Are there more virtual machines on this UCS that are using this VLAN you're trying to use for this CUCM? For example, a Windows server. If you have a Windows server for testing on this UCS, can you try to set the same IP address and default gateway like you're trying in the CUCM, and see if it lets you and that the networking to this machine is working fine. Maybe you have some conflicts over your virtual network on your UCS that conflicts with the settings that you're trying to put into your CUCM.
And if it's possible can you give us an output of the CLI command 'show network all' ?
Although I'm not sure you can, because you're using console and you cannot copy & paste from there, if I'm not mistaken, but screenshots will suffice I think.