Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

Stack Member Fails

• Problem: A unit that is not the stack master fails in an operational stack.
• Resolution: If a stack member fails in a daisy chain topology, a split stack occurs. If a member unit fails in a ring topology, traffic is re-routed over existing stack links.

Dell#May 31 01:46:17: %STKUNIT3-M:CP %IPC-2-STATUS: target stack unit 4 not responding
                                    
                                    May 31 01:46:17: %STKUNIT3-M:CP %CHMGR-2-STACKUNIT_DOWN: Major alarm: Stack unit 4 down - IPC
                                    timeout
                                    
                                    Dell#May 31 01:46:17: %STKUNIT3-M:CP %IFMGR-1-DEL_PORT: Removed port: Te 4/1-32,41-48, Fo 4/
                                    49,53
                                    
                                    Dell#May 31 01:46:18: %STKUNIT5-S:CP %IFMGR-1-DEL_PORT: Removed port: Te 4/1-32,41-48, Fo 4/
                                    49,53
                                 

Unplugged Stacking Cable

• Problem: A stacking cable is unplugged from a member switch. The stack loses half of its bandwidth from the disconnected switch.
• Resolution: Intra-stack traffic is re-routed on another link using the redundant stacking port on the switch. A recalculation of control plane and data plane connections is performed.

Master Switch Fails

• Problem: The master switch fails due to a hardware fault, software crash, or power loss.
• Resolution: A failover procedure begins:

1. Keep-alive messages from the Aggregator master switch time out after 60 seconds and the switch is removed from the stack.
2. The standby switch takes the master role. Data traffic on the new master switch is uninterrupted. Protocol traffic is managed by the control plane.
3. A member switch is elected as the new standby. Data traffic on the new standby is uninterrupted. The control plane prepares for operation in Warm Standby mode.

Stack-Link Flapping Error

Problem/Resolution: Stacked Aggregators monitor their own stack ports and disable any stack port that flaps five times within 10 seconds. If the stacking ports that flap are on the master or standby, KERN-2-INT error messages note the units.

To re-enable a downed stacking port, power cycle the stacked switch on which the port is installed.

--------------------------------------MANAGMENT UNIT-----------------------------------------
                                    
                                    Error: Stack Port 49 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/module and
                                    power-cycle the stack.
                                    ---------------------------------------STANDBY UNIT------------------------------------------
                                    10:55:18: %STKUNIT1-M:CP %KERN-2-INT: Error: Stack Port 50 has flapped 5 times within 10
                                    seonds.Shutting down this stack port now.
                                    10:55:18: %STKUNIT1-M:CP %KERN-2-INT: Error: Please check the stack cable/module
                                    and power-cycle the stack.
                                    
                                 

Master Switch Recovers from Failure

• Problem: The master switch recovers from a failure after a reboot and rejoins the stack as the standby unit or member unit. Protocol and control plane recovery requires time before the switch is fully online.
• Resolution: When the entire stack is reloaded, the recovered master switch becomes the master unit of the stack.

Stack Unit in Card-Problem State Due to Incorrect Dell Networking OS Version

• Problem: A stack unit enters a Card-Problem state because the switch has a different Dell Networking OS version than the master unit. The switch does not come online as a stack unit.
• Resolution: To restore a stack unit with an incorrect Dell Networking OS version as a member unit, disconnect the stacking cables on the switch and install the correct Dell Networking OS version. Then add the switch to the stack as described in Adding a Stack Unit. To verify that the problem has been resolved and the stacked switch is back online, use the show system brief command.

Dell#show system brief
                                 Stack MAC : 00:1e:c9:f1:00:9b
                                 -- Stack Info --
                                 Unit UnitType  Status       ReqTyp          CurTyp          Version    Ports
                                 --------------------------------------------------------------------------
                                 0   Management online         PE-FN-410S-IOA  PE-FN-410S-IOA  1-0(0-1864) 12
                                 1   Standby    
                                 card problem PE-FN-410S-IOA  unknown                12
                                 2   Member    not present
                                 3   Member    not present
                                 4   Member    not present
                                 5   Member    not present
                              

Card Problem — Resolved

Dell#show system brief
                                 Stack MAC : 00:1e:c9:f1:04:82
                                 
                                 -- Stack Info --
                                 Unit UnitType  Status       ReqTyp        CurTyp          Version  Ports
                                 ----------------------------------------------------------------------
                                 0   Management online     PE-FN-410S-IOA  PE-FN-410S-IOA  1-0(0-1864) 12
                                 1   Standby 
                                 online PE-FN-410S-IOA  PE-FN-410S-IOA  1-0(0-1864) 12
                                 2   Member not present
                                 3   Member not present
                                 4  Member not present
                                 5  Member not present
                              

Stack Unit in Card-Problem State Due to Configuration Mismatch

• Problem: A stack unit enters a Card-Problem state because there is a configuration mismatch between the logical provisioning stored for the stack-unit number on the master switch and the newly added unit with the same number.
• Resolution: From the master switch, reload the stack by entering the reload command in EXEC Privilege mode. When the stack comes up, the card problem will be resolved.