SNMP not updating
SNMP objects in expert branch don't update.
It pop-up in following scenario:
1. slave switch is started with no ntp configured
2. read via snmp from slave
3. master switch is started with no ntp configured
4. slave sync to master and set it's time, by this system clock on slave is set to earlier date
5. read via snmp from slave will end up in the same results in expert branch of MIB.
Our part of SNMP implementation uses "time" function for calculating SNMP's cache timeouts. When clock is set backwards then cache can be valid for very long time.
Monotonic clock should be used instead.