graph of bandwidth that the entire switch is using instead of
a graph for each individual port? 

(These are Nortel switches (Baystacks and passports) 
 
 Thank you in advance. 

jas