OSPF

OSPF. yup. i know you must be have a lot of question about OSPF.
OSPF as you know is a LSPR.

what you must know is the characteristic about OSPF:
- OSFP is a classless routing protocol.
- OSPF update with multicast(224.0.0.5 and 224.0.0.6)
- OSPF using Djistrak Algorithm to count metric.
- OSPF had AD 110
- OSPF had a fitur to Authentication

You also must known about 5 Type OSPF LSP:
- Hello -> to establish connection and maintain connection with another OSPF.
- DBD(Database Description) -> it contain database value in a router, and being used to database sinchronize with another router.
- LSR(Link State Request) -> To ask about information with an entry in DBD, if different with another router
- LSU(Link State Update) -> to answer LSR and to give a new information.
- LSACK(Link State Acknowledgement) -> To ack all LSP Packet.
- LSA(Link State Advertisemnt) -> Contain information about neighbor network (Cost).

To understand more, let us practice using packet tracer.
Below is the topology

I will skip giving IP Intefaces because i assume you already know how to set IP.
now let set ospf configuration in Router.
Below is the configuration for its

HQ:
network 192.168.158.0 0.0.0.127 area 0
network 192.168.158.128 0.0.0.63 area 0
network 192.168.159.96 0.0.0.3 area 0
network 192.168.159.100 0.0.0.3 area 0

R1:
network 192.168.159.64 0.0.0.31 area 0
network 192.168.158.192 0.0.0.63 area 0
network 192.168.159.96 0.0.0.3 area 0

R2:
network 192.168.157.0 0.0.0.255 area 0
network 192.168.159.0 0.0.0.63 area 0
network 192.168.159.100 0.0.0.3 area 0

Hope this tutorial can help you more understand the concept ospf.
Next time we will learn more about combining ospf,eigrp and rip in a network.