STP / ELRP issues..

We're seeing alot of the following errors... any idea on what this is?

Slot-1: Flushing FDB (Transitioned from 0 to 3, starting flush timer for 2:45)

Slot-2: pibFamFdbFilterAdd - STP filter 4(01:80:c2:00:00:00, 0) is not already added for 1:43 on VLAN 1.

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The first log message mentioned appears to indicate a flush FDB was received. Within STP a switch generally transmit a flush FDB when a topology change occurs.