Stack master flip


The power dropped to my master and thus the two switches flipped roles. How do I flip them back without just power cycling the now master?

4 replies

Userlevel 7
Hi Mike,

Assuming these are Summits, you can log into the stack and run the command 'run failover' to fail over mastership to the backup. However, this will cause the current master to reboot.

-Brandon
Sorry, yes, Summit x400s.
I meant to include this in my initial post... and forgot:

* Stk Master:36 # show stacking

Stacking Data Base
==================

Common Info
Mode : Dup-No-Ring State : Up-Master Stacking : Enabled
Master Slot: 2 Switches: 2 Local Slot: 2
Config Slot: 1 Next Potential Master Slot : 1

Previous Stack Master : 00:04:96:18:58:46
Slot 1: State SLAVE
Status : Enabled Master : No MAC : 00:04:96:18:58:46
Binding : Active Cpu Pri : 15 Platform : S400-48t
Slot-Mac : Loose Cfg Pri : 15 Cfg Slot : None
Stacking Ports: 2
Port-1 *1:52
Port-2 *1:53
Slot 2: State MASTER
Status : Enabled Master : Yes MAC : 00:04:96:34:DD:C7
Binding : Active Cpu Pri : 13 Platform : S400-48t
Slot-Mac : Loose Cfg Pri : 13 Cfg Slot : None
Stacking Ports: 2
Port-1 *2:52
Port-2 *2:53
Fallback IP 10.1.1.6 NetMask 255.255.255.0
Slot 3: Empty

Slot 4: Empty

Slot 5: Empty

Slot 6: Empty

Slot 7: Empty

Slot 8: Empty

--------------------------------------------------------------------------------

<*> - Indicates Stacking Enabled
- Indicates Stacking Disabled
* Stk Master:37 #
I reboot the second switch and the master goes back to the right switch, but the stack is still running on the fallback IP.

Stk Master:1 # show stacking

Stacking Data Base
==================

Common Info
Mode : Dup-No-Ring State : Up-Master Stacking : Enabled
Master Slot: 1 Switches: 2 Local Slot: 1
Config Slot: None Next Potential Master Slot : 2

Slot 1: State MASTER
Status : Enabled Master : Yes MAC : 00:04:96:18:58:46
Binding : Active Cpu Pri : 15 Platform : S400-48t
Slot-Mac : Loose Cfg Pri : 15 Cfg Slot : None
Stacking Ports: 2
Port-1 *1:52
Port-2 *1:53
Slot 2: State SLAVE
Status : Enabled Master : No MAC : 00:04:96:34:DD:C7
Binding : Active Cpu Pri : 13 Platform : S400-48t
Slot-Mac : Loose Cfg Pri : 13 Cfg Slot : None
Stacking Ports: 2
Port-1 *2:52
Port-2 *2:53
Fallback IP 10.1.1.6 NetMask 255.255.255.0
Slot 3: Empty

Slot 4: Empty

Slot 5: Empty

Slot 6: Empty

Slot 7: Empty

Slot 8: Empty

--------------------------------------------------------------------------------

<*> - Indicates Stacking Enabled
- Indicates Stacking Disabled

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