Why is snmpd using random ports in Red Hat Enterprise Linux 5?

Issue

SNMP daemon is listening on random ports. As you can see in the below example, first it is listening on 32669, then 21364, then 38951.

Example

[root@XXX ~]# netstat -npul | grep snmpd
udp   0   0   0.0.0.0:32669     0.0.0.0   6799/snmpd     
udp   0   0   127.0.0.1:25375   0.0.0.0   6799/snmpd     
udp   0   0   0.0.0.0:161       0.0.0.0   6799/snmpd     

[root@XXX ~]# service snmpd restart
Stopping snmpd:          [  OK  ]
Starting snmpd:          [  OK  ]

[root@XXX ~]# netstat -npul | grep snmpd
udp   0   0   127.0.0.1:25375   0.0.0.0   9706/snmpd     
udp   0   0   0.0.0.0:161       0.0.0.0   9706/snmpd     
udp   0   0   0.0.0.0:21364     0.0.0.0   9706/snmpd