Problem with untagged traffic.

RouterOS Beginner Basics
1

Hi!

I have a m750 configured to pass VLANs from et1 to et2 on a bridge on this fashion:

Interfaces:
ether1 -
VLAN10-eth1
VLAN20-eth1

ether2
VLAN10-eth2
VLAN20-eth2

Bridge interfaces:
bridge-v10
bridge-v20

Bridge ports:
VLAN10-eth1 → bridge-v10
VLAN10-eth2 → bridge-v10

VLAN20-eth1 → bridge-v20
VLAN20-eth2 → bridge-v20

Everything is working fine, however I cant bridge the untagged traffic to ETH2 which is at this point very necessary.

If I bridge both interfaces (ETH1 and ETH2) the VLAN 10 & 20 stops working.

Also if I try to create VLAN1 attached to ETH1 and ETH2 using the same bridging method as mentioned above it doesn’t works..

Could anyone please help me and tell me what I’m doing wrong?

Thanks!

750UP only as switch
2

You have over complicated this. DO NOT BRIDGE ANY OF THEM.

Under ETH2 Interface set its master port to ETH1. Now ETH1 and ETH2 will be on the same switch. ALSO you don’t need to have the VLAN interfaces on ETH2 anymore, the interfaces on VLAN 1 will take care of it all in this configuration.

3

Thanks for your answer tws101.

I tried setting eth2 master port to eth1 after removing all bridge interfaces and vlans from it, but it gives me the following error:

“Couldn’t change interface - chosen master-port does not support this feature (6)”

4

Ah you have one of those RB that wont do it on port 1…

Use port one for WAN only… Use port 2 and 3 for what your attempting and it will work.

That is a hardware limitation on a few boards.

5

Thank you so much! It works now!