I was wondering if anyone had success with simple QinQ setups using CRS switches? When I say simple, I do not mean 802.1ad Q-in-Q implementation using Service and Customer tags, but simply double 802.1q tagging (two TPID=0x8100 headers). So the example demonstrated in MT wiki doesn't fit in this case.
Basically I have three tagged vlan's arriving on sfp1 interface (say 1001, 1002 and 1003). 1001 and 1002 need to pass remaining tagged 1001&1002 to ports ether2 and ether4 (this is done quite simply and works great), while VLAN 1003 carries multiple vlan's inside that I'd rather not configure on CRS itself, but just let it pass transparently having outer tag (1003) stripped while leaving port ether6, so I don't need to configure double tagging on router connected to this port.
Currently I have such setup using software bridge:
/interface ethernet set [ find default-name=ether2 ] master-port=sfp1 set [ find default-name=ether4 ] master-port=sfp1 /interface vlan add interface=sfp1 name=vlan_1003 vlan-id=1003 /interface bridge add disabled=no name=bridge1 protocol-mode=none /interface bridge port add bridge=bridge1 interface=vlan_1003 add bridge=bridge1 interface=ether6