title: Cloud Router transitive routes (Hub-Spoke model)
body: <p>I got a situation where I hold two projects under a GCP account and want to connect my on premises infrastructure using VPN &amp; BGP. 
  One thing I can't get working and sure if supported are transitive routes. </p>
  
  <p>so as the diagram below, I want project B routes to got to project A and then being advertised to my on premises router. </p>
  
  <pre><code>    +---------------+
      |               |
      |  Cloud Router +------------------------------------+
      |               |                                    |
      |  Project A    |                                    |
      |  10.0.0.0/24  |                                    |
      |               |                                    ^
      +---------------+                    +----------------------------------+
              ^                            |                                  |
              |                            |                                  |
              |                            |   On premises router / firewall  |
              |                            |                                  |
              |                            |                                  |
              |                            +----------------------------------+
              |                                          Desired state:
      +--------------+                                   10.0.0.0/24 &amp; 10.0.1.0/24
      |  Project B   |                                   via project A cloud router
      |  10.0.1.0/24 |
      +--------------+                                   Actual state:
                                                         Only 10.0.0.0/24 is being
                                                         advertised via BGP
  </code></pre>
  
  <p>Can this be done in GCP or should I have a full manual mesh setup (or use some 3rd party software router ( vyatta / pfsense / whatever ) to accomplish this? </p>
  
  <p>Thanks. 
  Tal. </p>