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I am using KVM over centos7. My question is regarding networking issue that I am having in my setup.

I am using Bridge Br1: Host device vnet0 for all kvm instances. I have instance 1 and 2-5. Where 1 communicate with all 2-5 instances, the communication is full duplex. Instances 2-5 don't communicate each other. At certain point the network goes down and it takes sometime to come up again.

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I found that it was STP, that I needed to enable so that packets do not create loops. So once STP is enabled that loop is broken and system with KVM infrastructure works fine.

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