10.5. Dynamically Changing a Host Physical Machine or a Network Bridge that is Attached to a Virtual NIC

This section demonstrates how to move the vNIC of a guest virtual machine from one bridge to another while the guest virtual machine is running without compromising the guest virtual machine

Prepare guest virtual machine with a configuration similar to the following:

<interface type='bridge'>
      <mac address='52:54:00:4a:c9:5e'/>
      <source bridge='virbr0'/>
      <model type='virtio'/>
</interface>

<interface type='bridge'>
      <mac address='52:54:00:4a:c9:5e'/>
      <source bridge='virbr0'/>
      <model type='virtio'/>
</interface>

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Prepare an XML file for interface update:

cat br1.xml

# cat br1.xml

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<interface type='bridge'>
      <mac address='52:54:00:4a:c9:5e'/>
      <source bridge='virbr1'/>
      <model type='virtio'/>
</interface>

<interface type='bridge'>
      <mac address='52:54:00:4a:c9:5e'/>
      <source bridge='virbr1'/>
      <model type='virtio'/>
</interface>

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Start the guest virtual machine, confirm the guest virtual machine's network functionality, and check that the guest virtual machine's vnetX is connected to the bridge you indicated.

brctl show

# brctl show
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.5254007da9f2       yes                  virbr0-nic

vnet0
virbr1          8000.525400682996       yes                  virbr1-nic

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Update the guest virtual machine's network with the new interface parameters with the following command:
```
virsh update-device test1 br1.xml
```
```
# virsh update-device test1 br1.xml 

Device updated successfully
```
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On the guest virtual machine, run service network restart. The guest virtual machine gets a new IP address for virbr1. Check the guest virtual machine's vnet0 is connected to the new bridge(virbr1)
```
brctl show
```
```
# brctl show
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.5254007da9f2       yes             virbr0-nic
virbr1          8000.525400682996       yes             virbr1-nic     vnet0
```
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10.5. Dynamically Changing a Host Physical Machine or a Network Bridge that is Attached to a Virtual NIC

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