by Jay Whale » April 4th, 2011, 8:25 am
Sadly this is very dependant on the hardware of the device. Some of the older Cisco routers were only able to show a 'load' and did not identify the differnce between rxload and txload. On the newer Cisco devices there is only the option to probe the txload via SNMP.
The OID for Cisco txload is 1.3.6.1.4.1.9.2.2.1.1.24.x (where x is the interface number assigned), this will give you a result of 1-255 (the txload)
Assuming you had access to both sides of the cable connecting the two devices, you could probe for the txload of both sides. The txload of side A would be the rxload of side B, and of course the txload of side B would be the rxload of side A.
Hope this helps.