Merge pull request #939 from sever-sever/T1237-failover-route

T1237: Add protocol failover route

docs/configuration/protocols/failover.rst

@@ -0,0 +1,103 @@
+.. _routing-static:
+
+########
+Failover
+########
+
+Failover routes are manually configured routes, but they install
+to the routing table if the health-check target is alive.
+If the target is not alive the route is removed from the routing table
+until the target will be available.
+
+***************
+Failover Routes
+***************
+
+.. cfgcmd:: set protocols failover route <subnet> next-hop <address> check 
+   target <target-address>
+
+   Configure next-hop `<address>` and `<target-address>` for an IPv4 static 
+   route. Specify the target
+   IPv4 address for health checking.
+
+.. cfgcmd:: set protocols failover route <subnet> next-hop <address> check 
+   timeout <timeout>
+
+   Timeout in seconds between health target checks.
+
+   Range is 1 to 300, default is 10.
+
+.. cfgcmd:: set protocols failover route <subnet> next-hop <address> check 
+   type <protocol>
+
+   Defines protocols for checking ARP, ICMP, TCP
+
+   Default is ``icmp``.
+
+.. cfgcmd:: set protocols failover route <subnet> next-hop <address> 
+   interface <interface>
+
+   Next-hop interface for the route
+
+.. cfgcmd:: set protocols failover route <subnet> next-hop <address> 
+   metric <metric>
+
+   Route metric
+
+   Default 1.
+
+
+*******
+Example
+*******
+
+**One gateway:**
+
+.. code-block:: none
+
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 check target '192.0.2.1'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 check timeout '5'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 check type 'icmp'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 interface 'eth0'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 metric '10'
+
+Show the route
+
+.. code-block:: none
+
+  vyos@vyos:~$ show ip route 203.0.113.1
+    Routing entry for 203.0.113.1/32
+    Known via "kernel", distance 0, metric 10, best
+    Last update 00:00:39 ago
+    * 192.0.2.1, via eth0
+
+**Two gateways and different metrics:**
+
+.. code-block:: none
+
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 check target '192.0.2.1'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 check timeout '5'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 check type 'icmp'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 interface 'eth0'
+  set protocols failover route 203.0.113.1/32 next-hop 192.0.2.1 metric '10'
+
+  set protocols failover route 203.0.113.1/32 next-hop 198.51.100.1 check target '198.51.100.99'
+  set protocols failover route 203.0.113.1/32 next-hop 198.51.100.1 check timeout '5'
+  set protocols failover route 203.0.113.1/32 next-hop 198.51.100.1 check type 'icmp'
+  set protocols failover route 203.0.113.1/32 next-hop 198.51.100.1 interface 'eth2'
+  set protocols failover route 203.0.113.1/32 next-hop 198.51.100.1 metric '20'
+
+Show the route
+
+.. code-block:: none
+
+  vyos@vyos:~$ show ip route 203.0.113.1
+  Routing entry for 203.0.113.1/32
+    Known via "kernel", distance 0, metric 10, best
+    Last update 00:08:06 ago
+    * 192.0.2.1, via eth0
+
+  Routing entry for 203.0.113.1/32
+    Known via "kernel", distance 0, metric 20
+    Last update 00:08:14 ago
+    * 198.51.100.1, via eth2

docs/configuration/protocols/index.rst

@@ -9,6 +9,7 @@ Protocols
 
    bfd
    bgp
+   failover
    igmp
    isis
    mpls

docs/copyright.md

@@ -1,6 +1,6 @@
 # Copyright Notice
 
-Copyright (C) 2018-2022 VyOS maintainers and contributors
+Copyright (C) 2018-2023 VyOS maintainers and contributors
 
 Permission is granted to make and distribute verbatim copies of this manual
 provided the copyright notice and this permission notice are preserved on all