[libvirt-users] how libvirt create virbr0

[露露]

libvirt
version: 3.4.0
architecture: x86_64 ubuntu16.04-server
hypervisor: kvm,qemu

when install libvirt from ubuntu distribution deb install libvirt, a virtual bridge virbr0 will be create . But when I build libvirt from souce code, how can I create a virbr0.
If I want create another virtual bridge ,How can I create and start the virtual bridge.
Thanks
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