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VLANs and Broadcast traffic

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Hi, Hopefully someone can help me with this :) I have 2 proxmox servers one running version 2.1 and the other running 1.9. I have one interface on the server which connects to a Cisco 3560G switch which is trunked and then vlans attached to different KVM servers. All seems to work ok but after a period of time traffic entering the vlan directed to the KVM host it seems to get broadcast to all servers in the same vlan. If I reboot the KVM host all is ok again for a period of time then for no reason that I can see the traffic starts to broadcast around the VLAN again as it cant see the KVM host directly. Ive seen this happening on both my Proxmox servers which are attached to different Cisco switches on physically separate networks. Does anyone have any ideas because im getting lots of broadcast traffic for KVM's just snowballing and trying to kill off my switches :( Thanks in advance, Matt

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