diff --git a/configuration/external-connectivity.rst b/configuration/external-connectivity.rst
index fe91e21..e5c709f 100644
--- a/configuration/external-connectivity.rst
+++ b/configuration/external-connectivity.rst
@@ -1,2 +1,362 @@
 External Connectivity
 =====================
+
+vRouter
+-------
+
+Overview
+^^^^^^^^
+The Trellis fabric needs to be connected to the external world via the vRouter functionality.
+In the networking industry, the term vRouter implies a "router in a VM". This is not the case in Trellis.
+
+Trellis vRouter is NOT a software router.
+Only the control plane of the router – i.e routing protocols – run in a VM.
+We use the Quagga routing protocol suite as the control plane for vRouter.
+
+The vRouter data plane is entirely in hardware - essentially the entire hardware fabric serves as the (distributed) data plane for vRouter.
+The external router views the entire network infrastructure as a single router.
+
+.. image:: ../images/config-vrouter.png
+
+.. image:: ../images/config-vrouter-external.png
+
+Physical Connectivity
+^^^^^^^^^^^^^^^^^^^^^
+External routers must be physically connected to one of the fabric leaf switches.
+Currently there is a limitation that the **external/upstream router and the Quagga instance must be connected to the same fabric leaf switch**.
+
+Therefore it is necessary to use an additional front panel port on the leaf-switch (or at least an additional vlan) to connect to the compute node hosting Quagga.
+
+.. image:: ../images/config-vrouter-physical-connection.png
+
+Configure vRouter
+^^^^^^^^^^^^^^^^^
+The operator will need to configure a subnet between the Leaf-switch, the external/upstream router and the Quagga instance.
+There are 3 IP addresses we need to allocate - 1 on the switch port, 1 in Quagga, and 1 on the upstream router.
+This means the peering subnet **cannot be smaller than a /29**.
+
+BGP peering happens between the IP addresses configured on the interfaces in Quagga and the external router.
+
+Routes are advertised by Quagga to the upstream with the next-hop set to the switch port IP address.
+This means that when traffic comes to the fabric leaf switch from outside, the switch is able to distinguish peering traffic from data traffic and treat each appropriately.
+
+The following shows an ONOS interface configuration example:
+
+.. code-block:: json
+
+	{
+	  "ports" : {
+	    "of:0000000000000001/1" : {
+	      "interfaces" : [
+	        {
+	          "name" : "upstream1",
+	          "ips"  : [ "10.0.1.2/24" ],
+	          "vlan-untagged" : 4000
+	        }
+	      ]
+	    },
+	    "of:0000000000000001/2" : {
+	      "interfaces" : [
+	          {
+	            "name" : "quagga",
+	            "ips"  : [ "10.0.1.2/24" ],
+	            "vlan-untagged" : 4000
+	          }
+	      ]
+	    }
+	  }
+	}
+
+- ``name``: An arbitrary name string for the interface. Optional.
+- ``ips``: Configure the peering subnet (10.0.1.0/24) and the switch port IP (10.0.1.2).
+  Note that we use the same IP address on both the quagga and upstream interfaces.
+- ``vlan-untagged``: Configure the same VLAN ID on both interfaces.
+  It doesn't matter exactly what the VLAN ID is, but it must be the same on both the Quagga-facing and upstream-facing interfaces.
+
+In this case the peering subnet is ``10.0.1.0/24``.
+The upstream router is using the ``10.0.1.1`` address.
+Quagga is assigned ``10.0.1.3``, which is the address used for peering.
+The upstream router needs to be configured with ``10.0.1.3`` as its BGP neighbor, and the BGP peering will be established between ``10.0.1.1`` and ``10.0.1.3``. The ``10.0.1.2`` address is used by the fabric switch and for the next-hop for routes advertised by Quagga.
+
+Of course you are not obliged to use ``10.0.1.0/24``, you should use a subnet that makes sense for your peering environment.
+
+.. note::
+	This configuration will set up an L2 link between the two fabric switch ports, over which the Quagga and external router can communicate.
+	Both Quagga and the upstream router will receive untagged packets
+	(i.e they will never see packets with vlanId 4000, which is used inside the leaf switch to establish a bridging domain).
+
+	If you need a vlan-tag in the compute node to distinguish the traffic going to Quagga, you can change the vlan assignment on the switch port "of:0000000000000001/2" to be vlan-tagged instead of vlan-untagged.
+
+Deploy the Quagga Docker Image
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Trellis uses a slightly modified version of Quagga, so the easiest way to deploy this is to use the provided docker image.
+
+.. code-block:: console
+
+	$ docker pull opencord/quagga
+
+We also need to download the **pipework** tool which will be used to connect the docker image to the physical interface that we set aside earlier.
+
+.. code-block:: console
+
+	$ wget https://raw.githubusercontent.com/jpetazzo/pipework/master/pipework
+	$ chmod +x pipework
+
+Create a directory for your Quagga configuration files, and create a bgpd.conf and zebra.conf in there.
+This folder is going to be mounted into the Quagga container.
+More on configuring Quagga later.
+
+.. code-block:: console
+
+	$ mkdir configs
+	$ touch zebra.conf bgpd.conf
+
+Now run the docker image (make sure the path the config directory matches what is on your system):
+
+.. code-block:: console
+
+	$ sudo docker run --privileged -d -v configs:/etc/quagga -n quagga opencord/quagga
+
+Finally, we can use the pipework tool to add the physical interface into the container so that Quagga can talk out over the fabric:
+
+.. code-block:: console
+
+	$ sudo ./pipework mlx1 -i eth1 quagga 10.0.1.3/24
+
+This will add host interface ``mlx1`` to the container with name ``quagga`` with interface name ``eth1`` inside the container.
+The newly added interface will have the IP ``10.0.1.3``.
+This IP address should be the peering subnet address that you want to assign to Quagga.
+
+If you need to change anything about the container (for example if you change the Quagga configuration) you can remove the original container and run a new one:
+
+.. code-block:: console
+
+	$ sudo docker rm -f quagga
+	$ sudo docker run --privileged -d -v configs:/etc/quagga -n quagga opencord/quagga
+
+Configure Quagga
+^^^^^^^^^^^^^^^^
+At this point Quagga should have IP connectivity to the external routers, and it should be able to ping them on the peering subnet.
+
+Now Quagga and the upstream routers can be configured to peer with one another.
+This configuration of Quagga is going to be highly dependent on the configuration of the upstream network, so it won't be possible to give comprehensive configuration examples here.
+It is recommended to consult the Quagga documentation for exhaustive information on Quagga's capabilities and configuration.
+Here I will attempt to provide a few basic examples of Quagga configuration to get you started.
+You'll have to enhance these with the features and functions that are needed in your network.
+
+Zebra configuration
+"""""""""""""""""""
+Regardless of which routing protocols you are using in your network,
+it is important to configure Zebra's FPM connection to send routes to the FPM app running on ONOS.
+This feature was enabled by the patch that was applied earlier when we installed Quagga.
+
+A minimal Zebra configuration might look like this:
+
+.. code-block:: text
+
+	!
+	hostname cord-zebra
+	password cord
+	!
+	fpm connection ip 10.6.0.1 port 2620
+	!
+
+The FPM connection IP address is the IP address of **one of the onos cluster instances** - does not matter which one.
+If you have other configuration that needs to go in zebra.conf you should add that here as well.
+
+BGP configuration
+"""""""""""""""""
+An example simple BGP configuration for peering with one BGP peer might look like this:
+
+.. code-block:: text
+
+	hostname bgp
+	password cord
+	!
+	ip prefix-list 1 seq 10 permit 192.168.0.0/16
+	!
+	route-map NEXTHOP permit 10
+	match ip address prefix-list 1
+	set ip next-hop 10.0.1.2
+	!
+	router bgp 65535
+	  bgp router-id 10.0.1.3
+	  !
+	  network 192.168.0.0/16
+	  !
+	  neighbor 10.0.1.1 remote-as 65540
+	  neighbor 10.0.1.1 description upstream1
+	  neighbor 10.0.1.1 route-map NEXTHOP out
+	  !
+
+This configuration peers with one upstream router ``10.0.1.1`` and advertises one route ``192.168.0.0/16``.
+Note that Quagga (and as a result Trellis) is in a different AS ``65535`` from the upstream router AS ``65540``,
+as we are using E-BGP for this connectivity.
+
+.. note::
+	Pay attention to the configuration to rewrite the next hop of routes that are advertised to the upstream router.
+	A ``route-map`` is used to set the next hop of advertised routes to ``10.0.1.2``,
+	which is **different from the address that Quagga is using to peer with the external router**.
+	As mentioned above, it is important that this rewriting is done correctly so that the fabric switch is able to **distinguish data plane and control plane** traffic.
+
+
+Route service and static route
+------------------------------
+
+Access route service via CLI
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+View routes
+"""""""""""
+This will show routes from all sources, including static and dynamic routes.
