Using firmware version v5.3.3 there is no way to set management VLAN using a browser, but it can be easily set using SSH in a couple of steps as described below.
This blog post is now obsolete.
Edit rc.poststart script:
# vi /etc/persistent/rc.poststart
For example to set IP address 10.1.2.3 on vlan 123 and remove general IP address set in browser you can use such commands:
vconfig add br0 123 ifconfig br0.123 10.1.2.3 netmask 255.255.255.0 up ifconfig br0 0.0.0.0
Make rc.poststart file executable and check changes:
XM.v5.3.3# chmod +x /etc/persistent/rc.poststart XM.v5.3.3# /etc/persistent/rc.poststart
Store changes to flash if everything works as expected:
XM.v5.3.3# cfgmtd -w -p /etc/ Found Backup1 on[1] ... Found Active on[2] ... Storing Active[1] ... [%100] Active->Backup[2] ... [%100]
Reboot device:
XM.v5.3.3# reboot
ifconfig output:
XM.v5.3.3# ifconfig
ath0 Link encap:Ethernet HWaddr 00:27:22:11:11:11
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:381 errors:0 dropped:0 overruns:0 frame:0
TX packets:2299 errors:0 dropped:62 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:47931 (46.8 KiB) TX bytes:222735 (217.5 KiB)
br0 Link encap:Ethernet HWaddr 00:27:22:11:11:11
UP BROADCAST RUNNING ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:2086 errors:0 dropped:0 overruns:0 frame:0
TX packets:181 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:209570 (204.6 KiB) TX bytes:69112 (67.4 KiB)
br0.101 Link encap:Ethernet HWaddr 00:27:22:11:11:11
inet addr:10.1.2.3 Bcast:10.1.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:201 errors:0 dropped:0 overruns:0 frame:0
TX packets:181 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:23315 (22.7 KiB) TX bytes:69112 (67.4 KiB)
eth0 Link encap:Ethernet HWaddr 00:27:22:22:22:22
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:2586 errors:0 dropped:0 overruns:0 frame:0
TX packets:563 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:295818 (288.8 KiB) TX bytes:116621 (113.8 KiB)
eth1 Link encap:Ethernet HWaddr 02:27:22:22:22:22
UP BROADCAST PROMISC ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wifi0 Link encap:Ethernet HWaddr 00:27:22:11:11:11
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:48 Memory:b0000000-b0010000
Update
Since AirOS 5.5 everything can be done using browser.