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Bridge Forwarding BPDU (STP) Spanning Tree in Cluster Problem

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I got two proxmox machines working together in a cluster. They are currently connected to a switch, which has an uplink to router that monitors for redundant ports using the Spanning Tree Algorithm.

Problem is, if I reboot one of my proxmox machines, when it boots up, it sends out a bridge forwarding packet that goes all the way up through the switch and into the router. The router sees this and then promptly shuts down that port for a short period of time.

Question is, why are my two proxmox machines sending these packets out? Is there anyway to stop this from happening? Do you think the issue would be resolved if I moved one of the proxmox machines from behind the switch to a different port on the router?

Any help is appreciated!

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