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How does EVE-NG compute system Mac-address of an Arista vEOS-Lab switch ( or for that matter, I assume code is uniform for other vendor's switch too , IOL-L2, Standard Switch, etc) ?
Here is the output of a vEOS-Lab instance

localhost#sh int | grep -B1 -A1 -i "Hardware is"
Ethernet1 is up, line protocol is up (connected)
Hardware is Ethernet, address is 5000.0006.0001 (bia 5000.0006.0001)
Ethernet MTU 9214 bytes
--
Ethernet2 is up, line protocol is up (connected)
Hardware is Ethernet, address is 5000.0006.0002 (bia 5000.0006.0002)
Description: leaf02
--
Ethernet3 is up, line protocol is up (connected)
Hardware is Ethernet, address is 5000.0006.0003 (bia 5000.0006.0003)
Ethernet MTU 9214 bytes
--
Management1 is up, line protocol is up (connected)
Hardware is Ethernet, address is 5000.0006.0000 (bia 5000.0006.0000)
IP MTU 1500 bytes , BW 1000000 kbit
--
Port-Channel2000 is up, line protocol is up (connected)
Hardware is Port-Channel, address is 5000.0006.0002
Ethernet MTU 9214 bytes
--
Vlan10 is up, line protocol is up (connected)
Hardware is Vlan, address is 5000.0072.8b31 (bia 5000.0072.8b31)
Internet address is 10.10.10.1/24
--
Vlan4094 is up, line protocol is up (connected)
Hardware is Vlan, address is 5000.0072.8b31 (bia 5000.0072.8b31)
Internet address is 94.0.0.0/31
localhost#sh ver
vEOS
Hardware version:
Serial number:
System MAC address: 5000.0072.8b31

Software image version: 4.22.1F-12977849.
Architecture: i686
Internal build version: 4.22.1F-12977849
Internal build ID: f43b30e8-f536-4eea-88ab-df23fdf83286

Uptime: 0 weeks, 1 days, 0 hours and 3 minutes
Total memory: 2014644 kB
Free memory: 1336700 kB

localhost#


The UUID and other details in the image attached.

MAC 5000.0006.0001

0006 is node ID
0001 is port
rest I dont know about such vlan svi's mate

looks like veos it generate it self

Vlan10 is down, line protocol is lowerlayerdown (notconnect)
Hardware is Vlan, address is 500a.0090.a115 (bia 500a.0090.a115)
Internet address is 10.1.1.1/24