Recover from Stack Link FlapsStack link integrity monitoring enables units to monitor their own stack ports and disable any stack port that flaps five times within 10seconds.Dell Networking OS displays console messages for the local and remote members of a flapping link, and on the primary (master) andstandby management units as KERN-2-INT messages if the flapping port belongs to either of these units.In the following example, a stack-port on the master flaps. The remote member, Member 2, displays a console message, and the masterand standby display KERN-2-INT messages.To re-enable the downed stack-port, power cycle the offending unit.Example of Console Messages About Flapping Link---------------------MANAGMENT UNIT------------------------------Error: Stack Port 50 has flapped 5 times within 10 seconds.Shutting down this stack port now.Error: Please check the stack cable/module and power-cycle the stack.10:55:20: %STKUNIT1-M:CP %KERN-2-INT: Error: Stack Port 50 has flapped 5 times within 10 seconds.Shutting down this stack port now.10:55:20: %STKUNIT1-M:CP %KERN-2-INT: Error: Please check the stack cable/moduleand power-cycle the stack.---------------------STANDBY UNIT--------------------------------10:55:18: %STKUNIT1-M:CP %KERN-2-INT: Error: Stack Port 50 has flapped 5 times within 10seonds.Shutting down this stack port now.10:55:18: %STKUNIT1-M:CP %KERN-2-INT: Error: Please check the stack cable/moduleand power-cycle the stack.---------------------MEMBER 2-----------------------------------Error: Stack Port 51 has flapped 5 times within 10 seconds.Shutting down this stack port now.Error: Please check the stack cable/module and power-cycle the stack.Recover from a Card Problem State on a StackIf a unit added to a stack has a different Dell Networking OS version, the unit does not come online and Dell Networking OS cites a cardproblem error.To recover, disconnect the new unit from the stack, change the Dell Networking OS version to match the stack, and then reconnect it tothe stack.Example of Card Problem Error on a Stack - Different Dell Networking OS Versionsstack-1#show system briefStack MAC : 00:01:e8:8a:fd:6eReload Type : normal-reload [Next boot : normal-reload]-- Stack Info --Unit UnitType Status ReqTyp CurTyp Version Ports-----------------------------------------------------------0 Standby card problem S4810 unknown 641 Management online S4810 S4810 8-3-10-223 642 Member not present3 Member not present4 Member not present5 Member not present6 Member not present7 Member not present8 Member not present9 Member not present10 Member not present11 Member not present918 Stacking
