After modifying the contents of snmpd.conf, you can issue the command kill -HUP snmp Process ID. This command stops the snmp process. The command then sends a signal to the System Management Agent's master agent (snmpd) to reread snmpd.conf and implement the modifications that you introduced. The command might not always cause the master agent to reread the configuration file. Consequently, using the command might not always activate modifications in the configuration file.
Instead of using kill -HUP, restart the System Management Agent after adding modifications to snmpd.conf. Perform the following steps:
Type the following command:
# /etc/init.d/init.sma restart