Stacking CRS

RouterOS Beginner Basics
1

Hi,

I’d like to put one CRS behind another CRS mostly for testing stuff.

The first CRS got an yet unused public address range (/29) on the uplink port so I’d like to use this on the 2nd CRS.

Here’s an example
Uplink (/29 subnet 78.xx.xx.xx/29) → CRS → CRS2

How do I set this up on the 2nd CRS and will I also have to add that subnet in the first CRS’s ip > address section?

2

You will need to add a transit subnet between the two CRS switches - it can be public or private - both will route the public /29 properly to the internet.

So something like 100.64.0.0/30 to connect the CRS switches

And then you will need to add the /29 on the second CRS with a default route pointing towards the 1st CRS.

That’s pretty much it!