The configuration is pretty simple and requires only two major steps:ġ. R1(config-if)#no shut Router 2 R2(config-if)#int fa0/0 On to it then!Ģ.Configure IP addresses on PCs and router interfaces. A router that connects an OSPF network to other routing networks (for example, to an EIGRP network) is called an Autonomous System Border Router ( ASBR).įor now we’ll configure basic OSPF. Ī router that has interfaces in more than one area (for example area 0 and area 1) is known as an Area Border Router ( ABR). All routers inside an area must have the same area ID. Routing tables on the routers are reduced.Įach area in an OSPF network must be connected to the backbone area ( also known as area 0).The main benefits of using areas in an OSPF network are:
All routers in the same area have the same topology table and don’t know about routers in other areas. OSPF areasĪn area is simply a logical grouping of adjacent networks and routers. Hello packets are sent to the multicast address of 224.0.0.5. OSPF neighbors are dynamically discovered by sending Hello packets out each OSPF-enabled interface on a router. Routers running OSPF need to establish a neighbor relationship before exchanging routing updates. Topology table-stores topology structure of the network.Neighbor table-which stores information about OSPF neighbors.OSPF routers store routing and topology information in three tables.: Each OSPF router runs the SFP algorithm to calculate the best routes and adds them to the routing table. It uses the multicast address of 224.0.0.5 and 224.0.0.6 for communication between OSPF-enabled neighbors It uses costas the parameter for determining route metric. OSPF has a default administrative distance of 110. It is an open standard, so it can be run on routers from different vendors. It is perhaps one of the most popular link state routing protocols. Open Shortest Path First(OSPF) is one of the dynamic routing protocols amongst others such as EIGRP, BGP and and RIP. But just before we get to configure, let’s have an overview of OSPF. Welcome ! This tutorial will give you an easy guide of configuring basic OSPF on a Cisco Router.
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