How to Forward Multiple Ports to Two Output Ports on MikroTik RouterOS

RouterOS Beginner Basics
1

Hello,
I am using a MikroTik CRS326-24G-2S+IN running RouterOS v6.47.10 (long-term). I can successfully forward one port to another port using the “Mirror Source” and “Mirror Target” options in the “Switch” submenu in WebFig.
However, if possible, I would like to forward multiple ports to two output ports for logging purposes. I heard it might be possible using TCAM or some specific rules settings, but I am not sure how to implement this. Could someone point me in the right directions, as I am not sure where to start looking?

Thank you!

2

I’ll have to disappoint you but I don’t think the desired setup is possible with your device even though it’s a very powerful one. The only one that will work in your scenario, to my knowledge, is the RB5009

3

Hi TheCat12,

thank you very much for your feedback. Is it because the chip used in this model can physically only handle forwarding to one port?

4

Precisely. Only the 88E6393X is capable of mirroring to multiple ports:

https://help.mikrotik.com/docs/display/ROS/Switch+Chip+Features#SwitchChipFeatures-PortMirroring

5

Thank you again for your reply and the link.
I think I read that page some time ago, must have overlooked that crucial detail.

Just one more question. Is there a way to write some forwarding rules on the CRS326-24G-2S+IN?
For example, I am expecting packets of a certain IP-Range on two ports. Could I implement two rules, that forward those directly to two given ports. Or is that only possible, if the switch chip has TCAM?

6

That should be quite achievable:

/interface ethernet switch rule
add new-dst-ports=etherx,ethery src-address=x.x.x.x ports=ethera,etherb
7

Thank you very much for your answer. I will try this and see if that’s good enough so that I don’t need to mirror all traffic.