11-18-2010 01:58 PM - edited 03-06-2019 02:07 PM
Hi experts,
I have a switch stack. They are the following models and at the following firmwares:
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 30 WS-C3750E-24TD 12.2(53)SE2 C3750E-UNIVERSALK9-M
2 30 WS-C3750E-24TD 12.2(53)SE2 C3750E-UNIVERSALK9-M
3 26 WS-C3750V2-24PS 12.2(53)SE2 C3750-IPSERVICESK9-M
4 26 WS-C3750V2-24TS 12.2(53)SE2 C3750-IPSERVICESK9-M
5 12 WS-C3750G-12S 12.2(53)SE2 C3750-IPSERVICESK9-M
6 12 WS-C3750G-12S 12.2(53)SE2 C3750-IPSERVICESK9-M
Every time I reboot the switch stack the #3 will be elected as master. And yes I have the #1 set the highest priority.
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
*1 Master 0024.9813.7c80 15 1 Ready
2 Member 18ef.63b1.9980 14 1 Ready
3 Member 18ef.63f1.b300 1 0 Ready
4 Member a8b1.d4a5.ab00 1 0 Ready
5 Member d0d0.fde5.e880 1 0 Ready
6 Member d0d0.fde5.8580 1 0 Ready
I think the problem is that the first two switches take way longer to boot up than the rest so they will miss the "master" election process and that's why they can't be elected. Is there any way to fix this? Like a command to increase the timeout for the election process?
Another question is that if #3 is elected as master, is there a way to make the #1 master again other than rebooting the #3 switch?
Thanks!
Difan
11-18-2010 02:43 PM
Another question is that if #3 is elected as master, is there a way to make the #1 master again other than rebooting the #3 switch?
yes, on switch 3 issue "switch 1 priority 15"
Then
reload slot 3
This will reboot switch 3
HTH
Reza
11-18-2010 03:00 PM
Hi Reza,
Thanks for the reply but that will still require the switch 3 to be reloaded. Is there a way to make #1 master without reloading the #3?
Thanks,
11-18-2010 05:16 PM
As far as I the know, there is no way to force reelection without a reboot, or the failure of the master switch.
BTW, the reboot should need to happen very often. Once you get switch 1 to be the primary that should be good for a long time unless there is hardware failure or IOS upgrade. 3750s are in general pretty reliable switches.
HTH
Reza
11-19-2010 10:44 AM
Got it!
So is there anyway to slow down the boot time of the rest 3750 switches so there will be enough time for the first two switches to be up and participate in the master election?
Thanks,
11-19-2010 10:50 AM
There is no command to slow down the boot process. Maybe what you can do is to turn off all the switches then turn on the master first and after few seconnd turn on the rest. This way your master boots first
HTH
Reza
11-19-2010 11:12 AM
Hi Reza,
We can definitely do this when we are onsite. However this is just in case (etc, upgrading firmware) that we need to reboot it remotely... If there is no better way then I guess I have to get the #3 to reboot again to yeild the master!!
Thanks for the help,
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