As described in the OpenWRT network wiki
(http://wiki.openwrt.org/doc/uci/network#options.valid.for.all.protocol.types)
common interface uci parameters can be defined like mtu/macaddr/... which
override the default interface values.
This is working fine when "old" style vlan configuration is used to override
these parameters as can be seen below
config interface 'wan'
option proto 'dhcp'
option mtu '1450'
option macaddr 'aa:bb:cc:dd:ee:ff'
option ifname 'ptm0.20'
ip link show
...
22: ptm0.20@ptm0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue
state UP mode DEFAULT group default
link/ether aa:bb:cc:dd:ee:ff brd ff:ff:ff:ff:ff:ff
..
Using the "new" device style configuration to define vlans overriding
parameters like mtu/macaddr is not working
config interface 'wan'
option proto 'dhcp'
option mtu '1450'
option macaddr 'aa:bb:cc:dd:ee:ff'
option ifname 'vlan20'
config device 'vlan20'
option type '8021q'
option ifname 'ptm0'
option name 'vlan20'
option vid '20'
ip link show
....
21: vlan20@ptm0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP mode DEFAULT group default
link/ether a4:b1:e9:47:54:54 brd ff:ff:ff:ff:ff:ff
....
However you can workaround the issue by defining mtu/macaddr in the device
section
config interface 'wan'
option proto 'dhcp'
option mtu '1450'
option macaddr 'aa:bb:cc:dd:ee:ff'
option ifname 'vlan20'
config device 'vlan20'
option type '8021q'
option ifname 'ptm0'
option name 'vlan20'
option vid '20'
option mtu '1450'
option macaddr 'aa:bb:cc:dd:ee:ff'
ip link show
...
21: vlan20@ptm0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state
UP mode DEFAULT group default
link/ether aa:bb:cc:dd:ee:ff brd ff:ff:ff:ff:ff:ff
...
Now I'm a bit puzzled if the oberved behavior (need to define mtu/macaddr in
the device section to make override work) is
expected behavior by design choice or does it need to be considered as bug ?
Looking into the netifd code devices are passed the interface config data only
when the default_config flag is set which
is not the case for the vlan devices and thus common interface parameters
cannot be overridden
Thx,
Hans
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