Switch

Hardware MikroTik hardware general
1

I wanted to set up a RB750 to just be a layer two switch. I want one trunking port and the other ports to tag vlan info onto any packets. First thing I did was try to mark packets coming in ether5 with vlan tag 43.

/interface ethernet switch rule add ports=ether5 new-vlan-id=43 switch=switch1

When I do this from winbox or the terminal I get an error along the lines of “failure: not supported for this switch”. I saw another post with a the same error but trying to do something else on the switch and the reply was its a bug in the OS. Is this the case for what I want to do as well or is this feature really not supported on the RB750?

VLAN using RB750
2

This feature is not supported for the switch chip RB750 have. More information: http://wiki.mikrotik.com/wiki/Switch_Chip_Features

3

Okay. Thanks. So just to make sure the RB750G will do what I want, correct?

4

I’m trying to do the same thing with an RB450G. I’ve tried adding rules to tag packets that arrive untagged at a switch port but I still can’t communicate with any devices that use the native vlan.

[admin@MikroTik] /interface ethernet switch rule> pr
Flags: X - disabled, I - invalid
0 switch=switch1 ports=ether4-local vlan-header=not-present copy-to-cpu=no redirect-to-cpu=no mirror=no new-vlan-id=134

Andrew

5

try the bonding funtion, but select 802.ad that is the link agregation standard protocol (trunking) and in the other 3 ports Im not sure if that vlan is 802.1Q

6

LACP ???

How does that apply here?

Andrew

7

go to interface - bonding - add new bonding, select at least 2 interface in slave, and in mode select 802.3ad
done, that I guess will work as trunk port, I didnt check yet in wireshire if the ethernet type is of 0x88a8

cheers

8

Yes… but the question is about vlan tagging, not port bonding.

Andrew

9

according to the wiki, the AR7240 is the chip of the RB750, and the RB750G use the same as RB450G the AR8316, both must support vlan tagging from ROS 4.x

10

Agreed. But how do I configure the switch such that packets arriving without a vlan tag get one added and packets leaving the port get the tag removed.

Andrew

11

So let me phrase this a different way:

The manual states:

new-vlan-id - if specified changes the vlan tag id, or add new vlan tag if one was not present

I want to do the opposite; i.e. if a vlan tag is present, remove it before the packet exits the switch port. Is this possible?

Regards

Andrew

12

the only way i could was using bridge

in the interface when there is more than 1 vlan (trunk) create the correspondient vlan, so create the bridge and put the vlan, and the physical interface (ether2,ether3,etc)

13

Thanks for the reply. It doesn’t look as if you can use the switch chip for this.

Andrew

14

yeap,

15

I have same problem on RB450G.
Is it hardware limitation ? Switch can do wire speed packet matching, but can’t send untagged frame ? I can’t belive it.
Is there any chance that new firmware fix this issue ?

I tried setting new-vlan-id=0 to mark that frame shoud be sent as untagged, but it doesn’t help :frowning:

16

Hi,
any news about this problem ?

I have tried to apply a vlan id (in my case id 1) to any traffic that are incoming in a eth without any tag

i have used a Rule Table that match if vlan-header is not present and put a new-vlan-id =1

but nothing is changed ?

the enviroment is:
eth5 configured in trunk mode (all vlan send tag traffic out of this interface)
hardware is rb750g
software is ROS 4.5
anyone can help us ??