I have two RB4011iGS+RM here in my house, one on which floor… is it posible to connect both with a cat7 cable using SFP+ port, and configure them like it is only one device?
One will have to be the router.
If you want the other to act as a backup router use VRFF or whatever those initials stand for.
Normally one would be simple an accesss point/switch and the other the router if you had two devices.
How many wans and lans do you have??
So i should sell one RB4011iGS+RM and buy a simple mikrotik switch.
My ISP uses 3 different VLAN that i need on both ends.
Any mikrotik switch recommend to replace one of RB4011iGS+RM…?
Not suggesting you need to sell any of them, just trying to discern your requirements.
If you want to have a backup router in case one gets fried or something, then its good to have that handy.
You could use the second RB as a managed switch as well.
You could use one RB for one WAN connection and the other RB for other WAN connections both acting as routers.
It really depends on how you want to configure your network.
Typically one router, managed switch if needed somewhere in the house (since locally the 4011 has many ports) and maybe some access points for wifi distributed as needed.
As @anav wrote, sometimes it’s nice to have spare hardware handy. And if you do, it’s nice to actually use it for some other task. And you can use RB4011 as managed switch. However, due to hardware used in it and ROS limitations it is actually a fine “dumb switch” but a mediocre “managed switch” if by “managed” one thinks of “VLAN-capable” because all VLAN stuff will be done in CPU. As device’s CPU is a beast, it will do quite fine actually.
But: if you don’t care about HW redundancy and you get an opportunity to sell one RB4011 for a good price, then sell it and get yourself a good switch (should cost you quite less than RB4011 and perform better at the same time).
Back to your question: it is possible to configure the main RB4011 to take one of VLANs out of ISP’s trunk (the internet one) and use it as WAN for the whole house while passing the other VLAN s (presumably VoIP and IPTV) in the trunk connection towards the other device (the other RB4011 used as smart switch). On both devices it’s possible to pass any of those two VLANs to end devices (i.e. IP phones or TV boxes) making both RBs mostly transparent to them.
For more concrete advice you’ll have to describe your requirements and ISP setup into more details.