I did get a response back from Cisco TAC over the weekend, where it looks like there is an more expense way of providing some HA capability. "In regards to the vMX100 specifically, there is no formal HA support within the product itself. There are a few different ways that you can accomplish a HA-type deployment using routing and other capabilities within Azure, but but's not a classic HA deployment like we have with physical MX appliances (or ASAs). The vMX100's are fairly limited in their capabilities and for the most part limited to one-arm VPN Concentrator type deployments. From a licensing perspective, if you were to deploy two vMX100's in Azure, regardless of how you set them up, you would pay for each vMX100 license. We do not offer any HA licensing model for two vMX100's, each vMX100 spun up and deployed is licensed separately" Active/ Active only not Warm Standby and I would need to licence both MX's. Thanks for you help.
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