Reference Guide

974 | Stacking S-Series Switches
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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. FTOS displays console messages the local and remote
members of a flapping link, and on the primary and secondary 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 manager flaps. The remote member, Member 2, displays a
console message, and the manager and standby display KERN-2-INT messages.
To re-enable the downed stack-port, power cycle the offending unit.
------------------------------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/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 FTOS version, the unit does not come online, and FTOS cites a
card problem error, as shown in the following example. To recover, disconnect the new unit from the stack,
change the FTOS version to match the stack, and then reconnect it to the stack.
Stack#show system brief
Stack MAC : 00:01:e8:d5:f9:6f
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
---------------------------------------------------------------------------
0 Member card problem S25N unknown 7.7.1.1 52
1 Management online S50N S50N 7.8.1.0 52
2 Standby online S50V S50V 7.8.1.0 52
3 Member not present
4 Member not present
5 Member not present
6 Member not present
7 Member not present