Dynamic Routing - OSPF

Mikrotik Basic March 2011

Open Shortest Path First (OSPF)

OSPF is Interior Gateway Protocol (IGP) and distributes routing information only

between routers belonging to the same

Autonomous System (AS)

OSPF is based on link-state technology that has several advantages over

distance-vector protocols such as RIP

OSPF Advantages

No hop count limitations

Multicast addressing is used to send routing information updates

Updates are sent only when network topology changes occur

Logical definition of networks where routers are divided into areas

Transfers and tags external routes injected into AS

OSPF Disadvantages

OSPF is quite CPU and memory intensive due to SPF algorithm and maintenance of

multiple copies of routing information

More complex protocol to implement compared to RIP

OSPF Operation

OSPF is a link-state protocol. Interface of

the router is considered an OSPF link and

state of all the links are stored in link-state

database.

There are several steps before OSPF

network becomes fully functional:

Neighbor discovery

Database Synchronization

Routing calculation

Lab-01

Menu Routing OSPF

Instances Default

Add Networks

Check Interfaces

Check Route List

Test Ping