Administrator Guide

Stack-Link Flapping Error
Problem/Resolution: Stacked MXL 10/40GbE Switches monitor their own stack ports and disable any stack port that aps ve
times within 10 seconds. If the stacking ports that ap 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.
The following is an example of the stack-link apping error message.
--------------------------------------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.
----------------------------------------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.
Master Switch Recovers from Failure
• Problem: The master switch recovers from a failure after a reboot and rejoins the stack:
– As a member unit if there is already a standby
– As a standby if there is no standby in the stack
The 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 dierent the 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 the Dell Networking OS version as a member unit, disconnect the stacking
cables on the switch and install the correct the 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:f1:01:57
Reload Type : normal-reload [Next boot : normal-reload]
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
------------------------------------------------------------------
0 Management online MXL-10/40GbE MXL-10/40GbE 8-3-16-79 56
1 Member
card problem MXL-10/40GbE unknown 56
2 Standby online MXL-10/40GbE MXL-10/40GbE 8-3-16-79 56
3 Member not present
4 Member not present
5 Member not present
Stacking
779