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 trac 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 trac on the new master switch is uninterrupted. The control plane manages
the Protocol trac.
3. A member switch is elected as the new standby. Data trac 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 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 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
UNIT------------------------------------------
10:55:18: %STKUNIT1-M:CP %KERN-2-INT: Error: Stack Port 52 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 52 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
Protocol and control plane recovery requires time before the switch is fully online.
836
Stacking