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Does vCenter Server recycle VM MAC Addresses after Cross vCenter vMotion?

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I recently received a question from a customer who was concerned that after a VM has been migrated from one vCenter Server to another using Cross vCenter vMotion, that the original source VM MAC Address could potentially be recycled and re-used at a later point. Back in 2015, I actually wrote about this very topic and the concerns around VM MAC Address duplication after a Cross vCenter vMotion, which I highly encourage folks to check out if you have not seen this article already.

While re-reading the article, I realized that the article had primarily focused on vCenter Servers that were in Linked Mode or under the same vSphere Single Sign-On (SSO) domain and although I did mention the Cross vCenter vMotion across across different vSphere SSO domains scenario, it looks like the details were a tad bit light.

To quickly summarize, when a VM is migrated from a source vCenter Server to the designation vCenter Server, the VM's MAC Address is added to a MAC Address "block list" on the source vCenter Server. This ensures that the VM MAC Address will not be reallocated by the source vCenter Server which would cause a network conflict. This has been the default behavior since vSphere 6.0 and no additional configuration change is required by customers.

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Cross vCenter Workload Migration Fling v3.1

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Here is a small update to the Cross vCenter Workload Migration Fling which includes a couple of commonly requested features along with some bug fixes.

What's New in v3.1

  • Support for disk format conversion between Thick (Lazy Zeroed), Thick (Eager Zeroed) and Thin provisioning
  • Support for VM rename pattern for Clone operation
  • Fixed duplicated network selection when performing bulk migration
  • Fixed startup failure when a new home vCenter is specified as a command line argument

vSphere HTML5 and Standalone UI Client Support

In our 3.0 release, we added support for a native vSphere HTML5 (H5) Client experience which leverages new remote plugin framework that was introduced in vSphere 6.7 Update 1 and enables customers who prefer to use the H5 Client for their day to day use to also take advantage of the Cross vCenter Workload Migration Tool directly from the same UI. However, the addition of this new consumption UI created some confusion as some folks assumed this was the only mechanism. As stated in the release notes, we support both the new H5 UI as well as the standalone UI which many customers have been using for quite some time.

I suspect the confusion was due to the new CLI syntax which now requires specifying a vCenter Server endpoint to register. It is true that if you wish to use the new H5 Client integration, you will need to have a vSphere 6.7 Update 1 environment and provide credentials to that "home" vCenter Server. However, if you do not wish to use the H5 Client and you wish to use the old standalone client, you simply omit the vCenter Server registration details and the standalone client will work. In fact, even if you decide to use the H5 Client UI, you can always use the standalone client as that is the actual backend of the system.

Option 1: vSphere H5 Client Plugin

The following command will register the Cross vCenter Workload Migration Fling plugin to the specified vCenter Server:

java -jar xvm-3.1.jar --vcenter.fqdn=VCENTER-IP-OR-FQDN --vcenter.user=ADMIN-USER --vcenter.pass=ADMIN-PASSWORD

You will need to logout and then log back in to see the plugin which is located under "Menu" as shown in the screenshot below.

Option 2: Standalone UI Client

The following command will start the Cross vCenter Workload Migration Fling in standalone mode:

java -jar xvm-3.1.jar

You can then access the standalone client by opening a browser to localhost and port specified (default is 8443). You can always access the plugin locally whether you are using Option 1 or 2.

NSX-T Opaque Networks now supported with Cross vCenter Workload Migration Fling

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The Cross vCenter Workload Migration Fling continues to be an extremely powerful tool for our customers and I just love hearing successful customer stories like the one recently shared by Jason on how the tool allowed him to easily migrate over 600 Virtual Machines and with more to come!

One capability that customers have been asking for is the ability to migrate to and from an NSX-T Opaque Network type, which the current Fling does not support. This has become more and more important as the default NSX stack for VMware Cloud on AWS (VMC) is now NSX-T by default, rather than NSX-V. We are also seeing requests from on-premises customers who have deployed NSX-T for their next generation infrastructure and needing the ability to easily migrate workloads between their old infrastructure that maybe running VSS/VDS or NSX-V backed networks.

With the help from two new colleagues, Vikas Shitole and Rajmani Patel, we are excited to announce the release Cross vCenter Workload Migration v2.6 which now adds support for NSX-T Opaque Networks!

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