stacking switch lose internet

[Joe_Ang]

This is probably a super basic question, but I'm at a loss why this is happening.

I have a pfsense firewall with LAN hooked up to slot 1 on my x440 g2. I want to enable redundancy so I purchased a second x440 g2, but when I plug the switch into slot 49 and 50 (ethernet connected 49-49, 50-50), I suddenly drop internet. I feel like it's trying to grab internet from the new switch rather than my firewall. Both switches are back to factory settings.

Any help would be greatly appreciated. Thank you.

[Joe_Ang]

Awesome, thanks fellas.

[Peter_Chang]

Hi Joe,

Touching on Nick's point it does sound like you are creating a loop. Eric's point sounds like it's the best way forward. You will need to configure stacking if it hasn't been done already.

Once stacking is configured, you will need to configure link aggregation on the pfsense side first, by creating and building a "LAGG" with the interfaces you are trying to utilize. Once done create your link sharing LACP ports on the switch, 1:49-50, 2:49-50.

[Joe_Ang]

Thanks, will take a look at it.

[Nick_Yakimenko]

You are creating a loop. Perhaps you need to configure LACP between 49 and 50 ports on both switches?