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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