How to force a cache reload when dynamic interfaces creating/removing

Dear coders,

I implemented ifTable subagent using mib2c.mfd.conf, it works great but I
have some questions about CACHE. I want to trigger a cache reload only when
dynamic interfaces creating/removing happen. I do not want to use cache
flag NETSNMP_CACHE_AUTO_RELOAD because of performance reason. So I tried to
call the cache load routine directly when dynamic interfaces
creating/removing happen. The problem is I got the Error: OID not
increasing:

$snmpwalk 10.1 ifIndex
IF-MIB::ifIndex.1 = INTEGER: 1
IF-MIB::ifIndex.2 = INTEGER: 2
IF-MIB::ifIndex.3 = INTEGER: 3
IF-MIB::ifIndex.4 = INTEGER: 4
IF-MIB::ifIndex.4 = INTEGER: 4
Error: OID not increasing: IF-MIB::ifIndex.4
>= IF-MIB::ifIndex.4

My cache flag has only NETSNMP_CACHE_DONT_INVALIDATE_ON_SET flag on.

My questions are:
What is the proper way to force a cache reload at anytime? in my case it's
when dynamic interfaces creating/removing happen.
Do I need to register a separate cache handler to do this?
Is there some sort of cache flag combination to achieve this goal?

Any advice would be greatly appreciated.
Emi



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