You are correct on your assumption that ether1 of RB951 is connected to the RB750GL....still no dice!
By default the wlan1 is disabled if you factory reset with no config, so in the end I ran the following.
/interface wireless
set 0 adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=0 area="" arp=enabled band=2ghz-b/g/n basic-rates-a/g=6Mbps basic-rates-b=1Mbps bridge-mode=enabled channel-width=20/40mhz-ht-above \
compression=no country=no_country_set default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=0 default-forwarding=yes dfs-mode=none disable-running-check=no disabled=no \
disconnect-timeout=3s distance=indoors frame-lifetime=0 frequency=2412 frequency-mode=manual-txpower frequency-offset=0 hide-ssid=no ht-ampdu-priorities=0 ht-amsdu-limit=8192 ht-amsdu-threshold=8192 \
ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 ht-guard-interval=any ht-rxchains=0,1 ht-supported-mcs=\
mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,mcs-17,mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23 ht-txchains=0,1 \
hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 hw-retries=7 l2mtu=2290 mac-address=4C:5E:0C:24:C7:F3 max-station-count=2007 mode=ap-bridge mtu=1500 \
multicast-helper=default name=wlan1 noise-floor-threshold=default nv2-cell-radius=30 nv2-noise-floor-offset=default nv2-preshared-key="" nv2-qos=default nv2-queue-count=2 nv2-security=disabled \
on-fail-retry-time=100ms periodic-calibration=default periodic-calibration-interval=60 preamble-mode=both proprietary-extensions=post-2.9.25 radio-name=4C5E0C24C7F3 rate-selection=advanced rate-set=\
default scan-list=default security-profile=default ssid=Test0 station-bridge-clone-mac=00:00:00:00:00:00 supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps \
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps tdma-period-size=2 tx-power-mode=default update-stats-interval=disabled wds-cost-range=50-150 wds-default-bridge=none wds-default-cost=100 wds-ignore-ssid=\
no wds-mode=disabled wireless-protocol=any wmm-support=disabled
add area="" arp=enabled bridge-mode=enabled default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=0 default-forwarding=yes disable-running-check=no disabled=no hide-ssid=no mac-address=\
4E:5E:0C:24:C7:F3 master-interface=wlan1 max-station-count=2007 mtu=1500 multicast-helper=default name=wlan2 proprietary-extensions=post-2.9.25 security-profile=default ssid=Test1 \
update-stats-interval=disabled wds-cost-range=0 wds-default-bridge=none wds-default-cost=0 wds-ignore-ssid=no wds-mode=disabled wmm-support=disabled
add area="" arp=enabled bridge-mode=enabled default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=0 default-forwarding=yes disable-running-check=no disabled=no hide-ssid=no mac-address=\
4E:5E:0C:24:C7:F4 master-interface=wlan1 max-station-count=2007 mtu=1500 multicast-helper=default name=wlan3 proprietary-extensions=post-2.9.25 security-profile=default ssid=Test2 \
update-stats-interval=disabled wds-cost-range=0 wds-default-bridge=none wds-default-cost=0 wds-ignore-ssid=no wds-mode=disabled wmm-support=disabled
/interface vlan
add arp=enabled disabled=no interface=ether1 l2mtu=1594 mtu=1500 name=vlan100 use-service-tag=no vlan-id=100
add arp=enabled disabled=no interface=ether1 l2mtu=1594 mtu=1500 name=vlan101 use-service-tag=no vlan-id=101
/interface bridge
add admin-mac=00:00:00:00:00:00 ageing-time=5m arp=enabled auto-mac=yes disabled=no forward-delay=15s l2mtu=1598 max-message-age=20s mtu=1500 name=bridge1 priority=0x8000 protocol-mode=none \
transmit-hold-count=6
add admin-mac=00:00:00:00:00:00 ageing-time=5m arp=enabled auto-mac=yes disabled=no forward-delay=15s l2mtu=1594 max-message-age=20s mtu=1500 name=bridge100 priority=0x8000 protocol-mode=none \
transmit-hold-count=6
add admin-mac=00:00:00:00:00:00 ageing-time=5m arp=enabled auto-mac=yes disabled=no forward-delay=15s l2mtu=1594 max-message-age=20s mtu=1500 name=bridge101 priority=0x8000 protocol-mode=none \
transmit-hold-count=6
/interface bridge port
add bridge=bridge1 disabled=no edge=auto external-fdb=auto horizon=none interface=wlan1 path-cost=10 point-to-point=auto priority=0x80
add bridge=bridge1 disabled=no edge=auto external-fdb=auto horizon=none interface=ether1 path-cost=10 point-to-point=auto priority=0x80
add bridge=bridge100 disabled=no edge=auto external-fdb=auto horizon=none interface=vlan100 path-cost=10 point-to-point=auto priority=0x80
add bridge=bridge101 disabled=no edge=auto external-fdb=auto horizon=none interface=vlan101 path-cost=10 point-to-point=auto priority=0x80
add bridge=bridge100 disabled=no edge=auto external-fdb=auto horizon=none interface=wlan2 path-cost=10 point-to-point=auto priority=0x80
add bridge=bridge101 disabled=no edge=auto external-fdb=auto horizon=none interface=wlan3 path-cost=10 point-to-point=auto priority=0x80
I can connect, but don't get DHCP as expected.....I only get an address on wlan1 (SSID:test0)
If there isn't anything obviously wrong with the above config, is there a way/strategy to debug?
Regards,
zb.