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Description of problem: Boot the guest with multiple tap devices which contains at least a virtio tap device, and then ifdown one NIC card will cause another NIC card down as well. Version-Release number of selected component (if applicable): 105-4.3 How reproducible: Everytime Steps to Reproduce: 1. boot the guest with two NIC devices which contains a virtio NIC card 2. after the guest booted up, ifdown one NIC card 3. another NIC devices is down as well which means the network broken Actual results: Both tap devices down if only ifdown one of them in guest Expected results: The other tap device should survive after ifdown one Additional info: Reference bug #505232 comment #6
What's the qemu cmdline? It is weird that the tap state was changed.
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(In reply to comment #1) > What's the qemu cmdline? It is weird that the tap state was changed. Hi Dor, Sorry for the late reply. As referred in this bug description, the FULL command line could be found in bug #505232, and I also would paste it here: #/usr/libexec/qemu-kvm -name 'vm1' -drive file=/tmp/kvm_autotest_root/images/RHEL-Server-5.3-64-virtio.qcow2,media=disk,if=virtio,cache=off,boot=on -uuid 4b66fdbe-b86d-42f3-8efd-76db26aaedb6 -net nic,vlan=0,macaddr=00:11:22:33:aa:bc,model=virtio -net tap,vlan=0,ifname=test1,script=/etc/qemu-ifup-switch,downscript=no -net nic,vlan=1,macaddr=00:cc:22:33:aa:bc,model=e1000 -net tap,vlan=1,ifname=test2,script=/etc/qemu-ifup-switch,downscript=no -net nic,vlan=2,macaddr=00:11:22:33:aa:be,model=rtl8139 -net tap,vlan=2,ifname=test3,script=/etc/qemu-ifup-switch,downscript=no -m 2048 -smp 2 -vnc :0 Seems this problem still exists but I'm not sure. Yeah it's weird and important for keep guest's network stable I think. Do you think we need to reopen it?
Are you running STP on the bridge? It might be the cause. We use stp off by default.