Routers identify each other through the RID in AS. It must be unique within the autonomous system. RID is a unique identifier of Router in OSPF network. Before we move in next state let’s understand what is RID. In this state routers choose RID (Router ID). In down state routers prepares themselves for neighborship process. In this stage OSPF learns about the local interfaces which are configured to run the OSPF instance.
R1 does not know which protocol is running on R2. Down stateĪt this point both routers have no information about each other. We just turned on both routers simultaneously. Routers are connected with each other via serial link. Assume that our network has two routers running OSPF routing protocol. Let’s understand these states with a simple example. Believe me OSPF is the most complex routing protocol among the routing protocols which you will study in CCNA. But if you are a beginner or Cisco exam candidate, I suggest you to go through the entire article without skipping any section. If you are an intermediate or advance leaner, grab this tutorial from where you want. In this part we will explain OSPF metric component bandwidth, Delay, Load, Reliability and MTU with cost calculation formula in detail with examples. This tutorial is the last part of this article. OSPF Metric cost Calculation Formula Explained This part explains these parameters in detail with examples. Configuration part of OSPF includes process ID, Area ID and wildcard mask which make its setup a litter bit harder. This tutorial is the fourth part of this article.
This part explains these parameters and OSPF adjacency in detail with examples. OSPF neighborship is built between two routers only if configuration value of Area ID, Authentication, Hello and Dead interval, Stub Area and MTU are matched. This tutorial is the second part of this article. OSPF Neighborship Condition and Requirement In this part we explained basic terminology of OSPF such as Feature, Advantage and Disadvantage, Autonomous System, Area concept, ABR, IR, Link, State ,LSA and LSDB with example. This tutorial is the first part of this article. You can read other parts of this article here. This tutorial is the third part of our article “OSPF Routing Protocol Explained with examples".
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