What are the different configurations of OSPF?

What are the different configurations of OSPF?

• OSPF Non-Broadcast Network Type.
• OSPF Broadcast Network Type.
• OSPF Point-to-Multipoint Network Type.
• OSPF Point-to-Multipoint Non-Broadcast Network Type.
• OSPF Point-to-Point Network Type.
• OSPF Next Hop with Network Types.

How many OSPF areas can be configured?

In general, to maximize stability, one router should not be in more than three areas. Designated router (DR) selection: In general, the DR and backup designated router (BDR) on a multiaccess link (for example, Ethernet) have the most OSPF work to do.

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 four classes of routers are distinguished by OSPF?

OSPF Router Types

• Internal Router. —A router with that has OSPF neighbor relationships only with devices in the same area.
• Area Border Router (ABR) —A router that has OSPF neighbor relationships with devices in multiple OSPF areas.
• Backbone Router.
• Autonomous System Boundary Router (ASBR)

What are the three categories of OSPF?

OSPF area types

1. Type 1 – Represents a router.
2. Type 2 – Represents the pseudonode (designated router) for a multiaccess link.
3. Type 3 – A network link summary (internal route)
4. Type 4 – Represents an ASBR.
5. Type 5 – A route external to the OSPF domain.
6. Type 7 – Used in stub areas in place of a type 5 LSA.

Why OSPF is not scalable?

In theory, OSPF topology is limited by the number of links that can be advertised in the Router LSA as each router gets only one Router LSA and it cant be bigger than 64K which is the biggest an IP packet can be. This is even less probable and hence there are no scalability problems with OSPF per se.

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 router ID in OSPF?

The OSPF Router ID is used to provide a unique identity to the OSPF Router. OSPF Router ID is an IPv4 address (32-bit binary number) assigned to each router running the OSPF protocol. If there is no Loopback Interfaces configured, the highest IP address on its active interfaces is selected as the OSPF Router ID.

How do I change my router ID in OSPF?

If you want to change the router ID setting, do the following:

1. Go to the global config context; the CLI prompt appears similar to the following:
2. If OSPF is not enabled, go to Step 3; if OSPF is enabled, use no router ospf to disable OSPF operation.
3. Use ip router-id ip-addr to specify a new router ID.

Why use multi area in OSPF?

The reason you would create multiple area types is to avoid overwhelming routers with a huge routing table and topology database when they do not need to understand this information. To reduce router overhead in a large OSPF network, you can create different types of areas.

What is multi area OSPF?

When a large OSPF area is divided into smaller areas, this is called multiarea OSPF. Multiarea OSPF requires a hierarchical network design. The main area is called the backbone area (area 0) and all other areas must connect to the backbone area.

How to configure a Cisco router?

Choose Configure > Router > Router Options and click Edit if you want to change the Hostname,Domain Name,Banner,and Enable Secret Password properties for a router.

Choose Configure > Router Access > User Accounts/View in order to add/edit/delete the User Accounts to the router.

Choose Configure > Utilities > Save Running Config to PC in order to save the configuration to the NVRAM of the router as well as the PC and to reset

How to enable OSPF?

Step 1. Use the command router ospf process ID to start OSPF.

Step 2. Use the network command to enable the interfaces.

Step 3. Identify area assignments.

Step 4. Example 3-1 displays OSPF with a process ID of 1 and places all interfaces configured with an IP address in area…

What does the show ip OSPF interface command reveal?

show ip ospf interface [type-number] This command is used to show how OSPF has been configured on an interface level, as well as how it is working at the interface. This level of detail is excellent for troubleshooting configuration errors. Example 5-8 shows the output of this command.

How does OSPF protocol work?

OSPF as a link-state protocol. The router processes all data in the topology table and makes use of the Dijkstra algorithm to determine all routes to all networks, as well as the least-cost routes. All this information is stored in the SFP tree, identifying preferred and secondary routes.