replacing a failed 3850 in a stack

[carl_townshend]

Hi All

We have a 3850 in a stack of 2 which has failed and we need to replace it.

The switch is the same type and has the same IOS.

Do I need to do anything else on the switch before we add it to the stack?

we can not have any outage.

Many thanks

Carl

[Reza Sharifi]

Please follow the instructions in this page:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/ha_stack_manager/configuration_guide/b_hastck_3se_3850_cg/b_hastck_3se_3850_cg_chapter_010.html#task_1177470

HTH

[carl_townshend]

Hi

I have already checked that and I am still unclear.

The only thing I can see is that it must have the same switch number, so should I just set this on the new switch before I add it?

Please advise

cheers

[Reza Sharifi]

Hi,

So, take a look at the priority on the switch that is currently in production.  It should be a number between 1-15.  So, if it says 15 or 10, you can leave the new switch as default which is 1. If you want to give it for example 5 than you simply add that before adding it to the stack. Just make sure the new switch you are adding has a lower priority than the switch that is working. 1 is the lowest and 15 is the highest.

HTH

[carl_townshend]

Hi, the switch that has failed did have a priority of 15, the one that is running has a priority of 1, see below

Switch# Role Mac Address Priority Version State
------------------------------------------------------------
1 Member 0000.0000.0000 0 0 Removed
*2 Active 00f8.2c12.2400 1 V03 Ready

So what do I need to do now ?

cheers

[Leo Laohoo]

1. Power down the faulty unit;
2. Remove the stacking cables; 
3. Install the replacement unit; 
4. WARNING:  Make sure the replacement unit is POWERED OFF; 
5. Connect the stacking cable; and
6. Power on the replacement unit