title: Azure vnet non-transitive routing and NVA
body: <p>As many have asked before, we have a problem with spoke-vnet &lt;-&gt; hub/checkpoint-vnet &lt;-&gt; expressroute-vnet. Spokes can see all routes from hub, hub can see all routes from spoke and expressroute, but expressroute cannot see spoke-routes, and obviously cant return traffic to the spoke. I see that NVA in the hub is mentioned as a workaround for this non-transitive attribute, but how? We have a checkpoint-nva there, but i dont see how to create the routes to get around this. (the reason the expressroute is in its own vnet is a managability-issue, as they are slow to be re-provisioned if we have to rebuild the checkpoint-vnet).</p>
  <p>The problem right now is that the Expressroute gateway cannot see the spoke-routes, and so the traffic loops between onprem and er-gw. Cant seem to force this route into the er-gw with UDR.</p>