Here's a good link in performing an IOS upgrade on a stack of Cisco 3850 switches. You just need to copy the new .bin file on the Active (Master) switch and the software install process (a macro command) will replicate and extract a copy to the Member switch in the stack.
3850#show switch
Switch/Stack Mac Address : c025.5c85.1234 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active c025.5c85.1234 10 V02 Ready
2 Standby c025.5c85.5678 1 V02 Ready
3850#software install file flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin ?
auto-rollback Auto-rollback time
force Proceed with installation without performing peer package compatibility checks
new Create a new package provisioning file. After installation, only packages contained in the installed bundle will
be part of the committed package set
on-reboot Suppress reload prompt and do not reload after installation
provisioning-file Provisioning file to use for installation
switch Switch(es) where install operation is performed. Default is all switches
verbose Verbose output
<cr>
3850#software install file flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin switch ?
Valid switch ids: 1,2
Multiple switch ids may be specified using a
comma separated list or '-' separated range
For example:
1,3,4 specifies switch ids 1, 3 and 4
1-3 specifies switch ids 1, 2 and 3
WORD Switch id(s)
3850#software install file flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin switch 1-2
Preparing install operation ...
[1]: Copying software from active switch 1 to switch 2
[1]: Finished copying software to switch 2
[1 2]: Starting install operation // [1 2] MEANS SWITCH 1 AND 2
[1 2]: Expanding bundle flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
[1 2]: Copying package files
[1 2]: Package files copied
[1 2]: Finished expanding bundle flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
[1 2]: Verifying and copying expanded package files to flash:
[1 2]: Verified and copied expanded package files to flash:
[1 2]: Starting compatibility checks
[1 2]: Finished compatibility checks
[1 2]: Starting application pre-installation processing
[1 2]: Finished application pre-installation processing
[1]: Old files list:
Removed cat3k_caa-base.SPA.03.06.04.E.pkg
Removed cat3k_caa-drivers.SPA.03.06.04.E.pkg
Removed cat3k_caa-infra.SPA.03.06.04.E.pkg
Removed cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
Removed cat3k_caa-platform.SPA.03.06.04.E.pkg
Removed cat3k_caa-wcm.SPA.10.2.140.0.pkg
[2]: Old files list:
Removed cat3k_caa-base.SPA.03.06.04.E.pkg
Removed cat3k_caa-drivers.SPA.03.06.04.E.pkg
Removed cat3k_caa-infra.SPA.03.06.04.E.pkg
Removed cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
Removed cat3k_caa-platform.SPA.03.06.04.E.pkg
Removed cat3k_caa-wcm.SPA.10.2.140.0.pkg
[1]: New files list:
Added cat3k_caa-base.SPA.03.06.07E.pkg
Added cat3k_caa-drivers.SPA.03.06.07E.pkg
Added cat3k_caa-infra.SPA.03.06.07E.pkg
Added cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
Added cat3k_caa-platform.SPA.03.06.07E.pkg
Added cat3k_caa-wcm.SPA.10.2.170.0.pkg
[2]: New files list:
Added cat3k_caa-base.SPA.03.06.07E.pkg
Added cat3k_caa-drivers.SPA.03.06.07E.pkg
Added cat3k_caa-infra.SPA.03.06.07E.pkg
Added cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
Added cat3k_caa-platform.SPA.03.06.07E.pkg
Added cat3k_caa-wcm.SPA.10.2.170.0.pkg
[1 2]: Creating pending provisioning file
[1 2]: Finished installing software. New software will load on reboot.
[1 2]: Committing provisioning file
[1 2]: Do you want to proceed with reload? [yes/no]: yes
<OUTPUT TRUNCATED>
3850#show verson | inc INSTALL
* 1 32 WS-C3850-24T 03.06.07E cat3k_caa-universalk9 INSTALL
2 32 WS-C3850-24T 03.06.07E cat3k_caa-universalk9 INSTALL
3850#show switch
Switch/Stack Mac Address : 580a.2006.1234 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1234 10 V03 Ready
2 Standby 580a.201b.5678 1 V03 Ready
3850#software clean
Preparing clean operation ...
