Concept Guide

After the units are reloaded, the system reboots. The units come up as standalone units after the reboot completes.
Troubleshoot a Stack
To troubleshoot a stack, use the following recovery tasks.
• Recover from Stack Link Flaps
• Recover from a Card Problem State on a Stack
Recover from Stack Link Flaps
Stack link integrity monitoring enables units to monitor their own stack ports and disable any stack port that aps ve times within 10
seconds.
Dell EMC Networking OS displays console messages for the local and remote members of a apping link, and on the primary (master) and
standby management units as KERN-2-INT messages if the apping port belongs to either of these units.
In the following example, a stack-port on the master aps. The remote member, Member 2, displays a console message, and the master
and standby display KERN-2-INT messages.
To re-enable the downed stack-port, power cycle the oending unit.
Example of Console Messages About Flapping Link
---------------------MANAGMENT UNIT------------------------------
Error: Stack Port 50 has flapped 5 times within 10 seconds.Shutting down this st
ack 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 w
ithin 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.
---------------------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 Stack
If a unit added to a stack has a dierent Dell EMC Networking OS version, the unit does not come online and Dell EMC Networking OS
cites a card problem error.
To recover, disconnect the new unit from the stack, change the Dell EMC Networking OS version to match the stack, and then reconnect
it to the stack.
Example of Card Problem Error on a Stack - Dierent Dell EMC Networking OS Versions
stack-1#show system brief
Stack MAC : 00:01:e8:8a:fd:6e
Reload Type : normal-reload [Next boot : normal-reload]
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
-----------------------------------------------------------
0 Standby card problem S4810 unknown 64
1 Management online S4810 S4810 8-3-10-223 64
Stacking
1003