Hi!

I have two Mikrotik routerboards MT750GL (5 port) with routerOS 5.6. I am trying to pass trunk (vlan10 and vlan11) between two Mikrotik routerboards MT750GL.

To better explain what I'm trying to achieve, i've configured my two Cisco switches for the exact task. Is there anyone who could write this configuration for MT RouterOS? Thanks!

Why are you trying to use routers to do the work of switches? RouterBOARDs make rather poor switches. Use one router with the following configuration:
And connect ether1 to a Cisco switch port configured as a trunk. The router will route between VLANs on a stick and do what it's good at, and the Cisco switch will switch traffic, doing what it's good at. If you don't want to use a Cisco switch you can use an RB250GS, which is also a switch. I definitely wouldn't use two routers. You'd have to bridge things in software, which is just ugly.

1. By using MikroTik bridging - it is simple, but the trunk must not have a native vlan - all should be tagged. And - the worst part - it consumes CPU and the bandwidth will be low - wasting the gigabit ports. Then:

/interface vlan add name=ether1vlan10 interface=ether1 vlan-id=10
/interface bridge add name=vlan10
/interface bridge port add bridge=vlan10 interface=ether1vlan10
/interface bridge port add bridge=vlan10 interface=ether2
/interface vlan add name=ether1vlan11 interface=ether1 vlan-id=11
/interface bridge add name=vlan11
/interface bridge port add bridge=vlan10 interface=ether1vlan11
/interface bridge port add bridge=vlan10 interface=ether3
/ip address add address=192.168.10.10/24 interface=vlan10
/ip route add gateway=192.168.10.254

The only difference is that both vlans are tagged on the trunk link.

2. I wish I had a 750GL to play with... See http://wiki.mikrotik.com/wiki/Manual:Sw ... p_Features - I think that Atheros8327 switch chip in 750GL is better than 8316 - and will allow you to do everything... And using it - you could have the trunk working without using CPU (with wire speed) . See the example on wiki - and if You would like to have a native vlan on the trunk link - you should modify it a bit (not to tag certain frames).
Having a router IP configured in the vlan could be more problematic (setting copy-to-cpu in proper "rules", I think...) - so I can't help with this without having a playground to test . But I think it would be the best solution when configured properly.

If you don't want to use a Cisco switch you can use an RB250GS, which is also a switch. I definitely wouldn't use two routers. You'd have to bridge things in software, which is just ugly.

I think that's why MikroTik makes routerboards with those funny switching chips - not to bridge in software, and not to need another device .

Thanks for your comments. I totally agree with you both, everyone should use dedicated switch instead of MT RB for such task. I just wanted to know, if MT RB could be used for such tasks, where data TX/RX rates are not high and simple VLAN solution needed.

dasiu, i tried your suggested solution and it works like a charm! Although I found a slight typo in your sample code (as far as I understand).

/interface bridge port add bridge=vlan10 interface=ether1vlan11
/interface bridge port add bridge=vlan10 interface=ether3

Interfaces "ether1vlan11" and "ether3" should have been added to bridge "vlan11".

Thanks!

dasiu, i tried your suggested solution and it works like a charm! Although I found a slight typo in your sample code (as far as I understand).

Yeah, exactly - your understanding is absolutely correct! I just went easy and copy-pasted the vlan10 and changed interface - but forgot to change this (yeah, it was late night) .
And thx for my first karma .
And I DON'T agree, that everyone should use dedicated switch, when MikroTik puts those switching Atheros 8316 and 8327 chipsets. They allow you to switch and translate many vlans without using CPU - so that you don't need a separate switch . Only software bridging is bad (and slowing down the RB).

And yet he's bridging in software now.

Use the switch chip when it works for you, sure. It's just severely limited in what it can do with VLANs. For an example, see: http://forum.mikrotik.com/viewtopic.php?f=17&t=45721

OK, So how do I enable the 750 to use the switch chip? I have a Cisco 1811 router that has Fa2 trunked to a MT750. The Vlan interfaces are assigned on the 1811 and Phy interfaces on the MT750 are assigned to the correct vlan. I can't pass any tagged traffic from traffic between the 750 and 1811.

Any ideas?

Do it simple. Make a bridge. If MTU is big enough. its like. whats goes in, goes out.

https://wiki.mikrotik.com/wiki/Manual:C ... AN_Routing

This link is to a post that looks like you can do what you want with a rule that tags inbound traffic if it isn't tagged...

1. By using MikroTik bridging - it is simple, but the trunk must not have a native vlan - all should be tagged. And - the worst part - it consumes CPU and the bandwidth will be low - wasting the gigabit ports. Then:

/interface vlan add name=ether1vlan10 interface=ether1 vlan-id=10
/interface bridge add name=vlan10
/interface bridge port add bridge=vlan10 interface=ether1vlan10
/interface bridge port add bridge=vlan10 interface=ether2
/interface vlan add name=ether1vlan11 interface=ether1 vlan-id=11
/interface bridge add name=vlan11
/interface bridge port add bridge=vlan10 interface=ether1vlan11
/interface bridge port add bridge=vlan10 interface=ether3
/ip address add address=192.168.10.10/24 interface=vlan10
/ip route add gateway=192.168.10.254

The only difference is that both vlans are tagged on the trunk link.

2. I wish I had a 750GL to play with... See http://wiki.mikrotik.com/wiki/Manual:Sw ... p_Features - I think that Atheros8327 switch chip in 750GL is better than 8316 - and will allow you to do everything... And using it - you could have the trunk working without using CPU (with wire speed) . See the example on wiki - and if You would like to have a native vlan on the trunk link - you should modify it a bit (not to tag certain frames).
Having a router IP configured in the vlan could be more problematic (setting copy-to-cpu in proper "rules", I think...) - so I can't help with this without having a playground to test . But I think it would be the best solution when configured properly.

If you don't want to use a Cisco switch you can use an RB250GS, which is also a switch. I definitely wouldn't use two routers. You'd have to bridge things in software, which is just ugly.

I think that's why MikroTik makes routerboards with those funny switching chips - not to bridge in software, and not to need another device .

Hi and sorry for revoking such a old post. I am also stuck with the almost same issue. I have CCR1036 on Point A where I am having 100 Mbps bandwidth, to add more bandwidth to CCR1036 we got another 50 Mbps on Point B. We have RB750GL on Point B. I want to use its 2 physical ports, one for sending back the 50 Mbps to CCR1036 and the other port to receive required bandwidth from CCR1036 via VLAN.

Now if i create 2 vlans in CCR1036 under 1 physical network which is connected to RB750GL via PtP link, then how to merge those 2 ports together ? Should I need to configure the Bridge ? Or can I use the Switch option in ROS and go for Port Based Vlan ?

If you are thinking that why 2 ports at RB750GL, then let me tell you that Port 1 is already connected and serving the clients at Point B, now as we got extra BW there so it is plugged into Port 2, which is now required to transfer the bandwidth to Core Router.