monitor ntpd process and generate a trap

I want to monitor ntpd process with my agent and generate a trap if ntpd is down.
# ps -ef|grep ntp
ntp      30732     1  0 12:01 ?        00:00:00 ntpd -u ntp:ntp -p /var/run/ntpd.pid -g
root     22267 28041  0 13:17 pts/3    00:00:00 grep ntp

# cat /usr/local/share/snmp/snmpd.conf
rwuser "admin"
authtrapenable 1

trap2sink      172.20.11.72
#informsink      172.20.11.72 public

proc    ntpd

iquerySecName _internal
rouser        _internal

# Active the standard monitoring entries
defaultMonitors         yes
linkUpDownNotifications yes

#trapsess 172.20.11.72:162 -u "admin" -a SHA -A "12345678" -x DES -X "87654321" -v 3 -l authh
Priv


I do
createUser  _internal MD5 somejunk
in the file /var/net-snmp/snmpd.conf
createUser _internal SHA 12345678 DES 87654321
createUser admin SHA 12345678 DES 87654321


# service ntpd restart
Shutting down ntpd:                                        [  OK  ]
Starting ntpd:                                             [  OK  ]

The 172.20.11.72 computer do not receive any trap from ntpd restart.

However, the 172.20.11.72 computer receive a trap from this command:
snmptrap -v 3 -u admin -l authPriv -a SHA -A 12345678 -x DES -X 87654321 172.20.11.72 42 coldStart.0




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