Omnia, kernel 5.15: All switch ports use the same CPU port
Turris OS 6.0, HBL:
# ip link
...
7: lan0@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether d8:58:d7:01:19:69 brd ff:ff:ff:ff:ff:ff
8: lan1@eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master switch state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether d8:58:d7:01:19:69 brd ff:ff:ff:ff:ff:ff
9: lan2@eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master switch state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether d8:58:d7:01:19:69 brd ff:ff:ff:ff:ff:ff
10: lan3@eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master switch state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether d8:58:d7:01:19:69 brd ff:ff:ff:ff:ff:ff
11: lan4@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master switch state UP mode DEFAULT group default qlen 1000
link/ether d8:58:d7:01:19:69 brd ff:ff:ff:ff:ff:ff
...
# uname -a
Linux omnia 5.15.59 #0 SMP Thu Aug 11 11:58:26 2022 armv7l GNU/Linux