[1 2]: Cleaning up unnecessary package files
[1 2]: No path specified, will use booted path flash:packages.conf
[1 2]: Cleaning flash:
[1]: Preparing packages list to delete ...
In use files, will not delete:
cat3k_caa-base.SPA.03.06.07E.pkg
cat3k_caa-drivers.SPA.03.06.07E.pkg
cat3k_caa-infra.SPA.03.06.07E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
cat3k_caa-platform.SPA.03.06.07E.pkg
cat3k_caa-wcm.SPA.10.2.170.0.pkg
packages.conf
[2]: Preparing packages list to delete ...
In use files, will not delete:
cat3k_caa-base.SPA.03.06.07E.pkg
cat3k_caa-drivers.SPA.03.06.07E.pkg
cat3k_caa-infra.SPA.03.06.07E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
cat3k_caa-platform.SPA.03.06.07E.pkg
cat3k_caa-wcm.SPA.10.2.170.0.pkg
packages.conf
[1]: Files that will be deleted:
cat3k_caa-base.SPA.03.06.04.E.pkg
cat3k_caa-drivers.SPA.03.06.04.E.pkg
cat3k_caa-infra.SPA.03.06.04.E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
cat3k_caa-platform.SPA.03.06.04.E.pkg
cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
cat3k_caa-wcm.SPA.10.2.140.0.pkg
packages.conf.00-
[2]: Files that will be deleted:
cat3k_caa-base.SPA.03.06.04.E.pkg
cat3k_caa-drivers.SPA.03.06.04.E.pkg
cat3k_caa-infra.SPA.03.06.04.E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
cat3k_caa-platform.SPA.03.06.04.E.pkg
cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
cat3k_caa-wcm.SPA.10.2.140.0.pkg
packages.conf.00-
[1 2]: Do you want to proceed with the deletion? [yes/no]: yes
[1 2]: Clean up completed
You might encounter a Member switch that wouldn't join the stack after the upgrade process. The show switch will display a V-Mismatch state on a Member switch. Just issue a reload slot <SWITCH NUMBER> to reboot the specific Member switch again.
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 580a.201b.2222 1 0 V-Mismatch
3850#terminal monitor // MONITOR THE MEMBER SWITCH STATE
3850#reload slot 2
Stack is in Half ring setup; Reloading a switch might cause stack split
Proceed with reload? [confirm] // JUST HIT ENTER
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 0000.0000.0000 0 0 Removed
000156: Feb 14 04:30:46.687 UTC: %STACKMGR-1-STACK_LINK_CHANGE: 1 stack-mgr: Stack port 1 on switch 1 is up
000157: Feb 14 04:30:50.630 UTC: %STACKMGR-6-SWITCH_ADDED: 1 stack-mgr: Switch 2 has been added to the stack.
000158: Feb 14 04:31:01.271 UTC: %STACKMGR-6-SWITCH_READY: 1 stack-mgr: Switch 2 is ready.
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 580a.201b.2222 1 0 Initializing
000159: Feb 14 04:31:01.276 UTC: Starting SWITCH-ADD sequence, switch 2
000160: Feb 14 04:31:03.367 UTC: %NGWC_USB_CONSOLE-6-CONFIG_ENABLE: Switch 2: Console media-type changed to default
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 580a.201b.2222 1 V03 Syncing
000165: Feb 14 04:31:23.510 UTC: SWITCH-ADD sequence complete, switch 2
3850#show switch
Switch/Stack Mac Address : 580a.2006.2980 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.2980 1 V03 Ready
2 Member 580a.201b.9480 1 V03 Ready
It's also best practice to hard code the switch priority (default is 1) in order to avoid this kind of issue. I've set switch 1 with a priority of 10 (higher is better) in order to always be the Active (Master) switch in the stack.
3850#switch ?
<1-9> Switch Number
3850#switch 1 ?
priority Set the priority of the specified switch
renumber Renumber the specified switch number
stack Stack port enable or disable
3850#switch 1 priority ?
