Update ospf.rst

add command and their explanation

1 files changed, 78 insertions, 8 deletions

diff --git a/docs/configuration/protocols/ospf.rst b/docs/configuration/protocols/ospf.rst
index a4188c68..77bb34b0 100644
--- a/docs/configuration/protocols/ospf.rst
+++ b/docs/configuration/protocols/ospf.rst
@@ -19,20 +19,90 @@ 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.
+.. cfgcmd:: set protocols ospf area <number>
 
-.. code-block:: none
+   This command is udes to enable the OSPF process. The area number can be 
+   specified in decimal notation in the range from 0 to 4294967295. Or it
+   can be specified in dotted decimal notation similar to ip address.
 
-  set protocols ospf area 0 network 192.168.0.0/24
+.. cfgcmd:: set protocols ospf area <number> network A.B.C.D/M
 
-That is the minimum configuration you will need.
-It is a good practice to define the router ID too.
+   This command specifies the OSPF enabled interface(s). If the interface has 
+   an address from defined range then the command enables ospf on this 
+   interface so router can provide network information to the other ospf 
+   routers via this interface.
 
-.. code-block:: none
+.. cfgcmd:: set protocols ospf auto-cost reference-bandwidth <number>
 
-  set protocols ospf parameters router-id 10.1.1.1
+   This command sets the reference bandwidth for cost calculations, where 
+   bandwidth can be in range from 1 to 4294967, specified in Mbits/s. The 
+   default is 100Mbit/s (i.e. a link of bandwidth 100Mbit/s or higher will 
+   have a cost of 1. Cost of lower bandwidth links will be scaled with 
+   reference to this cost).
+
+.. cfgcmd:: set protocols ospf default-information originate [always] [metric <number>] [metric-type <1|2>] [route-map <name>]
+
+   Originate an AS-External (type-5) LSA describing a default route into all 
+   external-routing capable areas, of the specified metric and metric type. 
+   If the :cfgcmd:`always` keyword is given then the default is always advertised, 
+   even when there is no default present in the routing table. The argument
+   :cfgcmd:`route-map` specifies to advertise the default route if the route map 
+   is satisfied.
+
+.. cfgcmd:: set protocols ospf default-metric <number>
+   
+   This command specifies the default metric value of redistributed routes.
+   The metric range is 0 to 16777214.
+   
+.. cfgcmd:: set protocols ospf distance global <distance>
+
+   This command change distance value of OSPF. The distance range is 1 to 255.
+
+.. cfgcmd:: set protocols ospf distance ospf <external|inter-area|intra-area> <distance>
+
+   This command change distance value of OSPF. The arguments are the distance 
+   values for external routes, inter-area routes and intra-area routes 
+   respectively. The distance range is 1 to 255.
+   
+   .. note:: Routes with a distance of 255 are effectively disabled and not
+      installed into the kernel.
+
+.. cfgcmd:: set protocols ospf parameters router-id <rid>
+   
+   This command sets the router-ID of the OSPF process. The router-ID may be an
+   IP address of the router, but need not be - it can be any arbitrary 32bit number.
+   However it MUST be unique within the entire OSPF domain to the OSPF speaker – bad
+   things will happen if multiple OSPF speakers are configured with the same router-ID!
+   
+.. cfgcmd:: set protocols ospf parameters rfc1583-compatibility
+
+   :rfc:`2328`, the successor to :rfc:`1583`, suggests according to section G.2 (changes)
+   in section 16.4.1 a change to the path preference algorithm that prevents possible 
+   routing loops that were possible in the old version of OSPFv2. More specifically it 
+   demands that inter-area paths and intra-area backbone path are now of equal preference 
+   but still both preferred to external paths.
+
+   This command should NOT be set normally.
+
+.. cfgcmd:: set protocols ospf passive-interface <interface>
+
+   This command specifies interface as passive. Passive interface advertises its address, 
+   but does not run the OSPF protocol (adjacencies are not formed and hello packets are 
+   not generated).
+
+.. cfgcmd:: set protocols ospf passive-interface default
+
+   This command specifies all interfaces as passive by default. Because this command changes 
+   the configuration logic to a default passive; therefore, interfaces where router adjacencies
+   are expected need to be configured with the :cfgcmd:`passive-interface-exclude` command.
+
+.. cfgcmd:: set protocols ospf passive-interface-exclude <interface>
+
+   This command allows exclude interface from passive state. This command is used if the
+   command :cfgcmd:`passive-interface default` was configured.
 
+Configuration example
+---------------------
 
 Below you can see a typical configuration using 2 nodes, redistribute loopback
 address and the node 1 sending the default route: