Do you know of a way to force vdsmd to forget what it knows about the network configuration on the hypervisor host? If I synchronize or make any change through the engine the host drops off the network because of an invalid configuration pushed by some component of oVirt which creates bond1 with BRIDGE=ovirtmgmt when the bridge should be assigned to bond1.$vid If I manually edit the ifcfg files or make changes with the ip command I can restore network connectivity, but can not make any changes in engine. It's not clear how to recover from this situation without reinstalling the OS.

I've concluded that I should have manually configured the VLAN sub interface only before deploying hosted engine which activates vdsmd, then configured bonds and VLANs through engine. I believe the ovirtmgmt bridge became assigned to the bond instead of the VLAN interface because I de-selected VLAN tagging in the logical network configuration in engine, and I think most of the problems I'm having are due to my needing to manually edit the configuration files written by VDSM in order to bring the host back on the network so that it can be managed by engine.

# node 4.0.1
# yum list installed |grep ovirt
cockpit-ovirt-dashboard.noarch         0.10.5-1.0.0.el7.centos        installed 
libgovirt.x86_64                       0.3.3-1.el7_2.1                installed 
ovirt-engine-appliance.noarch          4.0-20160718.1.el7.centos      @ovirt-4.0
ovirt-engine-sdk-python.noarch         3.6.7.0-1.el7.centos           installed 
ovirt-host-deploy.noarch               1.5.1-1.el7.centos             installed 
ovirt-hosted-engine-ha.noarch          2.0.1-1.el7.centos             installed 
ovirt-hosted-engine-setup.noarch       2.0.1-1.el7.centos             installed 
ovirt-imageio-common.noarch            0.3.0-0.201606191345.git9f3d6d4.el7.centos
ovirt-imageio-daemon.noarch            0.3.0-0.201606191345.git9f3d6d4.el7.centos
ovirt-node-ng-image-update-placeholder.noarch
ovirt-release-host-node.noarch         4.0.1-1.el7                    installed 
ovirt-release40-pre.noarch             4.0.1-1                        installed 
ovirt-setup-lib.noarch                 1.0.2-1.el7.centos             installed 
ovirt-vmconsole.noarch                 1.0.3-1.el7.centos             installed 
ovirt-vmconsole-host.noarch            1.0.3-1.el7.centos             installed 

# hosted engine appliance
# yum list installed|grep ovirt
ebay-cors-filter.noarch             1.0.1-3.el7                  @centos-ovirt40-candidate
libtomcrypt.x86_64                  1.17-23.el7                  @ovirt-4.0-epel
libtommath.x86_64                   0.42.0-4.el7                 @ovirt-4.0-epel
novnc.noarch                        0.5.1-2.el7                  @centos-ovirt40-candidate
otopi.noarch                        1.5.1-1.el7.centos           @ovirt-4.0     
otopi-java.noarch                   1.5.1-1.el7.centos           @ovirt-4.0     
ovirt-engine.noarch                 4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-backend.noarch         4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-cli.noarch             3.6.8.0-1.el7.centos         @ovirt-4.0     
ovirt-engine-dashboard.noarch       1.0.0-0.2.20160610git5d210ea.el7.centos
                                                                 @ovirt-4.0     
ovirt-engine-dbscripts.noarch       4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-dwh.noarch             4.0.1-1.el7.centos           @ovirt-4.0     
ovirt-engine-dwh-setup.noarch       4.0.1-1.el7.centos           @ovirt-4.0     
ovirt-engine-extension-aaa-jdbc.noarch
                                    1.1.0-1.el7                  @ovirt-4.0     
ovirt-engine-extensions-api-impl.noarch
                                    4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-lib.noarch             4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-restapi.noarch         4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-sdk-python.noarch      3.6.7.0-1.el7.centos         @ovirt-4.0     
ovirt-engine-setup.noarch           4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-setup-base.noarch      4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-setup-plugin-ovirt-engine.noarch
                                    4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-setup-plugin-ovirt-engine-common.noarch
                                    4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-setup-plugin-vmconsole-proxy-helper.noarch
                                    4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-setup-plugin-websocket-proxy.noarch
                                    4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-tools.noarch           4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-tools-backup.noarch    4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-userportal.noarch      4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-vmconsole-proxy-helper.noarch
                                    4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-webadmin-portal.noarch 4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-websocket-proxy.noarch 4.0.1.1-1.el7.centos         @ovirt-4.0     
ovirt-engine-wildfly.x86_64         10.0.0-1.el7                 @ovirt-4.0     
ovirt-engine-wildfly-overlay.noarch 10.0.0-1.el7                 @ovirt-4.0     
ovirt-guest-agent-common.noarch     1.0.12-3.el7                 @ovirt-4.0-epel
ovirt-host-deploy.noarch            1.5.1-1.el7.centos           @ovirt-4.0     
ovirt-host-deploy-java.noarch       1.5.1-1.el7.centos           @ovirt-4.0     
ovirt-image-uploader.noarch         4.0.0-1.el7.centos           @ovirt-4.0     
ovirt-iso-uploader.noarch           4.0.0-1.el7.centos           @ovirt-4.0     
ovirt-release40.noarch              4.0.0-5                      @/ovirt-release40
ovirt-setup-lib.noarch              1.0.2-1.el7.centos           @ovirt-4.0     
ovirt-vmconsole.noarch              1.0.3-1.el7.centos           @ovirt-4.0     
ovirt-vmconsole-proxy.noarch        1.0.3-1.el7.centos           @ovirt-4.0     
patternfly1.noarch                  1.3.0-1.el7.centos           @ovirt-4.0-patternfly1-noarch-epel
python-daemon.noarch                1.6-4.el7                    @ovirt-4.0-epel
python-ovirt-engine-sdk4.x86_64     4.0.0-0.3.a3.el7.centos      @ovirt-4.0     
python-websockify.noarch            0.8.0-1.el7                  @centos-ovirt40-candidate
python2-crypto.x86_64               2.6.1-9.el7                  @ovirt-4.0-epel
python2-ecdsa.noarch                0.13-4.el7                   @ovirt-4.0-epel
spice-html5.noarch                  0.1.6-1.el7                  @ovirt-4.0-epel
vdsm-jsonrpc-java.noarch            1.2.5-1.el7.centos           @ovirt-4.0