linkUpDownNotifications ( unable to test linkdown traps )

We are using net-snmp 5.5.1

Snip from my snmpd.conf

*defaultMonitors         yes*
*#linkUpDownNotifications yes*
*notificationEvent  linkUpTrap    linkUp   ifIndex ifAdminStatus
ifOperStatus*
*notificationEvent  linkDownTrap  linkDown ifIndex ifAdminStatus
ifOperStatus*
*trap2sink localhost:162 <http://10.10.10.188:162>*

snip of snmpwalk on the ifTable

*IF-MIB::ifDescr.1 = STRING: lo*
*IF-MIB::ifDescr.2 = STRING: eth0*
*IF-MIB::ifDescr.3 = STRING: vboxnet0*
*
*
*
*

The linkup trap for loopback interface
ifconfig lo down
ifconfig lo up

2011-08-25 12:57:30 <UNKNOWN> [UDP: [10.10.10.188]:52447->[10.10.10.188]]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (1182290) 3:17:02.90
SNMPv2-MIB::snmpTrapOID.0 = OID: IF-MIB::linkUp.1 IF-MIB::ifIndex = INTEGER:
1
IF-MIB::ifAdminStatus = INTEGER: up(1) IF-MIB::ifOperStatus = INTEGER: up(1)

The linkup trap for eth0 interface
ifconfig eth0 down
ifconfig  eth0 up

2011-08-25 14:47:08 localhost.localdomain [UDP:
[127.0.0.1]:59619->[127.0.0.1]]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (1188868) 3:18:08.68
SNMPv2-MIB::snmpTrapOID.0 = OID: IF-MIB::linkUp.1 IF-MIB::ifIndex = INTEGER:
2
IF-MIB::ifAdminStatus = INTEGER: up(1) IF-MIB::ifOperStatus = INTEGER: up(1)


Can anyone help me in simulating the linkdown trap. ?

Also can the *send_linkUpDownNotification*s function defined in *
 ifTable_data_access.c* be used for generating these traps ?

Thanks
-anand

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