Configuration Blueprints: add new example for firewall+vrf. Also, add note about usage of inbound and outbound interface when interface is attached to a non-default vrf.

(cherry picked from commit fe416b56cfa30494172a0310c16fd2787330c7bb)

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#	docs/configexamples/zone-policy.rst

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diff --git a/docs/configexamples/fwall-and-vrf.rst b/docs/configexamples/fwall-and-vrf.rst
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+VRF and firewall example
+------------------------
+
+Scenario and requirements
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This example shows how to configure a VyOS router with VRFs and firewall rules.
+
+Diagram used in this example:
+
+.. image:: /_static/images/firewall-and-vrf-blueprints.png
+    :width: 80%
+    :align: center
+    :alt: Network Topology Diagram
+
+As exposed in the diagram, there are four VRFs. These VRFs are ``MGMT``,
+``WAN``, ``LAN`` and ``PROD``, and their requirements are:
+
+* VRF MGMT:
+   * Allow connections to LAN and PROD.
+   * Deny connections to internet(WAN).
+   * Allow connections to the router.
+* VRF LAN:
+   * Allow connections to PROD.
+   * Allow connections to internet(WAN).
+* VRF PROD:
+   * Only accepts connections.
+* VRF WAN:
+   * Allow connection to PROD.
+
+Configuration
+^^^^^^^^^^^^^
+
+First, we need to configure the interfaces and VRFs:
+
+.. code-block:: none
+
+  set interfaces ethernet eth1 address '10.100.100.1/24'
+  set interfaces ethernet eth1 vrf 'MGMT'
+  set interfaces ethernet eth2 vif 150 address '10.150.150.1/24'
+  set interfaces ethernet eth2 vif 150 vrf 'LAN'
+  set interfaces ethernet eth2 vif 160 address '10.160.160.1/24'
+  set interfaces ethernet eth2 vif 160 vrf 'LAN'
+  set interfaces ethernet eth2 vif 3500 address '172.16.20.1/24'
+  set interfaces ethernet eth2 vif 3500 vrf 'PROD'
+  set interfaces loopback lo
+  set interfaces pppoe pppoe0 authentication password 'p4ssw0rd'
+  set interfaces pppoe pppoe0 authentication username 'vyos'
+  set interfaces pppoe pppoe0 source-interface 'eth0'
+  set interfaces pppoe pppoe0 vrf 'WAN'
+  set vrf bind-to-all
+  set vrf name LAN protocols static route 0.0.0.0/0 interface pppoe0 vrf 'WAN'
+  set vrf name LAN protocols static route 10.100.100.0/24 interface eth1 vrf 'MGMT'
+  set vrf name LAN protocols static route 172.16.20.0/24 interface eth2.3500 vrf 'PROD'
+  set vrf name LAN table '103'
+  set vrf name MGMT protocols static route 10.150.150.0/24 interface eth2.150 vrf 'LAN'
+  set vrf name MGMT protocols static route 10.160.160.0/24 interface eth2.160 vrf 'LAN'
+  set vrf name MGMT protocols static route 172.16.20.0/24 interface eth2.3500 vrf 'PROD'
+  set vrf name MGMT table '102'
+  set vrf name PROD protocols static route 0.0.0.0/0 interface pppoe0 vrf 'WAN'
+  set vrf name PROD protocols static route 10.100.100.0/24 interface eth1 vrf 'MGMT'
+  set vrf name PROD protocols static route 10.150.150.0/24 interface eth2.150 vrf 'LAN'
+  set vrf name PROD protocols static route 10.160.160.0/24 interface eth2.160 vrf 'LAN'
+  set vrf name PROD table '104'
+  set vrf name WAN protocols static route 10.150.150.0/24 interface eth2.150 vrf 'LAN'
+  set vrf name WAN protocols static route 10.160.160.0/24 interface eth2.160 vrf 'LAN'
+  set vrf name WAN protocols static route 172.16.20.0/24 interface eth2.3500 vrf 'PROD'
+  set vrf name WAN table '101'
+
+And before firewall rules are shown, we need to pay attention how to configure
+and match interfaces and VRFs. In case where an interface is assigned to a
+non-default VRF, if we want to use inbound-interface or outbound-interface in
+firewall rules, we need to:
+
+* For **inbound-interface**: use the interface name with the VRF name, like
+  ``MGMT`` or ``LAN``.
+* For **outbound-interface**: use the interface name, like ``eth0``, ``vtun0``,
+  ``eth2*`` or similar. 
+
+Next, we need to configure the firewall rules. First we will define all rules
+for transit traffic between VRFs.
+
+.. code-block:: none
+
+  set firewall ipv4 forward filter default-action 'drop'
+  set firewall ipv4 forward filter default-log
+  set firewall ipv4 forward filter rule 10 action 'accept'
+  set firewall ipv4 forward filter rule 10 description 'MGMT - Allow to LAN and PROD'
+  set firewall ipv4 forward filter rule 10 inbound-interface name 'MGMT'
+  set firewall ipv4 forward filter rule 10 outbound-interface name 'eth2*'
+  set firewall ipv4 forward filter rule 99 action 'drop'
+  set firewall ipv4 forward filter rule 99 description 'MGMT - Drop all going to mgmt'
+  set firewall ipv4 forward filter rule 99 outbound-interface name 'eth1'
+  set firewall ipv4 forward filter rule 120 action 'accept'
+  set firewall ipv4 forward filter rule 120 description 'LAN - Allow to PROD'
+  set firewall ipv4 forward filter rule 120 inbound-interface name 'LAN'
+  set firewall ipv4 forward filter rule 120 outbound-interface name 'eth2.3500'
+  set firewall ipv4 forward filter rule 130 action 'accept'
+  set firewall ipv4 forward filter rule 130 description 'LAN - Allow internet'
+  set firewall ipv4 forward filter rule 130 inbound-interface name 'LAN'
+  set firewall ipv4 forward filter rule 130 outbound-interface name 'pppoe0'
+
+Also, we are adding global state policies, in order to allow established and
+related traffic, in order not to drop valid responses:
+
+.. code-block:: none
+
+  set firewall global-options state-policy established action 'accept'
+  set firewall global-options state-policy invalid action 'drop'
+  set firewall global-options state-policy related action 'accept'
+
+And finally, we need to allow input connections to the router itself only from
+vrf MGMT:
+
+.. code-block:: none
+
+  set firewall ipv4 input filter default-action 'drop'
+  set firewall ipv4 input filter default-log
+  set firewall ipv4 input filter rule 10 action 'accept'
+  set firewall ipv4 input filter rule 10 description 'MGMT - Allow input'
+  set firewall ipv4 input filter rule 10 inbound-interface name 'MGMT'
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