(br-)lan mtu setting neglected

Software SW help
1

TOS 3.10

Below MTU setting for LAN appears not being appplied

config interface 'lan'
	option ifname 'eth0 eth2'
	option force_link '1'
	option type 'bridge'
	option proto 'static'
	option ipv6 '0'
	option delegate '0'
	option stp '1'
	option mtu '9000'

output from ip link show br-lan/eth0/eth2 is all the same:

mtu 1500

2

the mtu for an empty (unbonded) bridge can not exceed 1500 howver the bidge automatically inherits the smallest MTU integer of its enslaved devices. Hence setting the MTU of the devices to be enslaved will adjust the bridge’s MTU (9000 for jumbo frames) once bonded.

Without enslaving the wifi cards into br-lan it is feasible to raise the mtu

Summary 
config interface 'lan'
	option ifname 'eth0 eth2'
	option mtu '9000'

config interface 'eth0'
	option mtu '9000'
	option ifname 'eth0'
	option proto 'none'

config interface 'eth2'
	option mtu '9000'
	option ifname 'eth2'
	option proto 'none'

Changing the wlan mtu appears to be prevented by a bug however Tos 3.10.3 - wifi mtu settings neglected