Ospf

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Open Shortest Path First (OSPF) Routing Protocol
Document revision 18-Jan-2003 This document applies to the MikroTik RouterOS V2.6

Overview
MikroTik RouterOS implements OSPF Version 2 (RFC 2328). The OSPF protocol is on the link-state protocol that takes careof the routes in the dynamic network structure that can employ different paths to its subnetworks. It always chooses shortest path to the subnetwork first. OSPF distributes routing information between routers belonging to a single autonomous system (AS). An AS is a group of routers exchanging routing information via a common routing protocol.

Contents of the Manual
The following topics arecovered in this manual: Installation Hardware Resource Usage OSPF Description OSPF Setup Setting the Basic OSPF Argument Values OSPF Areas OSPF Network OSPF Interfaces OSPF Virtual Links OSPF Neighbours Running OSPF OSPF Troubleshooting Additional Resources OSPF Application Examples OSPF Backup without using Tunnel OSPF_Main Router Setup OSPF-peer-1 Router Setup OSPF-peer-2 Router Setup RoutingTables Routing Tables with Revised Link Cost Functioning of the Backup OSPF Backup using Encrypted Tunnel through a Third Party

Installation
The OSPF feature is included in the ospf package. The package file ospf-2.6.x.npk can be downloaded from MikroTik’s web page www.mikrotik.com. To install the package, please upload it to the router with ftp and reboot.

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Hardware Resource Usage
There is no significant resource usage.

OSPF Description
For OSPF description and deployment guidelines please refer to list of Additional Resources. Current document discusses OSPF configuration for MikroTik RouterOS. When deploy the OSPF,all routers should be configured in a coordinated manner. Routers belonging to one area should have the same area ID configured. Although Mikrotik RouterOS supports multiple areas, it is not likely that you will deploy structures with many of them.

OSPF Setup
The OSPF management can be accessed under the /routing ospf submenu. After you have divided your networks in areas, you have to configurethe following settings on each OSPF router: 1. Change general OSPF settings of redistributing connected, static and default routes. The default route should be distributed only from border routers of your area; 2. Configure additional areas, if any; 3. If you're using encryption, you also should configure keys in /routing ospf interface command level; 4. Add OSPF network records for all networksyou want the OSPF to run on. The OSPF is started after adding record to the ospf network list. Note! The OSPF protocol is started only on interfaces configured under the /routing ospf network

Setting the Basic OSPF Argument Values
To view the argument settings for OSPF, use the /routing ospf print command, for example:
[admin@MikroTik] routing ospf> OSPF is a shortest path first or link-stateprotocol. OSPF is an interior gateway protocol that distributes routing information between routers in a single autonomous system. OSPF is described in RFC1583. interface OSPF interface settings network OSPF networks area OSPF areas neighbor virtual-link OSPF virtual links print Show OSPF settings get get value of property set Change OSPF settings export Export OSPF settings [admin@MikroTik]routing ospf> print router-id: 0.0.0.0 distribute-default: never redistribute-connected: no redistribute-static: no redistribute-rip: no redistribute-bgp: no

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metric-default: 1 metric-connected: 20 metric-static: 20 metric-rip: 20...