Replace master switch in stack

[katerina.dardoufa]

Hello community,

I have a stack of 2960S (c2960s-universalk9-mz.122-55.SE2.bin) and the master has failed (used to have a priority of 14). The second switch has become master (priority 1) as can be seen below:

Switch/Stack Mac Address : e8ba.702e.7b80

                                           H/W   Current

Switch#  Role   Mac Address     Priority Version  State

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

1       Member 0000.0000.0000     0      1       Removed            

*2       Master e8ba.702e.7b80     1      1       Ready              

If I connect a new blank 2960S (same IOS) through the stack ports, will the master sync its config to the new one without causing problems?

As I understand the new blank switch will also have a priority of 1 and will by default be numbered as 1. So if the config is correctly synced and I later on want to make switch 1 the master, I need to set the priority:

switch 1 priority 14

and reboot both switches?

Is this the correct procedure?

Please advise accordingly, since this is a working environment of great criticality!

P.S. The switches are provisioned:

switch 1 provision ws-c2960s-24ts-l

switch 2 provision ws-c2960s-24ts-l

Thanks in advance,

Katerina

[Christian Bauer · Accepted solution]

Hi Katerina,

the new switch will get the config from the master.

Also the new switch will NOT getting master until reload of the whole stack.

your procedure is correct - change prio of switches - and then reboot your stack.

but you don't have to change the master if you have 2 identical switches.

This is only important if you have a mixed-featureset-stack.

If you want your priorities fixed maybe you want to increase prio of 2nd switch also.

So if you want to expand or replace something in your stack you are always sure that

new switches (with prio 1) DON'T become master.

set Prio of 1st switch to 14 - and 2nd switch to something between 1 and 14...

Greets,

Christian

[katerina.dardoufa]

Thank you Christian for your answer. It's good to know that I'm on the right track

Going to proceed as stated and see how it goes.

[Leo Laohoo]

I presume the replacement unit has the same IOS version as the stack?

[katerina.dardoufa]

Yes, the replacement unit will have the same IOS, as not to run into trouble!

[Mayur Aher]

Hie Christian,

I have a stack of 3750G and i want to replace the master switch priority 15 coz of  faulty port .

And I receive new switch from cisco WS-C3750X-24

Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 30    WS-C3750X-24       12.2(55)SE4           C3750E-IPBASEK9-M

If I connect a new blank 3750X  through the stack ports, will the OLD switch   sync its config to the new one without causing problems? or i need to change switch only 

Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 24    WS-C3750G-24T      12.2(55)SE4           C3750-IPBASEK9-M
     2 24    WS-C3750G-24T      12.2(55)SE4           C3750-IPBASEK9-M

I change IOS of new switch to c3750e-ipbasek9-mz.122-55.SE4.bin 

Please help me with this.

Awaiting your reply.