Why -g option is always used with a command defined with pass directive for object specified in notificationEvent directive in Red Hat Enterprise Linux 6

Issue

• We want to send a trap upon a following notificationEvent configuration in snmpd.conf when the network interface events (linkup/linkdown) happens.

notificationEvent  linkUpTrap    linkUp   ifIndex ifAdminStatus ifOperStatus ifalias
notificationEvent  linkDownTrap  linkDown ifIndex ifAdminStatus ifOperStatus ifalias

• Also, we are using 'pass' directive to make information for ifAlias as below.

pass .1.3.6.1.2.1.31.1.1.1.18 /etc/snmp/ifalias.pl

• We found that -g option is always used with this command, it never use -n option.