arrange services and protocols

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+.. _static-routing:
+
+######
+Static
+######
+
+Static routes are manually configured routes, which, in general, cannot be
+updated dynamically from information VyOS learns about the network topology from
+other routing protocols. However, if a link fails, the router will remove
+routes, including static routes, from the :abbr:`RIPB (Routing Information
+Base)` that used this interface to reach the next hop. In general, static
+routes should only be used for very simple network topologies, or to override
+the behavior of a dynamic routing protocol for a small number of routes. The
+collection of all routes the router has learned from its configuration or from
+its dynamic routing protocols is stored in the RIB. Unicast routes are directly
+used to determine the forwarding table used for unicast packet forwarding.
+
+Static Routes
+#############
+
+.. cfgcmd:: set protocols static route <subnet> next-hop <address>
+
+   Configure next-hop `<address>` for an IPv4 static route. Multiple static
+   routes can be created.
+
+.. cfgcmd:: set protocols static route <subnet> next-hop <address> disable
+
+   Disable this IPv4 static route entry.
+
+.. cfgcmd:: set protocols static route <subnet> next-hop <address> distance <distance>
+
+   Defines next-hop distance for this route, routes with smaller administrative
+   distance are elected prior those with a higher distance.
+
+   Range is 1 to 255, default is 1.
+
+   .. note:: Routes with a distance of 255 are effectively disabled and not
+      installed into the kernel.
+
+.. cfgcmd:: set protocols static route6 <subnet> next-hop <address>
+
+   Configure next-hop `<address>` for an IPv6 static route. Multiple static
+   routes can be created.
+
+.. cfgcmd:: set protocols static route6 <subnet> next-hop <address> disable
+
+   Disable this IPv6 static route entry.
+
+.. cfgcmd:: set protocols static route6 <subnet> next-hop <address> distance <distance>
+
+   Defines next-hop distance for this route, routes with smaller administrative
+   distance are elected prior those with a higher distance.
+
+   Range is 1 to 255, default is 1.
+
+   .. note:: Routes with a distance of 255 are effectively disabled and not
+      installed into the kernel.
+
+
+Interface Routes
+================
+
+.. cfgcmd:: set protocols static interface-route <subnet> next-hop-interface <interface>
+
+   Allows you to configure the next-hop interface for an interface-based IPv4
+   static route. `<interface>` will be the next-hop interface where trafic is
+   routed for the given `<subnet>`.
+
+.. cfgcmd:: set protocols static interface-route <subnet> next-hop-interface <interface> disable
+
+   Disables interface-based IPv4 static route.
+
+.. cfgcmd:: set protocols static interface-route <subnet> next-hop-interface <interface> distance <distance>
+
+   Defines next-hop distance for this route, routes with smaller administrative
+   distance are elected prior those with a higher distance.
+
+   Range is 1 to 255, default is 1.
+
+.. cfgcmd:: set protocols static interface-route6 <subnet> next-hop-interface <interface>
+
+   Allows you to configure the next-hop interface for an interface-based IPv6
+   static route. `<interface>` will be the next-hop interface where trafic is
+   routed for the given `<subnet>`.
+
+.. cfgcmd:: set protocols static interface-route6 <subnet> next-hop-interface <interface> disable
+
+   Disables interface-based IPv6 static route.
+
+.. cfgcmd:: set protocols static interface-route6 <subnet> next-hop-interface <interface> distance <distance>
+
+   Defines next-hop distance for this route, routes with smaller administrative
+   distance are elected prior those with a higher distance.
+
+   Range is 1 to 255, default is 1.
+
+
+Blackhole
+=========
+
+.. cfgcmd:: set protocols static route <subnet> blackhole
+
+   Use this command to configure a "black-hole" route on the router. A
+   black-hole route is a route for which the system silently discard packets
+   that are matched. This prevents networks leaking out public interfaces, but
+   it does not prevent them from being used as a more specific route inside your
+   network.
+
+.. cfgcmd:: set protocols static route <subnet> blackhole distance <distance>
+
+   Defines blackhole distance for this route, routes with smaller administrative
+   distance are elected prior those with a higher distance.
+
+.. cfgcmd:: set protocols static route6 <subnet> blackhole
+
+   Use this command to configure a "black-hole" route on the router. A
+   black-hole route is a route for which the system silently discard packets
+   that are matched. This prevents networks leaking out public interfaces, but
+   it does not prevent them from being used as a more specific route inside your
+   network.
+
+.. cfgcmd:: set protocols static route6 <subnet> blackhole distance <distance>
+
+   Defines blackhole distance for this route, routes with smaller administrative
+   distance are elected prior those with a higher distance.
+
+
+Alternate Routing Tables
+========================
+
+TBD
+
+Alternate routing tables are used with policy based routing of by utilizing
+:ref:`vrf`.
+
+
+.. _routing-arp:
+
+###
+ARP
+###
+
+:abbr:`ARP (Address Resolution Protocol)` is a communication protocol used for
+discovering the link layer address, such as a MAC address, associated with a
+given internet layer address, typically an IPv4 address. This mapping is a
+critical function in the Internet protocol suite. ARP was defined in 1982 by
+:rfc:`826` which is Internet Standard STD 37.
+
+In Internet Protocol Version 6 (IPv6) networks, the functionality of ARP is
+provided by the Neighbor Discovery Protocol (NDP).
+
+To manipulate or display ARP_ table entries, the following commands are
+implemented.
+
+Configure
+=========
+
+.. cfgcmd:: set protocols static arp <address> hwaddr <mac>
+
+   This will configure a static ARP entry always resolving `<address>` to
+   `<mac>`.
+
+   Example:
+
+   .. code-block:: none
+
+     set protocols static arp 192.0.2.100 hwaddr 00:53:27:de:23:aa
+
+Operation
+=========
+
+.. opcmd:: show protocols static arp
+
+   Display all known ARP table entries spanning across all interfaces
+
+.. code-block:: none
+
+  vyos@vyos:~$ show protocols static arp
+  Address                  HWtype  HWaddress           Flags Mask     Iface
+  10.1.1.1                 ether   00:53:00:de:23:2e   C              eth1
+  10.1.1.100               ether   00:53:00:de:23:aa   CM             eth1
+
+
+.. opcmd:: show protocols static arp interface eth1
+
+   Display all known ARP table entries on a given interface only (`eth1`):
+
+.. code-block:: none
+
+  vyos@vyos:~$ show protocols static arp interface eth1
+  Address                  HWtype  HWaddress           Flags Mask     Iface
+  10.1.1.1                 ether   00:53:00:de:23:2e   C              eth1
+  10.1.1.100               ether   00:53:00:de:23:aa   CM             eth1
+
+.. _ARP: https://en.wikipedia.org/wiki/Address_Resolution_Protocol