SNMP OID for Bandwidth Usage

I am trying to monitor near-live bandwidth usage on a few PIX 501's and
515s with nagios. I found some plugins that will work for cisco
equipment and modified them slightly for the pixes but I can't seem to
get the bandwidth monitor functioning. I've been sifting through snmp
for the last hour looking in the 501 and 515 for this but can't find
it. Got it working on an ISR though no problem.

..
Telecom, Cabling and VoIP continues...
Tags: cabling telecom cabling Networking Ethernet