CRS125 - VLANs with Trunks...

RouterOS Beginner Basics
1

Hello Everybody

I hope this section is the right one but basically I have a issue with a very Basic Configuration on my (currently) two CRS125 “Switches” if I enable all Ports of my Switch Trunk…
Mikrotik itself has a Setup Example here: https://wiki.mikrotik.com/wiki/Manual:CRS1xx/2xx_VLANs_with_Trunks
Thats exactly what I need but as soon as I enable both Ethernet Interfaces of the Trunk the VLANs are not working anymore between the Switches and I tried already a lot of things :-/
In the attached Files you also see the related parts of my 2 Switch configs… They are named switchA and swtichB and are supposed to be Switch A and B from the Mikrotik Wiki :wink:

Usually I think I do something wrong but I cant find the reason why my Switch Trunks are not working…
If I enable only ether1 OR ether2 from my Trunk everything works perfectly fine.
Also the Bonding Interface on the Router works perfectly fine if only on Ethernet Port of the Switch Trunk is enabled to the Router (I use the RB2011) so my setup is pure Mikrotik and everything is on the latest RouterOS Version 6.44.3 and the CRS Bridge Ports are Hardware Offloaded.
If I enable both Interfaces (eth1 and eth2) sometimes I see a “probably loop…” message in the Log with the MacAddress of my VLAN interface but also all other VLANs are not working anymore between the Switches and I dont see this Log message every time I enable it - just sometimes

Here my last steps which I did after a couple of tries by myself (Setup changes, reboots, changing cables, mikrotik forum wiki google etc…) before I decided to post it here:
Updated everything to 6.44.3 (Switch A was on 6.43.something before)
Reset Configuration on both CRS via winbox - without Default config
Followed the setps from the wiki page carefully (in my opinion)
Still not working :frowning:
Finished my config with just one ethernet port enabled (current status)
Open Terminal on both CRS “export file=switchXX” see attachement :wink: - the attachements are a bit modified to the important parts of the config…


So, short form at the end… with only one Ethernet Link enabled between my two switches (and to the Router) everything works perfectly fine… as soon as I enable more interfaces of the “Switch Trunk Group” the VLANs between the Devices are not working anymore.. The VLANs on the switches itself are still working fine but no no link between the switches anymore

Please have a look at it also because after a couple of tries, Im already blind I fear :-/

Thanks a lot!!!
switchB.rsc (3.34 KB)
switchA.rsc (2.43 KB)

2

Individual trunk member ports should not be members of bridge. Only trunk device is supposed to be member of bridge (the below is “cure” for switchA, apply similar to switchB):

/interface bridge port
remove [ find interface=ether1 ]
remove [ find interface=ether2 ]
add bridge=bridge interface=Trunk-MainSwitch
3

Thanks a lot for the answer mkx

Not really sure - cant test it right now because people here need there network :wink:

I already thought about this also and tried to add the Trunk Port instead of the Ethernet Ports but the Trunk Name is not offered by the Terminal nor by the Winbox to be added to the Bridge…
What I didnt try yet is, to remove ether1 and 2 before I add the Trunk “Interface” - just tried to add the Trunk and saw that its not offert as “interface” for the Bridge…

4

Hi,

I thought already and tried it right now: even if I remove ether1 and ether2 from the Bridge first, I get no option to add the Trunk as a Interface to the Bridge :frowning: