Link Stste Routing:

Link Stste Routing:

OSPF – Open shortest path first

1.       Classless routing protocol

2.       Algorithtm used is ospf algorithm

3.       Unlimited hop count

4.       Updates are multicasted

5.       Multicasting address is 224.0.0.5 /224.0.0.6

6.       Event triggerd updates

7.       Updates are incremented

8.       Metric is cost of the link ie. 100/bandwidth

LSA

  Link state advertise are signals or building blocks to create LSDB – Link state database

Syntax:

Router(config) # router ospf  <1-65,535> -can give any number between this.

Router(config-router)# network network id  wildcadmask  area 0

[Wildcadmask = universal broadcast id –subnet mask

Wildcad mask =255.255.255.255 -

                            255.255.255.0 [ class c]

                             0.0.0.255]

[ Network id should be give directly connected networks ]

In this scenario configuration is.

Router1(config) router ospf  100

Router(config-router) network 192.168.10.0  0.0.0.255  area 0

Router(config-router) network 10.0.0.0  0.255.255.255 area 0

Router(config-router) exit.

Router2(config)  router ospf 100

Router(config-router) network 192.168.10.0  0.0.0.255 area 0

Router(config-router) network 192.168.20.0  0.0.0.255 area 0

Router(config-router) network 20.0.0.0  0.255.255.255 area 0

Router(config-router) exit.

Router3(config)# roter ospf 0

Router(config-router) netwok 192.168.20.0  0.0.0.255  area 0

Router(config-router)network 30.0.0.0  0.0.0.255  area 0

Router(config-router) exit.