Another thing i was looking at now was trying to add the networks to a label 
thats not on a NIC and then add the label. 


Adding the Networks works well in-fact i added 1500 of them with no issue.

Then I moved the new label to the nic and watched as it begin to add the 
interfaces, i watched it and saw that it got to about 300 Interfaces before the 
UI Timed out with the error:

Operation Cancelled
Error while executing action HostSetupNetworks: Network error during 
communication with the Host.


In the Engine The Log looks like this - since there were so many networks in 
the message to add them i truncated that section - they are all the same 
settings on each network



2019-02-06 21:34:43,932+01 ERROR 
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default 
task-25) [c12f3f58-ef87-4a82-9248-e79d4c625edc] EVENT_ID: 
VDS_BROKER_COMMAND_FAILURE(10,802), VDSM u90c10aio01.cisco.com command 
HostSetupNetworksVDS failed: Message timeout which can be caused by 
communication issues
2019-02-06 21:34:43,939+01 ERROR 
[org.ovirt.engine.core.vdsbroker.vdsbroker.HostSetupNetworksVDSCommand] 
(default task-25) [c12f3f58-ef87-4a82-9248-e79d4c625edc] Command 
'HostSetupNetworksVDSCommand(HostName = u90c10aio01.cisco.com, 
HostSetupNetworksVdsCommandParameters:{hostId='509f5298-00df-4f74-9a2b-c95836442e60',
 vds='Host[u90c10aio01.cisco.com,509f5298-00df-4f74-9a2b-c95836442e60]', 
rollbackOnFailure='true', connectivityTimeout='120', 
networks='[HostNetwork:{defaultRoute='false', bonding='false', 
networkName='u90aio001-1502', vdsmName='u90aio001-1502', nicName='eno1', 
vlan='1502', vmNetwork='true', stp='false', properties='null', 
ipv4BootProtocol='NONE', ipv4Address='null', ipv4Netmask='null', 
ipv4Gateway='null', ipv6BootProtocol='NONE', ipv6Address='null', 
ipv6Prefix='null', ipv6Gateway='null', nameServers='null'}, 
HostNetwork:{defaultRoute='false', bonding='false', 
networkName='u90aio001-1503', vdsmName='u90aio001-1503', nicName='eno1', 
vlan='1503', vmNetwork='true', stp='fals
 e', properties='null', ipv4BootProtocol='NONE', ipv4Address='null', 
ipv4Netmask='null', ipv4Gateway='null', ipv6BootProtocol='NONE', 
ipv6Address='null', ipv6Prefix='null', ipv6Gateway='null', nameServers='null'}, 
HostNetwork:{defaultRoute='false', bonding='false', 
networkName='u90aio001-1504', vdsmName='u90aio001-1504', nicName='eno1', 
vlan='1504', vmNetwork='true', stp='false', properties='null', 
ipv4BootProtocol='NONE', ipv4Address='null', ipv4Netmask='null', 
ipv4Gateway='null', ipv6BootProtocol='NONE', 

..truncated...

ipv6Prefix='null', ipv6Gateway='null', nameServers='null'}, 
HostNetwork:{defaultRoute='false', bonding='false', 
networkName='u90aio001-2998', vdsmName='u90aio001-2998', nicName='eno1', 
vlan='2998', vmNetwork='true', stp='false', properties='null', 
ipv4BootProtocol='NONE', ipv4Address='null', ipv4Netmask='null', 
ipv4Gateway='null', ipv6BootProtocol='NONE', ipv6Address='null', 
ipv6Prefix='null', ipv6Gateway='null', nameServers='null'}, 
HostNetwork:{defaultRoute='false', bonding='false', 
networkName='u90aio001-2999', vdsmName='u90aio001-2999', nicName='eno1', 
vlan='2999', vmNetwork='true', stp='false', properties='null', 
ipv4BootProtocol='NONE', ipv4Address='null', ipv4Netmask='null', 
ipv4Gateway='null', ipv6BootProtocol='NONE', ipv6Address='null', 
ipv6Prefix='null', ipv6Gateway='null', nameServers='null'}, 
HostNetwork:{defaultRoute='false', bonding='false', 
networkName='u90aio001-3000', vdsmName='u90aio001-3000', nicName='eno1', 
vlan='3000', vmNetwork='true', stp='false', properties='n
 ull', ipv4BootProtocol='NONE', ipv4Address='null', ipv4Netmask='null', 
ipv4Gateway='null', ipv6BootProtocol='NONE', ipv6Address='null', 
ipv6Prefix='null', ipv6Gateway='null', nameServers='null'}]', 
removedNetworks='[]', bonds='[]', removedBonds='[]', 
clusterSwitchType='LEGACY'})' execution failed: VDSGenericException: 
VDSNetworkException: Message timeout which can be caused by communication issues
2019-02-06 21:34:43,942+01 ERROR 
[org.ovirt.engine.core.vdsbroker.vdsbroker.HostSetupNetworksVDSCommand] 
(default task-25) [c12f3f58-ef87-4a82-9248-e79d4c625edc] Error: 
VDSGenericException: VDSNetworkException: Message timeout which can be caused 
by communication issues
2019-02-06 21:34:43,942+01 ERROR 
[org.ovirt.engine.core.bll.network.host.HostSetupNetworksCommand] (default 
task-25) [c12f3f58-ef87-4a82-9248-e79d4c625edc] Command 
'org.ovirt.engine.core.bll.network.host.HostSetupNetworksCommand' failed: 
EngineException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSNetworkException: 
VDSGenericException: VDSNetworkException: Message timeout which can be caused 
by communication issues (Failed with error VDS_NETWORK_ERROR and code 5022)
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