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Hi all.
I have a small problem.
I have all my hardware being monitored and all is fine.
But.......
When i reboot an ATM switch on my network with modifycations, all my work is lost because the SNMP OID´s change, and reorder.
Is there a workaround to avoid this, or a flag to put on graphs ? I have a major software upgrade coming up on my network, and i realy want to fix this before i do so.
This is a known problem for all SNMP based management platforms. According to SNMP RFC OIDs may change after device reinitialization (simply speaking reboot ). And it happens in real life... e.g. MIB indexes of ATM subinterfaces of Cisco routers change frequently. It's even worse because some objects change even just after reconfiguration (not only reboot).
There is workaround for Cisco devices with IOS 12.2.1+ (I guess). In the configuration you have to enter the command:
snmp-server ifindex persist
Note that this fixes only OIDs of (sub)interfaces. If you monitor other MIB objects (like CoS queues) you have not guarantee that they are stable.
Another approach is snmpwalk MIB tree and update OIDs before main poll. MRTG can do it (e.g. mapping interface names to interface indexes before poll).
). And it happens in real life... e.g. MIB indexes of ATM subinterfaces of Cisco routers change frequently. It's even worse because some objects change even just after reconfiguration (not only reboot).