What are the different configurations of OSPF?

What are the different configurations of OSPF?

OSPF Non-Broadcast Network Type.

What is OSPF topology?

OSPF [1] is a link state routing protocol. With link state protocols, each router within the domain discovers and builds a complete and consistent view of the network topology as a directed graph. Each router represents a node in the graph, and each link between neighboring routers represents a unidirectional edge.

How configure multiple areas in OSPF?

Step-by-Step Procedure

1. Configure the device interfaces.
2. Configure the router identifier.
3. On each ABR, configure the primary interface for the OSPF area.
4. On each ABR, configure the secondary interface for the OSPF area.
5. If you are done configuring the devices, commit the configuration.

Which two commands are used to configure a basic OSPF configuration?

A number of different Cisco IOS OSPF configuration commands are available, but at its most basic, OSPF configuration uses three commands: the router ospf, network, and router-id commands. The router ospf process-id command is the beginning of any Cisco IOS OSPF configuration.

Which two commands are required for basic OSPF configuration?

Which two commands are required for basic OSPF configuration? Explanation: The “Router ospf [process-id]” command enables OSPF routing protocol in the router and the “[Wildcard-mask] area [area-id]” command is used to select the interfaces that we want to include in the OSPF process.

What is OSPF area?

By definition an OSPF area is a collection of networks, not a collection of routers. A backbone network segment is an IP subnet that belongs to the area identified by 0.0. 0.0. Areas that are not physically connected to the backbone are logically connected by a backbone ABR using an OSPF virtual link.

What are the steps to configure OSPF?

Steps:

1. Configure IP address in R1 and R2.
2. Create one loopback interface in both routers and configure IP address.
3. Enable OSPF and advertise networks.
4. Check routing table, adjacency status and LSDB.

What is the difference between Inter area and intra area?

Note: Intra-area routes refer to updates that are passed within the area. Inter-area routes refer to updates that are passed between areas. In order to reach the outside networks, the routers in the stub area use a default route which is injected into the area by the Area Border Router (ABR).

What is OSPF process ID used for?

The router ospf process-id command is the beginning of any Cisco IOS OSPF configuration. It is used to create or modify an existing OSPF routing process and enters the user into OSPF router configuration mode.

What topology should I use for OSPF?

We will use the following topology: Above we have R1 and R2 in area 0, the backbone area. Between R1 and R3, we will use area 1 and between R2/R4 we will use area 2. R3 and R4 have a loopback interface with an IP address that we will advertise in their area. Let’s start with all network commands to get OSPF up and running.

What is an example of OSPF configuration?

Example: Basic OSPF Configuration for Internal Router ABR and ASBRs. The following example illustrates the assignment of four area IDs to four IP address ranges. In the example, OSPF routing process 109 is initialized, and four OSPF areas are defined: 10.9.50.0, 2, 3, and 0.

What is the OSPF area for a Cisco router?

All routers are in OSPF Area 0. Note that the link between R2 and R1 is an Ethernet (10Mbit) link. All other links are FastEthernet (100Mbit) interfaces. We’ll start with the configuration between R2 and R3: I need to use the router ospf command to get into the OSPF configuration.

What does OSPF stand for?

Configuring OSPF. This module describes how to configure Open Shortest Path First (OSPF). OSPF is an Interior Gateway Protocol (IGP) developed by the OSPF working group of the Internet Engineering Task Force (IETF). OSPF was designed expressly for IP networks and it supports IP subnetting and tagging of externally derived routing information.