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Knowledge Base

Stack management link disconnected cause stack backup switch reboot

Publication Date:  2014-09-11  |   Views:  1940  |   Downloads:  0  |   Author:  SU1000720830  |   Document ID:  EKB1000037988


Issue Description

CE12800 version V100R002C00SPC200. Two CE12800 use mainboard mode to establish stack system. We use 4 ethernet cable to connect the SIP port on the engine board, and enable the DAD two master detect. After stack system established, disconnect the 4 stack management link, the stack slave switch rebooted.

Alarm Information

After disconnecting the 4 stack management link, the stack slave switch rebooted. 

Handling Process

After stack established, check the state by command display switchover state to make sure whether stack system is finally established,
<CE12800>display switchover state
Chassis : 1~2
Switchover State : Ready --------------- When this is completed,means stack established
Switchover Policy : Board Switchover
MainBoard : 1/5
SlaveBoard : 2/5
ColdSlave : 1/6
ColdSlave : 2/6
then disconnect stack management links, stack system trigger DAD function normally, the slave switch ports be shutdown.

Root Cause

Stack slave switch will shutdown all the ports excluding stack ports after disconnecting stack management link,when we enable the DAD function.
The analysis found that when stack system just established, the stack related data is synchronizing. If disconnect the stack management links at same time,will lead to stack salve switch reboot.


It doesn't mean stack system established if use command display device shown all the card registed finish. The stack synchronization data is still running.If we test the stack system reliability, please use command display switchover state to check whether the stack established.