I'm trying to tidy up my MRTG graphing.

What i would like to do is be able, somehow, via SNMP to retrieve the
IP address of the device connected to any particular port.

It doesn't have to be done in MRTG, as long as somehow through SNMP i
can pull of enough detail to get an IP somehow.

I am trying to pull these stats, currently, from an Extreme Summit 7i.
Any ideas?