Lab 1 – OSPF Point-to-Point Mode
Prerequisites: CCNP skills.
Here’s our first lab which I hope is going to help us hone the skills with OSPF point-to-point operation.
First, a quick refresher.
Cisco IOS OSPF modes of Operation:
- Point-to-point (Cisco)
- Broadcast (Cisco)
- Non-broadcast (RFC 2328)
- Point-to-multipoint (RFC 2328)
- Point-to-multipoint non-broadcast (Cisco)
It’s time to roll up the sleeves. Below is my topology.
Topology
Workflow
- Read the whole task list first and try to picture what needs to be done.
- Answer the questions listed below BEFORE you start the lab.
- Check the results with your answers given before starting the lab (the answers will available in the next post).
Task List
On router R1:
On router R1:
- Use default encapsulation on serial0/1 interface.
- Enable and configure interfaces as per topology diagram (pic. 1).
- Enable OSPF area 0 on F1/0 interface. Make sure that no other interface is going to be enabled if one is created in the future.
- Enable OSPF area 0 on S0/1 interface. Use the wildcard mask as per original network mask.
- Make sure that both interfaces are OSPF-enabled.
On router R3:
- Use default encapsulation on serial0/1 interface.
- Enable and configure interfaces as per topology diagram (pic. 1).
- Enable OSPF area 0 on F1/0 interface. Make sure that no other interface is going to be enabled if one is created in the future.
- Enable OSPF area 0 on S0/1 interface. Use the wildcard mask as per original network mask.
- Make sure that both interfaces are OSPF-enabled.
On router R1 and R3:
- Check if the OSPF adjacency has been built.
- Check if the the advertised routes are in LSDBs.
- Check the OSPF routing table.
- Check the reachability between the two subnets being advertised.
Questions
- What is the default OSPF mode of operation on F1/0 interface?
- Are hello packets sent using unicast or multicast?
- Does F1/0 interface participate in DR/BDR election? Why?
- What is the default OSPF mode of operation on S0/1 interface?
- Are hello packets sent using unicast or multicast?
- Does it participate in DR/BDR election? Why?
- What are the default hello and dead interval timers used on F1/0 and S0/1?
- Is there any other OSPF mode of operation that could work with the default OSPF mode on F1/0? What would you have to do to make it work?
- Is there any other OSPF mode of operation that could work with the default OSPF mode on S1/0? What would you have to do to make it work?
- Without using the ‘network’ statement, how can you advertise the subnet 10.1.1.0/24?
Video on Youtube with the answers to the questions:
http://www.youtube.com/watch?v=tVBxlSUj77g
Video with the lab and practical presentation for questions 8-10.
http://www.youtube.com/watch?v=cQMgnX7J68E
In the next post, I’m going to post the solution to the lab along with the answers to the questions above.