extend and extendfix Not Started on Request

Hello,


I have the following snmpd.conf file on a freshly installed Debian server:

###########################################################################
rouser admin
smuxpeer .1.3.6.1.4.1.674.10892.1
extend 	drbd	“/usr/lib/nagios/plugins/check_drbd -d Configured"
extend	bonds	“/usr/lib/nagios/plugins/check_linux_bonding -s”


These “extends” are called by a Nagios server.
As you might guess, the bonds-extend checks, if all the bonds are up and not degraded.
This check is done, at least for quite some time, only once and then, only values from some kind of cache are returned. Meaning, I can disconnect a cable of the bond and Net-SNMP still says, that everything is ok.
So you might say, that I should change extend to extendfix. Then, my Nagios plugin returns the following error:

ERROR: retrieving OID 1.3.6.1.4.1.8072.1.3.2.4.1.2.5.98.111.110.100.115 table: The requested table is empty or does not exist.


But when I prepend an extend bonds… line just before the extendfix bonds…, like this:

###########################################################################
rouser admin
smuxpeer .1.3.6.1.4.1.674.10892.1
extend 		drbd	“/usr/lib/nagios/plugins/check_drbd -d Configured"
extend		bonds	“/usr/lib/nagios/plugins/check_linux_bonding -s”
extendfix	bonds	“/usr/lib/nagios/plugins/check_linux_bonding -s”


everything works flawlessly: I can disconnect or re-connect a cable and Nagios detects it immediately.
Could anybody explain me what happens?


Thanks a lot

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