Indicates a failure in one of the stacking link. If this stack was connected in a ring, then the failure of a stacking link results in a chain stack instead of a ring. Another failure in the chain topology would result in a split stack. If the stack is connected in a meshed or star topology then multiple link failure may be tolerated. This trap may be generated by any unit within the stack and must indicate the source of the failure. The dellTrapSource should identify one end of the link where the failure is detected. The dellTrapInfo may provide additional information about the failure.