IfAlias: is it updated when changed on device?

IfAlias: is it updated when changed on device?

We made some tests changing the interface description on router (Cisco router).

We noticed NO change in the interface description, but deleting the interface.
Questions:

1) Do OpManager poll interface for changing at fixed/configurable times?
2) Can we force a re-mapping with ifAlias?

Regards.
L











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