azure: update vnet routing/serial console

docs/installation/cloud/azure.rst

@@ -14,7 +14,7 @@ Deploy VyOS on Azure.
 
 .. figure:: /_static/images/cloud-azure-01.png
 
-3. On the marketplace search ``VyOS``
+3. On the marketplace search ``VyOS`` and choose the appropriate subscription
 
 .. figure:: /_static/images/cloud-azure-02.png
 
@@ -26,7 +26,7 @@ Deploy VyOS on Azure.
 
 .. figure:: /_static/images/cloud-azure-04.png
 
-6. Click ``Review + create``. After fiew second your deployment will be complete
+6. Click ``Review + create``. After a few seconds your deployment will be complete
 
 .. figure:: /_static/images/cloud-azure-05.png
 
@@ -51,6 +51,22 @@ instance. Attach the interface in the Azure portal and then start the instance.
 .. note:: Azure does not allow you attach interface when the instance in the
    **Running** state.
 
+Absorbing Routes
+----------------
+
+If using as a router, you will want your LAN interface to absorb some or all of the traffic from your VNET by using a route table applied to the subnet.
+
+1. Create a route table and browse to **Configuration**
+
+2. Add one or more routes for networks you want to pass through the VyOS VM. Next hop type **Virtual Appliance** with the **Next Hop Address** of the VyOS ``LAN`` interface.
+
+.. note:: If you want to create a new default route for VMs on the subnet, use **Address Prefix** ``0.0.0.0/0`` Also note that if you want to use this as a typical edge device, you'll want masquerade NAT for the ``WAN`` interface.
+
+Serial Console
+--------------
+
+Azure has a way to access the serial console of a VM, but this needs to be configured on the VyOS. It's there by default, but keep it in mind if you are replacing config.boot and rebooting: ``set system console device ttyS0 speed '9600'``
+
 References
 ----------
 https://azure.microsoft.com