Hello,
I have 6 of RB411AR access points with VLANs, real SSID and VAP SSID configured. Each AP has own channel. I see all real SSIDs on each channel simultaneously (6 SSIDs with same name and on individual channel) but Virtual AP has only one visible SSID and channels are jumping from channel to channel.
So it cause problems with ethernet when connected to VirtualAP. 
Real SSID has WPA2PSK. VAP is unsecured. Each SSID are bridged with own VLAN. Then VLANs are trunked to router.
Any ideas?
WiFi configuration:
[admin@xxxxxxxxxx> interface wireless print advanced
Flags: X - disabled, R - running
0 R name=“WLAN_HOTSPOT” mtu=1500 mac-address=02:0C:42:97:58:73 arp=enabled
disable-running-check=no interface-type=virtual-AP master-interface=wlan2
ssid=“hotspot” area=“” max-station-count=2007 wds-mode=disabled
wds-default-bridge=none wds-default-cost=0 wds-cost-range=0
wds-ignore-ssid=no update-stats-interval=disabled bridge-mode=enabled
default-authentication=yes default-forwarding=yes default-ap-tx-limit=0
default-client-tx-limit=0 proprietary-extensions=post-2.9.25
wmm-support=disabled hide-ssid=no security-profile=default
1 R name=“wlan2” mtu=1500 mac-address=00:0C:42:97:29:52 arp=enabled
disable-running-check=no interface-type=Atheros AR5212
radio-name=“xxxxxxxxxx” mode=ap-bridge ssid=“Wireless” area=“”
frequency-mode=manual-txpower country=latvia antenna-gain=0
frequency=2462 band=2ghz-b/g channel-width=20mhz scan-list=default
wireless-protocol=unspecified rate-set=default
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps
supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps
basic-rates-b=1Mbps basic-rates-a/g=6Mbps max-station-count=2007
distance=indoors tx-power-mode=default noise-floor-threshold=default
nv2-noise-floor-offset=default periodic-calibration=default
periodic-calibration-interval=60 burst-time=disabled dfs-mode=none
antenna-mode=ant-a wds-mode=disabled wds-default-bridge=none
wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no
update-stats-interval=disabled bridge-mode=enabled
default-authentication=yes default-forwarding=yes default-ap-tx-limit=0
default-client-tx-limit=0 proprietary-extensions=post-2.9.25
wmm-support=disabled hide-ssid=no security-profile=pass
disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=both
compression=no allow-sharedkey=no
station-bridge-clone-mac=00:00:00:00:00:00 tdma-period-size=2
nv2-queue-count=2 nv2-qos=default nv2-cell-radius=30
nv2-security=disabled nv2-preshared-key=“” hw-retries=4 frame-lifetime=0
adaptive-noise-immunity=none hw-fragmentation-threshold=disabled
hw-protection-mode=none hw-protection-threshold=0 frequency-offset=0
rate-selection=legacy