General Setup - MikroTik RouterOS v2.9 Reference Manual

MikroTik RouterOS implements OSPF Version 2 (RFC 2328). The OSPF protocol is the link-state
protocol that takes care of the routes in the dynamic network structure that can employ different
paths to its subnetworks. It always chooses shortest path to the subnetwork first.
Specifications
Packages required: routing
License required: level3
Home menu level: /routing ospf
Standards and Technologies:
Hardware usage: Not significant
Related Documents
• Software Package Management
• IP Addresses and ARP
• Routes, Equal Cost Multipath Routing, Policy Routing
• Log Management
Description
Open Shortest Path First protocol is a link-state routing protocol. It's uses a link-state algorithm to
build and calculate the shortest path to all known destinations. The shortest path is calculated using
the Dijkstra algorithm. OSPF distributes routing information between the routers belonging to a
single autonomous system (AS). An AS is a group of routers exchanging routing information via a
common routing protocol.
In order to deploy the OSPF all routers it will be running on should be configured in a coordinated
manner (note that it also means that the routers should have the same MTU for all the networks
advertized by OSPF protocol).
The OSPF protocol is started after you will add a record to the OSPF network list. The routes
learned by the OSPF protocol are installed in the routes table list with the distance of 110.

General Setup

Home menu level: /routing ospf
Description
In this section you will learn how to configure basic OSPF settings.
Property Description
distribute-default ( never | if-installed-as-type-1 | if-installed-as-type-2 | always-as-type-1 |
always-as-type-2 ; default: never ) - specifies how to distribute default route. Should be used for
ABR (Area Border router) or ASBR (Autonomous System boundary router) settings
• never - do not send own default route to other routers
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OSPF