SNMP: Load OT at System Startup time

I've installed the SNMP (Simple Network Management Protocol) agent that ships with Mac OS 8.5, but when I try to access the workstation from my console, I get the message "unreachable via SNMP". I've verified that TCP/IP is working on my computer. What else could be wrong? Is this a known issue with OT/SNMP?
Background: SNMP is a network management protocol that allows a console to collect and analyze data from agents on the network. Mac OS 8.5 includes SNMP agent software that will allow Macintosh workstations to report information to third-party consoles using SNMP.

To run SNMP agent software on a Macintosh, you must initialize the TCP/IP at system startup time for the software to load and for your computer to respond to SNMP queries. On any workstation running the SNMP agent software:

Upon restart, the workstation should be listening for SNMP communications. SNMP uses ports 161 and 162.
Published Date: Feb 20, 2012