<1-15> Switch Priority
3850#switch 1 priority 10
WARNING: Changing the switchpriority may result in a configuration change for that switch. Do you want to continue?[y/n]y
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 10 V03 Ready
2 Standby 580a.201b.2222 1 V03 Ready
3850#show switch
Switch/Stack Mac Address : c025.5c85.1234 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active c025.5c85.1234 10 V02 Ready
2 Standby c025.5c85.5678 1 V02 Ready
3850#software install file flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin ?
auto-rollback Auto-rollback time
force Proceed with installation without performing peer package compatibility checks
new Create a new package provisioning file. After installation, only packages contained in the installed bundle will
be part of the committed package set
on-reboot Suppress reload prompt and do not reload after installation
provisioning-file Provisioning file to use for installation
switch Switch(es) where install operation is performed. Default is all switches
verbose Verbose output
<cr>
3850#software install file flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin switch ?
Valid switch ids: 1,2
Multiple switch ids may be specified using a
comma separated list or '-' separated range
For example:
1,3,4 specifies switch ids 1, 3 and 4
1-3 specifies switch ids 1, 2 and 3
WORD Switch id(s)
3850#software install file flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin switch 1-2
Preparing install operation ...
[1]: Copying software from active switch 1 to switch 2
[1]: Finished copying software to switch 2
[1 2]: Starting install operation // [1 2] MEANS SWITCH 1 AND 2
[1 2]: Expanding bundle flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
[1 2]: Copying package files
[1 2]: Package files copied
[1 2]: Finished expanding bundle flash:cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
[1 2]: Verifying and copying expanded package files to flash:
[1 2]: Verified and copied expanded package files to flash:
[1 2]: Starting compatibility checks
[1 2]: Finished compatibility checks
[1 2]: Starting application pre-installation processing
[1 2]: Finished application pre-installation processing
[1]: Old files list:
Removed cat3k_caa-base.SPA.03.06.04.E.pkg
Removed cat3k_caa-drivers.SPA.03.06.04.E.pkg
Removed cat3k_caa-infra.SPA.03.06.04.E.pkg
Removed cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
Removed cat3k_caa-platform.SPA.03.06.04.E.pkg
Removed cat3k_caa-wcm.SPA.10.2.140.0.pkg
[2]: Old files list:
Removed cat3k_caa-base.SPA.03.06.04.E.pkg
Removed cat3k_caa-drivers.SPA.03.06.04.E.pkg
Removed cat3k_caa-infra.SPA.03.06.04.E.pkg
Removed cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
Removed cat3k_caa-platform.SPA.03.06.04.E.pkg
Removed cat3k_caa-wcm.SPA.10.2.140.0.pkg
[1]: New files list:
Added cat3k_caa-base.SPA.03.06.07E.pkg
Added cat3k_caa-drivers.SPA.03.06.07E.pkg
Added cat3k_caa-infra.SPA.03.06.07E.pkg
Added cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
Added cat3k_caa-platform.SPA.03.06.07E.pkg
Added cat3k_caa-wcm.SPA.10.2.170.0.pkg
[2]: New files list:
Added cat3k_caa-base.SPA.03.06.07E.pkg
Added cat3k_caa-drivers.SPA.03.06.07E.pkg
Added cat3k_caa-infra.SPA.03.06.07E.pkg
Added cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
Added cat3k_caa-platform.SPA.03.06.07E.pkg
Added cat3k_caa-wcm.SPA.10.2.170.0.pkg
[1 2]: Creating pending provisioning file
[1 2]: Finished installing software. New software will load on reboot.
[1 2]: Committing provisioning file
[1 2]: Do you want to proceed with reload? [yes/no]: yes
<OUTPUT TRUNCATED>
3850#show verson | inc INSTALL
* 1 32 WS-C3850-24T 03.06.07E cat3k_caa-universalk9 INSTALL
2 32 WS-C3850-24T 03.06.07E cat3k_caa-universalk9 INSTALL
3850#show switch
Switch/Stack Mac Address : 580a.2006.1234 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1234 10 V03 Ready
2 Standby 580a.201b.5678 1 V03 Ready
3850#software clean
Preparing clean operation ...
[1 2]: Cleaning up unnecessary package files
[1 2]: No path specified, will use booted path flash:packages.conf
[1 2]: Cleaning flash:
[1]: Preparing packages list to delete ...
