6.7

n
A port group that has the same name and is associated with another protocol profile might already
exist in the target data center, and vApps and virtual machines might be connected to this group.
Replacing the protocol profiles for the port group might affect the connectivity of these vApp and
virtual machines.
Solution
n
Create a network protocol profile on the target data center or vCenter Server system with the required
network settings and associate the protocol profile with the port group to which the vApp or virtual
machine is connected. For example, this approach is suitable if the vApp or virtual machine is a
vCenter Server extension that uses the vCenter Extension vService.
For information about providing network settings to a vApp or virtual machine from a network protocol
profile, see the vSphere Networking documentation.
n
Use the vSphere Web Client to export the OVF file of the vApp or virtual machine from the source
data center or vCenter Server system and deploy it on the target data center or vCenter Server
system.
When you use the vSphere Web Client to deploy the OVF file, the target vCenter Server system
creates the network protocol profile for the vApp.
For information about managing OVF files in the vSphere Web Client, see the vSphere Virtual
Machine Administration documentation.
Networking Configuration Operation Is Rolled Back and a
Host Is Disconnected from vCenter Server
When you attempt to add or configure networking on a vSphere Distributed Switch on a host, the
operation is rolled back and the host is disconnected from vCenter Server.
Problem
An attempt to perform a networking configuration operation on a vSphere Distributed Switch on a host,
such as creating a virtual machine adapter or a port group, causes the host to disconnect from
vCenter Server and results in the error message Transaction has rolled back on the host.
Cause
Under stressful conditions on a host, that is, if many concurrent networking operations compete for limited
resources, the time to perform some of the operations might exceed the default timeout for rollback of
network configuration operations on the distributed switch. As a result, these operations are rolled back.
For example, such a condition might come up when you create a VMkernel adapter on a host that has a
very high number of switch ports or virtual adapters, all of which consume system resources on the host.
The default timeout to roll an operation back is 30 seconds.
vSphere Networking
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