Service Manual

After the units are reloaded, the system reboots. The units come up as standalone units after the reboot
completes.
Troubleshoot an S-Series Stack
To troubleshoot an S-Series stack, use the following recovery tasks.
• Recover from Stack Link Flaps
• Recover from a Card Problem State on an S-Series Stack
Recover from Stack Link Flaps
S-Series stack link integrity monitoring enables units to monitor their own stack ports and disable any
stack port that flaps five times within 10 seconds.
Dell Networking OS displays console messages for the local and remote members of a flapping link, and
on the primary (master) and standby 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 master and 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 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 an S-Series Stack
If 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 card problem error.
To recover, disconnect the new unit from the stack, change the Dell Networking OS version to match the
stack, and then reconnect it to the stack.
Example of Card Problem Error on an S-Series Stack - Different Dell Networking OS Versions
stack-1#show system brief
Stack MAC : 00:01:e8:8a:fd:6e
940
Stacking