[c-nsp] Monitor Backplane

[Big Wave Dave]

I'm in need of an SNMP string to monitor the "backplane" on a 3750. 
The only thing I've been able to find is:
http://www.cisco.com/warp/public/477/SNMP/cat-switch_backplane_util.html

Unfortunately this article specifies that this is for the CatOS, and
not IOS.  I need to find a similar solution for IOS.

I'm already monitoring CPU, Memory, etc... but the Cluster Engineers
want to know how much of the backplane is being used.

Thanks for any help!
Dave