Reference Guide

720 | 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 Figure 39-22, 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.
Figure 39-22. Recovering from a Stack Link Flapping Error
Recover from a Card Problem State on an S-Series Stack
If a unit added to a stack has has a different FTOS version, the unit does not come online, and FTOS cites a
card problem error, as shown in Figure 39-23. To recover, disconnect the new unit from the stack, change
the FTOS version to match the stack, and then reconnect it to the stack.
Figure 39-23. Recovering from a Card Problem Error on an S-Series Stack (S50 type)
--------------------------------------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.
F
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