Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

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libvirt-client-0.10.2-18.el6_4.3.x86_64

allows do define bridge forwarding networks:

# virsh net-dumpxml dev
<network>
  <name>dev</name>
  <uuid>a8785052-2a92-cbac-f066-e89c6b86300e</uuid>
  <forward mode='bridge'/>
  <bridge name='br1' />
</network>


virt-manager-0.9.0-18.el6.x86_64

doesn't allow to define such network and fails to display it when it's defined

Error selecting network: 'NoneType' object has no attribute 'split'

There is a existed bugs on RHEL6 before
https://bugzilla.redhat.com/show_bug.cgi?id=869474.
Similar reproduce steps and same error message.

Reproduce the bug on rhel with the following packages: 
#rpm -qa virt-manager libvirt
virt-manager-0.9.0-18.el6.x86_64
libvirt-0.10.2-18.el6_4.9.x86_64

#virsh net-create dev

# virsh net-dumpxml dev
<network>
  <name>dev</name>
  <uuid>a8785052-2a92-cbac-f066-e89c6b86300e</uuid>
  <forward mode='bridge'/>
  <bridge name='br1' />
</network>

Check the virtual network information in virt-manager. Open virt-manager, select one connection --> Host Details --> Virtual Networks

Select the network created by libvirt. The following error occurs.
Error selecting network: 'None Type' object has no attribute 'split'

*** This bug has been marked as a duplicate of bug 869474 ***