Does not seem to work?
BusyBox v1.36.0 (2025-03-17 07:03:36 UTC) built-in shell (ash)
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Teltonika TSW2 series 2025
Device: TSW212
Kernel: 5.10.233
Firmware: TSW2_R_00.01.05
Build: a6ff88df
Build date: 2025-03-17 08:10:29
root@TSW212:~# ip -d l show | grep mtu
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 promiscuity 0 minmtu 0 maxmtu 0 addrgenmode eui64 numtxqueues 1 gso_max_size 65536 gso_max_segs 65535
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1504 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e3 brd ff:ff:ff:ff:ff:ff promiscuity 11 minmtu 60 maxmtu 1536 addrgenmode eui64 numtxqueues 2 gso_max_size 65536 gso_max_segs 65535
3: port1@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e4 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
4: port2@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e5 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
5: port3@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e6 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
6: port4@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e7 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
7: port5@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e8 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
8: port6@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e9 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
9: port7@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:ea brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
10: port8@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:eb brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
11: sfp1@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:ec brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
12: sfp2@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:ed brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
13: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e3 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 65535
14: br0.1@br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 20:97:27:3c:48:e3 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 0 maxmtu 65535
root@TSW212:~# ip -d l show | grep maxmtu
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 promiscuity 0 minmtu 0 maxmtu 0 addrgenmode eui64 numtxqueues 1 gso_max_size 65536 gso_max_segs 65535
link/ether 20:97:27:3c:48:e3 brd ff:ff:ff:ff:ff:ff promiscuity 11 minmtu 60 maxmtu 1536 addrgenmode eui64 numtxqueues 2 gso_max_size 65536 gso_max_segs 65535
link/ether 20:97:27:3c:48:e4 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:e5 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:e6 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:e7 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:e8 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:e9 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:ea brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:eb brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:ec brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:ed brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 1500
link/ether 20:97:27:3c:48:e3 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 65535
link/ether 20:97:27:3c:48:e3 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 0 maxmtu 65535
root@TSW212:~#