VXLAN failed to prepare cluster domain-xxx

I ran into this issue last week.  I was preparing a new cluster for VXLAN and failed to open the firewalls to the vib could be pushed out to the ESXi hosts.  This caused the prepare for network vitalization to fail.  When I tried to remove it everything looked ok until I prepared again… this threw the following error:

domain-cxx already has been configured with a mapping.

This is a big problem and threw me for a loop.  VMware support was able to help… and I suggest unless you don’t care about your cluster or vShield implementation that you call them to solve it… but here is the fix I have used many times to resolve this issue:

Login to a vCloud cell (or download curl to your pc)

Run the following command:

curl -i -k -H "Content-type: application/xml" -u admin:default -X DELETE https://<vsm-ip>/api/2.0/vdn/map/cluster/<domain-cXXX>/switches/dvs

Replace the admin:default with your username:password for vShield and the vsm-ip with your vShield IP address.  Replace domain-cXXX with the domain name from the error.  Remove all < and > they are just to show where I placed the variables.  Now your ready for a prepare again.

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