How to graph RRD data from DEVMON

[Klomp, H.]

I would like to create graphs from the devmon output of cisco switches. For this, I found a document "How to if_* grpah
from Devmon to Hobbit". 
However I can't find the extra-rrd.pl program 

Is there anyone outthere who is able to tell me how to use the data from devmon to create a rrd graph ? 

Regards, 

Bert Klomp
NLR
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