Adding a 3850 to make a switch stack.

Unanswered Question
Feb 4th, 2014
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Hi all,


I would like to get opinions on how to setup a new 3850 to make it work in a stack. I will be replacing a 3550 in production with a new 3850. This is what I have:



Switch 1: 3850 [ws-c3850-24p] Lan base


Switch Ports Model              SW Version        SW Image              Mode

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

     1 32    WS-C3850-24P       03.02.02.SE       cat3k_caa-universalk9 BUNDLE


Switch 2: 3550 [ws-c3550-24-pwr]


C3550 Software (C3550-I5Q3L2-M), Version 12.1(22)EA8a, RELEASE SOFTWARE (fc1)


New switch: 3850 [ws-c3850-24p] Lan base

Switch Ports Model              SW Version        SW Image              Mode

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

*    1 32    WS-C3850-24P       03.03.01SE        cat3k_caa-universalk9 INSTALL


My goal is to pre-configure the new switch with the info from the 3550, send the switch to the site, and be able to make it work in a stack with the 3850 under production.


My thoughts:


- Change SW 1 priority to 15

- Change New switch priority to 12

- On SW 1: #switch 2 provision ws-c3850-24p

- On SW 1: configure switch 2 interfaces to match SW 2 after introducing the command above

- Upgrade IOS on SW 1 to match New switch

- Connect stack cables (New switch power OFF)

- Power ON New switch

- Get a drink


I did a #switch 1 renumber 2 on the New switch, but it didn't chage the switch number.



Will this work? Or should I

- Change SW 1 priority to 15

- Change New switch priority to 12

- On New switch: configure interfaces to match SW 2

- Upgrade IOS on SW 1 to match New switch

- Connect stack cables (New switch power OFF)

- Power ON New switch

- Get a drink



Regards,

G


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Furose M Sun, 03/09/2014 - 22:14
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  • Cisco Employee,

Ok.. The new switch is pretty good. its running the recommended IOS-XE version(3.3.1) and is in recommended mode (Install).

 

1st you need to change the mode to "install" mode in the old switch and upgrade the IOS to 3.3.1.

this doc will help you.

https://supportforums.cisco.com/docs/DOC-39667

 

1. switch number will take effect once after the reload.

 

this will definately work.

- Upgrade IOS on SW 1 to match New switch

- Change SW 1 priority to 15

- Connect stack cables (New switch power OFF)

- Power ON New switch

- On SW 1: #switch 2 provision ws-c3850-24p

- On SW 1: configure switch 2 interfaces to match SW 2 after introducing the command above

- Get a drink

- update me in this thread.

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