I was using a Cisco 2970 running IOS 12.2(44)SE but had to downgrade it to IOS 12.2(25)SEB4 for testing purposes.
In doing so, the SNMP EngineID of the device changed. Only the last 2 bytes changed, but it changed none the less.
Prev Engine ID running 12.2(44)SE was xxxxcc340 but after downgrading to 12.2(25)SEB4, it changed to xxxxcc301.
Is this normal or is this just something special with this device and/or the above listed IOS's?
I inquire because when the SNMP EngineID changes, my configuration for remote engineID also needs to be changed and with that, all users and groups for that device must also be re-created to work with the new EngineID.
Finally, the NMS server must also re-learn the new EngineID as well making it one big PITA.
Is this true for ALL upgrades as well as downgrades regardless of platform or what?
Any info appreciated.