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.. include:: /_include/need_improvement.txt
.. _routing-ospf:
####
OSPF
####
:abbr:`OSPF (Open Shortest Path First)` is a routing protocol for Internet
Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls
into the group of interior gateway protocols (IGPs), operating within a single
autonomous system (AS). It is defined as OSPF Version 2 in :rfc:`2328` (1998)
for IPv4. Updates for IPv6 are specified as OSPF Version 3 in :rfc:`5340`
(2008). OSPF supports the :abbr:`CIDR (Classless Inter-Domain Routing)`
addressing model.
OSPF is a widely used IGP in large enterprise networks.
OSPFv2 (IPv4)
#############
In order to have a VyOS system exchanging routes with OSPF neighbors, you will
at least need to configure an OSPF area and some network.
.. code-block:: none
set protocols ospf area 0 network 192.168.0.0/24
That is the minimum configuration you will need.
It is a good practice to define the router ID too.
.. code-block:: none
set protocols ospf parameters router-id 10.1.1.1
Below you can see a typical configuration using 2 nodes, redistribute loopback
address and the node 1 sending the default route:
**Node 1**
.. code-block:: none
set interfaces loopback lo address 10.1.1.1/32
set protocols ospf area 0 network 192.168.0.0/24
set protocols ospf default-information originate always
set protocols ospf default-information originate metric 10
set protocols ospf default-information originate metric-type 2
set protocols ospf log-adjacency-changes
set protocols ospf parameters router-id 10.1.1.1
set protocols ospf redistribute connected metric-type 2
set protocols ospf redistribute connected route-map CONNECT
set policy route-map CONNECT rule 10 action permit
set policy route-map CONNECT rule 10 match interface lo
**Node 2**
.. code-block:: none
set interfaces loopback lo address 10.2.2.2/32
set protocols ospf area 0 network 192.168.0.0/24
set protocols ospf log-adjacency-changes
set protocols ospf parameters router-id 10.2.2.2
set protocols ospf redistribute connected metric-type 2
set protocols ospf redistribute connected route-map CONNECT
set policy route-map CONNECT rule 10 action permit
set policy route-map CONNECT rule 10 match interface lo
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