This is a quick guide on how to upgrade Arista switches, you need to have a support contract with Arista to donwload their latest version of software.
Confirm the actual version
Arista DCS-7504N
Hardware version: 12.00
Serial number: HSH18100113
System MAC address: 2899.3a61.db81Software image version: 4.19.8M
Architecture: i386
Internal build version: 4.19.8M-8840164.4198M
Internal build ID: c419af27-06da-4a41-b1c3-567309a30adeUptime: 19 hours and 46 minutes
Total memory: 31583780 kB
Free memory: 28199196 kB
Entering in bash mode
ARISTA-7504-01(s1)#bash
Arista Networks EOS shell
[admin@ARISTA-7504-01 ~]$ scp root@10.4.252.246:EOS-4.20.8M.swi /mnt/flash/EOS-4 .20.8M.swiEOS-4.20.8M.swi
Warning: Permanently added ‘10.4.252.246’ (RSA) to the list of known hosts.
root@10.4.252.246’s password:
EOS-4.20.8M.swi 100% 596MB 85.1MB/s 00:07
Copying the firmware required, it’s possible to copy it using different methods
logout
ARISTA-7504-01(s1)#conf t
ARISTA-7504-01(s1)(config)#install source ?
certificate: Source path
extension: Source path
file: Source path
flash: Source path
ftp: Source path
http: Source path
https: Source path
scp: Source path
sftp: Source path
sslkey: Source path
terminal: Source path
tftp: Source path
After copy the firmware over, it’s time to install and reboot it
Preparing new boot-config… done.
Committing changes… done.
Reloading…Broadcast message from root@ARISTA-7504-01 (Thu Sep 13 13:28:29 2018):The system is going down for reboot NOW!
Once rebooted, the new version is ready!
ARISTA-7504-01(s1)#show version
Arista DCS-7504N
Hardware version: 12.00
Serial number: HSH18100137
System MAC address: 2899.3a61.db99
Software image version: 4.20.8M
Architecture: i386
Internal build version: 4.20.8M-9384033.4208M
Internal build ID: 5c08e74b-ab2b-49fa-bde3-ef7238e2e1ca
Uptime: 3 weeks, 4 days, 3 hours and 52 minutes
Total memory: 31579144 kB
Free memory: 28315128 kB
Doubt:
When I copy the image is not this 2GB swi file I should install in flash?
Should I rename the file to install?
copy usb1: /EOS-2GB-4.20.13.1M.swi flash: /EOS-2GB-4.20.13.1M.swi
i would leave the name as it is when you copy it.