LinkUp/Down trap

Jing Guan <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
I have the following directives in my snmpd.conf file to generate the LinkUp/Down trap:

notificationEvent  linkUpTrap    linkUp   ifIndex ifAdminStatus ifOperStatus
notificationEvent  linkDownTrap  linkDown ifIndex ifAdminStatus ifOperStatus
monitor -r 60 -u Admin -o sysUpTime.0 -e linkUpTrap "GlinkUp" ifOperStatus != 2
monitor -r 60 -u Admin -o sysUpTime.0 -e linkDownTrap "GlinkDown" ifOperStatus == 2

I have been getting the trap correctly 

SNMPv2c Trap Pdu: Community = public, Reqid = 251071075
Oid1 = 1.3.6.1.2.1.1.3.0 , Type = TimeTicks, Value = 00 hrs: 00 min: 01 sec
Oid2 = 1.3.6.1.6.3.1.1.4.1.0 , Type = ObjectID, Value = 1.3.6.1.6.3.1.1.5.4(Link Up)
Oid3 = 1.3.6.1.2.1.2.2.1.1.1 , Type = Integer, Value = 1
Oid4 = 1.3.6.1.2.1.2.2.1.7.1 , Type = Integer, Value = 1
Oid5 = 1.3.6.1.2.1.2.2.1.8.1 , Type = Integer, Value = 1
Oid6 = 1.3.6.1.2.1.1.3.0.1 , Type = NoSuchInstance, Value = NULL
Oid7 = 1.3.6.1.6.3.1.1.4.3.0 , Type = ObjectID, Value = 1.3.6.1.4.1.8072.3.2.10


But for a sudden, still with the same directive, the trap changes to
SNMPv2c Trap Pdu: Community = public, Reqid = 539457232
Oid1 = 1.3.6.1.2.1.1.3.0 , Type = TimeTicks, Value = 00 hrs: 00 min: 01 sec
Oid2 = 1.3.6.1.6.3.1.1.4.1.0 , Type = ObjectID, Value = 0.0.0
Oid3 = 1.3.6.1.2.1.2.2.1.1.1 , Type = Integer, Value = 1
Oid4 = 1.3.6.1.2.1.2.2.1.7.1 , Type = Integer, Value = 1
Oid5 = 1.3.6.1.2.1.2.2.1.8.1 , Type = Integer, Value = 1
Oid6 = 1.3.6.1.2.1.1.3.0.1 , Type = NoSuchInstance, Value = NULL

Why?

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