Bridged ports, causing instability.

Hello Ivanildo,

Thank you for contacting the Sophos Community.

If you do a TCPdump on the XG on the Bridge Interface when both of the cables are connected what do you see?

What about a drop-packet-capture?

I believe STP might be an issue here.

Regards,

Your concept sounds like a issue in itself. Can you give us a network map? 

Your setup creates a loop in your network. You will need a loop prevention mechanism like spanning tree to keep the other port down. If both are up you will have ethernet frames circulating in your network and inconsistent ARP tables

Understand.

In the environment we have HPE switches, it is very likely that STP is enabled.
In the bridge mode configuration, I understood that Sophos XGS would keep ports 1 and 2 in redundancy, as if only one interface sent packets on the network, which could have NLB or interface failover.
In this case, instead of dealing with the STP of each switch, I will keep only one cable connected, in port1, connect the cable from port2 only if port1 is unavailable.

Thanks !