In use files, will not delete:
cat3k_caa-base.SPA.03.06.07E.pkg
cat3k_caa-drivers.SPA.03.06.07E.pkg
cat3k_caa-infra.SPA.03.06.07E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
cat3k_caa-platform.SPA.03.06.07E.pkg
cat3k_caa-wcm.SPA.10.2.170.0.pkg
packages.conf
[2]: Preparing packages list to delete ...
In use files, will not delete:
cat3k_caa-base.SPA.03.06.07E.pkg
cat3k_caa-drivers.SPA.03.06.07E.pkg
cat3k_caa-infra.SPA.03.06.07E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E7.pkg
cat3k_caa-platform.SPA.03.06.07E.pkg
cat3k_caa-wcm.SPA.10.2.170.0.pkg
packages.conf
[1]: Files that will be deleted:
cat3k_caa-base.SPA.03.06.04.E.pkg
cat3k_caa-drivers.SPA.03.06.04.E.pkg
cat3k_caa-infra.SPA.03.06.04.E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
cat3k_caa-platform.SPA.03.06.04.E.pkg
cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
cat3k_caa-wcm.SPA.10.2.140.0.pkg
packages.conf.00-
[2]: Files that will be deleted:
cat3k_caa-base.SPA.03.06.04.E.pkg
cat3k_caa-drivers.SPA.03.06.04.E.pkg
cat3k_caa-infra.SPA.03.06.04.E.pkg
cat3k_caa-iosd-universalk9.SPA.152-2.E4.pkg
cat3k_caa-platform.SPA.03.06.04.E.pkg
cat3k_caa-universalk9.SPA.03.06.07.E.152-2.E7.bin
cat3k_caa-wcm.SPA.10.2.140.0.pkg
packages.conf.00-
[1 2]: Do you want to proceed with the deletion? [yes/no]: yes
[1 2]: Clean up completed
You might encounter a Member switch that wouldn't join the stack after the upgrade process. The show switch will display a V-Mismatch state on a Member switch. Just issue a reload slot <SWITCH NUMBER> to reboot the specific Member switch again.
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 580a.201b.2222 1 0 V-Mismatch
3850#terminal monitor // MONITOR THE MEMBER SWITCH STATE
3850#reload slot 2
Stack is in Half ring setup; Reloading a switch might cause stack split
Proceed with reload? [confirm] // JUST HIT ENTER
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 0000.0000.0000 0 0 Removed
000156: Feb 14 04:30:46.687 UTC: %STACKMGR-1-STACK_LINK_CHANGE: 1 stack-mgr: Stack port 1 on switch 1 is up
000157: Feb 14 04:30:50.630 UTC: %STACKMGR-6-SWITCH_ADDED: 1 stack-mgr: Switch 2 has been added to the stack.
000158: Feb 14 04:31:01.271 UTC: %STACKMGR-6-SWITCH_READY: 1 stack-mgr: Switch 2 is ready.
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 580a.201b.2222 1 0 Initializing
000159: Feb 14 04:31:01.276 UTC: Starting SWITCH-ADD sequence, switch 2
000160: Feb 14 04:31:03.367 UTC: %NGWC_USB_CONSOLE-6-CONFIG_ENABLE: Switch 2: Console media-type changed to default
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 1 V03 Ready
2 Member 580a.201b.2222 1 V03 Syncing
000165: Feb 14 04:31:23.510 UTC: SWITCH-ADD sequence complete, switch 2
3850#show switch
Switch/Stack Mac Address : 580a.2006.2980 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.2980 1 V03 Ready
2 Member 580a.201b.9480 1 V03 Ready
It's also best practice to hard code the switch priority (default is 1) in order to avoid this kind of issue. I've set switch 1 with a priority of 10 (higher is better) in order to always be the Active (Master) switch in the stack.
3850#switch ?
<1-9> Switch Number
3850#switch 1 ?
priority Set the priority of the specified switch
renumber Renumber the specified switch number
stack Stack port enable or disable
3850#switch 1 priority ?
<1-15> Switch Priority
3850#switch 1 priority 10
WARNING: Changing the switchpriority may result in a configuration change for that switch. Do you want to continue?[y/n]y
3850#show switch
Switch/Stack Mac Address : 580a.2006.1111 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 580a.2006.1111 10 V03 Ready
2 Standby 580a.201b.2222 1 V03 Ready
