MLAG issues

RouterOS Beginner Basics
1

Hello,

I am trying to set up a simple MLAG using two CRS317 switches and a Cisco (acting as a client).
I’ve followed the documentation found at https://help.mikrotik.com/docs/display/ROS/Multi-chassis+Link+Aggregation+Group but the Cisco always keeps one of the ports suspended. I tried to do the same setup using another CRS, and always, one of the ports is inactive. What am I doing wrong?

P.S. running RouterOS 7.14.3 but I don’t have access to command /interface/bridge/mlag. Mlag doesn’t seem to be a valid command under /interface/bridge…?

Thank you!

2

It seems that in x86/qemu emulated images MLAG setting under /interface/bridge is missing for whatever reason… It’s a real shame, as I really wanted to simulate this before pushing it live… :frowning:

I guess there’s no way to do this unless I run it on the hardware switches? Has anyone had any issues with MLAG between 4 RouterOS systems? I want to form two mlag-ids, one per two devices and those would link together, via LACP. Thoughts?

Something like this:

Sw01 ---- peer-link ---- Sw02
   |                      |
   |                      |
Sw03 ---- peer-link ---- Sw04

I would have MLAG between Sw01 and Sw02 with mlag-id 10, let’s say, with the peer-link the link between the two switches and members of LACP each interface going to Sw03-04 and the exact same setup on Sw03 and Sw04, with a different mlag-id

3

Yup, it works just fine. I have a CRS312 and CRS354 in my lab using MLAG with each other, talking via LACP to a pair of CRS317’s in my network core. The link between the two of them is just vanilla LACP as far as the switches are concerned.

4

@sibryan, I’ve got a question:
Due to the need of separating the two sides, from a broadcast domain perspective, I am planning to have a bridge created on each switch, with a single port in it, the port that goes to the other switch. What I mean: on sw01 I would have port 15 going to sw02 and port 10 going to sw03. Likewise for the other switches.
I want to create a bridge on sw01, add port 10 to it and use it as MLAG member. The question is: can I use port 10, which is in a different bridge, as a peer-link?

Thank you!