Your best course of action would be to get a tool that can do a MIB walk, so that you can pin down the exact information you want/need. There are a lot of good tools out there for doing this.
The SNMP OID for interface 3 status (up/down) looks like: 1.3.6.1.2.1.2.2.1.8.1000003
Bits Sent: 1.3.6.1.2.1.2.2.1.16.1000003
Bits Received: 1.3.6.1.2.1.2.2.1.10.1000003