Users Guide

Feb 13 15:26:19: %STKUNIT4-M:CP %IFMGR-5-OSTATE_DN: Changed interface state to
down: Te 2/1
Feb 13 15:26:19: %STKUNIT4-M:CP %IFMGR-5-OSTATE_DN: Changed interface state to
down: Po 1
Feb 13 15:26:19: %STKUNIT4-M:CP %IFMGR-1-DEL_PORT: Removed port: Te 2/0-11,20-23,
Fo 2/
48,52,56,60,
Feb 13 15:26:19: %STKUNIT3-S:CP %IFMGR-1-DEL_PORT: Removed port: Te 2/0-11,20-23,
Fo 2/
48,52,56,60,
Unplugged Stacking Cable
Problem: A stacking cable is unplugged from a member switch. The stack loses half of its bandwidth from the
disconnected switch.
Resolution: Intra-stack traffic is re-routed on another link using the redundant stacking port on the switch. A
recalculation of control plane and data plane connections is performed.
Master Switch Fails
Problem: The master switch fails due to a hardware fault, software crash, or power loss.
Resolution: A failover procedure begins:
1 Keep-alive messages from the master switch time-out after 60 seconds and the switch is removed from
the stack.
2 The standby switch takes the master role. Data traffic on the new master switch is uninterrupted. The
control plane manages the Protocol traffic.
3 A member switch is elected as the new standby. Data traffic on the new standby is uninterrupted. The
control plane prepares for operation in Warm Standby mode.
Stack-Link Flapping Error
Problem/Resolution: Stacked switches monitor their own stack ports and disable any stack port that flaps five
times within 10 seconds. If the stacking ports that flap 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 where the port is installed.
--------------------------------------MANAGMENT
UNIT-----------------------------------------
Error:
Stack Port 48 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 52 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
Stacking 1042