Multicast WDS Imaging Not Working - Doesn't show up when booted via PXE..?

Question

I have a lab environment setup specifically for imaging laptops via WDS.   I have a stand alone Windows 2012 server connected directly to an 8-Port Cisco SG-220 8 Port switch.    Nothing else is connected to this server and it is not being
used for anything else.  The server is running DHCP and WDS.    I can boot laptops via PXE and connect to the WDS server to deploy the images through standard WDS imaging.  However, I have not been able to get Multicasting to work.  I
have never used Multicasting before and have read through the documentation but must be missing something.  This is what I've done:
1. In the WDS server I right click on my deployment image and select 'create multicast image' then go through the prompts to create an auto-cast image.  
2. The Multicast image is created and shown as 'waiting' on the WDS server.
3. The Cisco router is brand new out of the box, the only configuration I did was to enable IGMP snooping.  I did not make any other changes to the setup of the switch.
4. I boot a target machine via PXE using the same Boot Image that I always use.  It loads to the screen where I can select the image I want to deploy but it never shows the multicast image as an option.  I only see the regular image I had previously
been using.
I'm not sure what else I'm missing in order to get the target machine to connect and image using the multicast image.  
Here are a few screen shots of what I have setup:
Here is the multicast image created on the server
Here is the Cisco Router configuration:
Here is the NIC card configuration on the server:
This is the target laptop booted via PXE but it never shows the multicast image as an option.
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Answer 1

Hi AdamNYC31,
The multicast feature used by WDS uses Internet Group Management Protocol (IGMP) version 3. Your network switches will need to support this, and you’ll need to configure them
for multicast. Please refer the following similar thread check each step Aaron Tyler and Ron St and Ankit Oberoi offered solution.
Multicast issue: Always "Waiting"
https://social.technet.microsoft.com/Forums/windowsserver/en-US/18122b39-e707-455d-b22f-956ebfb95e40/multicast-issue-always-waiting?forum=winserversetup
I’m glad to be of help to you!
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