+The example below shows routes learned from the upstream router (Source: FPM) and routes configured manually (Source: STATIC)
+
+.. code-block:: text
+
+	onos> routes
+
+	B: Best route, R: Resolved route
+
+	Table: ipv4
+	B R  Network            Next Hop        Source (Node)
+	     0.0.0.0/0          172.16.0.1      FPM (127.0.0.1)
+	> *  1.1.0.0/18         10.0.1.20       STATIC
+	> *  10.0.99.0/24       10.0.1.1        FPM (127.0.0.1)
+	  *  10.0.99.0/24       10.0.6.1        FPM (127.0.0.1)
+	   Total: 2
+
+	Table: ipv6
+	B R  Network                                     Next Hop                                Source (Node)
+	> *  2000::7700/120                              fe80::288:ff:fe00:1                     FPM (127.0.0.1)
+	> *  2000::8800/120                              fe80::288:ff:fe00:2                     FPM (127.0.0.1)
+	> *  2000::9900/120                              fe80::288:ff:fe00:1                     FPM (127.0.0.1)
+	  *  2000::9900/120                              fe80::288:ff:fe00:2                     FPM (127.0.0.1)
+	   Total: 3
+
+
+Add a static route
+""""""""""""""""""
+
+.. code-block:: console
+
+	onos> route-add <prefix> <nexthop>
+	onos> route-add 1.1.0.0/18 10.0.1.20
+	onos> route-add 2020::101/120 2000::1
+
+
+Remove a static route
+"""""""""""""""""""""
+
+.. code-block:: console
+
+	onos> route-remove <prefix> <nexthop>
+	onos> route-remove 1.1.0.0/18 10.0.1.20
+
+
+Access route service via REST
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Single route
+""""""""""""
+
+.. code-block:: console
+
+	$ curl --user onos:rocks -X POST -H 'Content-Type:application/json' http://<controller-ip>:8181/onos/routeservice/routes -d@routes.json
+	$ curl --user onos:rocks -X GET -H 'Accept:application/json' http://<controller-ip>:8181/onos/routeservice/routes | python -mjson.tool
+	$ curl --user onos:rocks -X DELETE -H 'Content-Type:application/json' http://<controller-ip>:8181/onos/routeservice/routes -d@routes.json
+
+with identical json format for both POST and DELETE:
+
+.. code-block:: json
+
+	{
+	  "prefix": "20.0.0.1/24",
+	  "nextHop": "10.0.1.10"
+	}
+
+
+Bulk routes
+"""""""""""
+
+.. code-block:: console
+
+	$ curl --user onos:rocks -X POST -H 'Content-Type:application/json' http://<controller-ip>:8181/onos/routeservice/routes/bulk -d@routes.json
+	$ curl --user onos:rocks -X DELETE -H 'Content-Type:application/json' http://<controller-ip>:8181/onos/routeservice/routes/bulk -d@routes.json
+
+with identical json format for both POST and DELETE:
+
+.. code-block:: json
+
+	{
+	  "routes": [
+	    {
+	      "prefix": "20.0.0.1/24",
+	      "nextHop": "10.0.1.10"
+	    },
+	    {
+	      "prefix": "30.0.0.1/24",
+	      "nextHop": "10.0.2.15"
+	    }
+	  ]
+	}
+
+
+Verify routes
+^^^^^^^^^^^^^
+Check the leaf switches that the route (e.g. 1.1.0.0/18) has been programmed in the routing table (table 30).
+
+.. code-block:: console
+
+	onos> flows any of:0000000000000205 30
+	<snip>
+	id=670000d1f6782c, state=ADDED, bytes=0, packets=0, duration=39, liveType=UNKNOWN, priority=36010, tableId=30, appId=org.onosproject.segmentrouting, payLoad=null, selector=[ETH_TYPE:ipv4, IPV4_DST:1.1.0.0/18],
+	 treatment=DefaultTrafficTreatment{immediate=[], deferred=[GROUP:0x70000014], transition=TABLE:60, meter=None, cleared=false, metadata=null}
+	<snip>
+
+Notes about next hops
+^^^^^^^^^^^^^^^^^^^^^
+The next hop of a route should be resolvable to a MAC address that is known to ONOS.
+Typically the next hop is a server interface that is known to ONOS as a host learned via ARP or DHCP.
+If you are not sure, check the ``hosts`` command on the ONOS CLI.
+
+.. code-block:: console
+
+	onos> hosts
+	<snip>
+	id=A2:9B:32:9D:7F:B3/None, mac=A2:9B:32:9D:7F:B3, location=of:0000000000000205/48, vlan=None, ip(s)=[192.168.101.2], configured=false
+	id=B2:A4:E2:72:D1:91/None, mac=B2:A4:E2:72:D1:91, location=of:0000000000000204/16, vlan=None, ip(s)=[10.0.1.20], configured=false
+	id=EE:22:F7:BE:86:50/None, mac=EE:22:F7:BE:86:50, location=of:0000000000000205/16, vlan=None, ip(s)=[10.0.2.15], configured=false
+
+If the next hop has not been resolved for any reason, it would be necessary to configure the next hop as a host (/32 prefix) together with MAC address and location.
+Learn more about how to configure a host using `Network Config Host Provider <https://wiki.onosproject.org/display/ONOS/Network+Config+Host+Provider>`_
+
+Finally note that if you are configuring routes manually/statically and they are publicly routable IPs that should be reachable from “outside”, you would need to configure Quagga to advertise them upstream.
+
+
+Route blackhole
+---------------
+The blackhole consists of a rule on table 30 on every edge device on the fabric.
+The Table 30 rule matches on a given IP address and mask and has nothing but a clearDeferred action, practically dropping the packet.
+Every IP we want to blackhole will have it's own rule in every edge switch.
+
+An example of such rule is:
+
+.. code-block:: text
+
+	ADDED, bytes=0, packets=0, table=30, priority=48010, selector=[ETH_TYPE:ipv4, IPV4_DST:50.0.0.0/24], treatment=[transition=TABLE:60]
+
+Route blackholing can be done via network configuration.
+
+.. code-block:: json
+
+	{
+	  "apps" : {
+	    "org.onosproject.segmentrouting" : {
+	      "segmentrouting": {
+	        "blackholeIps": [
+	          "50.0.0.0/24"
+	        ]
+	      }
+	    }
+	  }
+	}