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DMF Deployment Guide - Removing an Existing OS from a Switch Print

Removing an Existing OS from a Switch

This section provides information on how to uninstall the OS from a switch.

Reverting from DMF (Switch Light OS) to EOS - 7050X3 and 7260CX3

This section details the procedure to revert the Arista 7050X and 7260X Series switch from Switch Light OS to EOS.

Procedure

To revert from SWLOS to EOS, complete the following steps:

  1. Connect to the switch via a serial connection and confirm that a SWLOS is installed. The serial console output of the switch should approximate the following example. 
    Connected to 10.240.130.2.
Escape character is '^]'.
Switch Light OS SWL-OS-DMF-8.2.0(0), 2022-03-25.05:22-fdf3fa6
Site1-F1 login:
  2. Log in to the switch via a serial connection and reboot the switch.
  3. Enter Aboot by interrupting the boot process by pressing Control-C. 
    Watchdog enabled, will fire in 2 mins
CBFS: 'Master Header Locator' located CBFS at [200:ffffc0)
CBFS: Locating 'normal/romstage'
CBFS: Found @ offset 5b3d40 size 7b7c
Aboot 9.0.3-4core-14223577
Press Control-C now to enter Aboot shell
^CWelcome to Aboot.
Aboot#
  4. Once in Aboot, change the directory to /mnt/flash. 
    Press Control-C now to enter Aboot shell
^CWelcome to Aboot.
Aboot#
Aboot# cd /mnt/flash
Aboot# pwd
/mnt/flash
Aboot#
  5. List the files under the /mnt/flash directory and check the boot-config file for current swi. 
    Aboot# pwd
/mnt/flash
Aboot# ls
AsuFastPktTransmit.log SsuRestoreLegacy.log lost+found
EOS-4.23.3M.swi aboot-chainloader.swi onl
Fossil boot-config persist
SWL-INSTALLER.swi debug schedule
SsuRestore.log fastpkttx.backup startup-config
Aboot#
Aboot# cat boot-config
SWI=flash:aboot-chainloader.swi
Aboot#
  6. Edit the boot-config file to point to the existing EOS swi under the /mnt/flash directory. 
    Aboot# vi boot-config
Aboot#
SWI=flash:aboot-chainloader.swi
~
SWI=flash:/EOS-4.23.3M.swi
~
Aboot# cat boot-config
SWI=flash:/EOS-4.23.0F.swi
  7. Reboot the switch. The switch should boot up with the EOS image. 
    Aboot# reboot
Requesting system reboot
Press Control-C now to enter Aboot shell
Booting flash:/EOS-4.23.0F.swi
[ 13.231125] Starting new kernel
starting version 219
Failed to apply ACL on /dev/kvm: Operation not supported
Welcome to Arista Networks EOS 4.23.0F

Reverting from DMF (EOS) to EOS - 7280R

This section details the procedure to revert the Arista 7280R Series switch from DMF EOS to UCN EOS.

Procedure

To revert from DMF (EOS) to UCN EOS, complete the following steps:
  1. Log in to the switch via a serial connection and reboot the switch. 
    Connected to 10.240.130.2.
Escape character is '^]'.
SAND-3 login: admin
Output to this terminal is being recorded for diagnostic purposes.
Note that only output that is visible on the console is recorded.
SAND-3>en
SAND-3#reload
! Signing certificate used to sign SWI is not signed by root certificate.
Proceed with reload? [confirm]
  2. Enter Aboot and interrupt the boot process by pressing Control-C. 
    agesawrapper_amdinitearly() returned AGESA_SUCCESS
Watchdog enabled, will fire in 2 mins
CBFS: 'Master Header Locator' located CBFS at [200:ffffc0)
CBFS: Locating 'normal/romstage'
CBFS: Found @ offset 5b3d40 size 7b7c
Aboot 9.0.3-4core-14223577
Press Control-C now to enter Aboot shell
^CWelcome to Aboot.
Aboot#
  3. Once in Aboot, change the directory to /mnt/flash. 
    Press Control-C now to enter Aboot shell
^CWelcome to Aboot.
Aboot#
Aboot# cd /mnt/flash
Aboot# pwd
/mnt/flash
Aboot#
  4. List the files under the /mnt/flash directory and check the boot-config file for current swi. 
    Aboot# pwd
/mnt/flash
Aboot# ls
AsuFastPktTransmit.log
EOS-4.25.2F.swi
EOS-4.27.2F-26021868.uppsaladmfrel-x86_64.swi
EOS-4.27.2F-26021868.uppsaladmfrel-x86_64.swi.tmp
Fossil
SsuRestore.log
SsuRestoreLegacy.log
boot-config
debug
fastpkttx.backup
x86_64
lost+found
persist
schedule
startup-config
zerotouch-config
ztn-boot-info
Aboot#
Aboot# cat boot-config
SWI=flash:/EOS-4.27.2F-26021868.uppsaladmfrel-x86_64.swi
Aboot#
  5. Remove the startup-config file and edit the boot-config file to point to the existing EOS swi under the /mnt/flash directory. 
    Aboot# rm -rf startup-config
Aboot# vi boot-config
Aboot#
SWI=flash:aboot-chainloader.swi
~
SWI=flash:/EOS-4.25.2F.swi
~
Aboot# cat boot-config
SWI=flash:/EOS-4.25.2F.swi
  6. Reboot the switch. The switch should boot up with the EOS image. 
    Aboot# reboot
Requesting system reboot
Press Control-C now to enter Aboot shell
Booting flash:/EOS-4.25.2F.swi
[ 13.231125] Starting new kernel
starting version 219
Failed to apply ACL on /dev/kvm: Operation not supported
Welcome to Arista Networks EOS 4.25.2F
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