Facts about OSPF
It has a default administrative distance of 110
It supports classless addressing and variable-length subnetmask (VLSM)
It is a link state routing protocol
It supports manual route summarization
It keeps all available routes to a network
It converges quickly
Its uses cost to select the shortest path to a destination network.
Implementation
I will start from Router 1. On this router, I will set the hostname, assign IP addresses to interface s0/3/0 and interface f0/0, and configure OSPF in area 0. See the commands below:
Router 1
Router>en
Router#conf t
Router(config)#hostname Router1
Router1(config)#int s0/3/0
Router1(config-if)#ip add 192.168.4.1 255.255.255.252
Router1(config-if)#no shut
Router1(config-if)#int f0/0
Router1(config-if)#ip add 192.168.1.1 255.255.255.0
Router1(config-if)#no shut
Router1(config-if)#exit
Router1(config)#router ospf 1
Router1(config-router)#network 192.168.1.0 0.0.0.255 area 0
Router1(config-router)#network 192.168.4.0 0.0.0.3 area 0
Router1(config-router)#no shut
You may also like: Cisco CCNA: Implementing EIGRP with VLSM and manual summarization.
Next, I will configure Router2. On this router, I will assign IP addresses to the two serial interfaces as well as the f0/0 interface, configure hostname for the router and configure OSPF in area 0 for the three networks. The two serial interfaces on router2 are DCE and as such, will be clocked. See commands below.
Router 2
Router>en
Router#conf t
Router(config)#hostname Router2
Router2(config)#int s0/3/0
Router2(config-if)#ip add 192.168.4.2 255.255.255.252
Router2(config-if)#clock rate 64000
Router2(config-if)#no shut
Router2(config-if)#ip add 192.168.5.2 255.255.255.252
Router2(config-if)#clock rate 64000
Router2(config-if)#no shut
Router2(config-if)#int f0/0
Router2(config-if)#ip add 192.168.2.1 255.255.255.0
Router2(config-if)#no shut
Router2(config-if)#exit
Router2(config)#router ospf 1
Router2(config-router)#network 192.168.2.0 0.0.0.255 area 0
Router2(config-router)#network 192.168.4.0 0.0.0.3 area 0
Router2(config-router)#network 192.168.5.0 0.0.0.3 area 0
Router2(config-router)#no shut
One Router3, the configuration will be similar to that of Router1 save for the networks. See commands below:
Router 3
Router>en
Router#conf t
Router(config)#hostname Router3
Router3(config)#int s0/3/0
Router3(config-if)#ip add 192.168.5.1 255.255.255.252
Router3(config-if)#no shut
Router3(config-if)#int f0/0
Router3(config-if)#ip add 192.168.3.1 255.255.255.0
Router3(config-if)#no shut
Router3(config-if)#exit
Router3(config)#router ospf 1
Router3(config-router)#network 192.168.3.0 0.0.0.255 area 0
Router3(config-router)#network 192.168.5.0 0.0.0.3 area 0
Router3(config-router)#no shut
Read more at https://www.timigate.com/2018/04/configuring-ospf-for-a-network-topology-of-three-cisco-routers-and-five-networks.html
| Posted: at | |
TRENDING GISTS 
Farmer, Terkula Chile Remanded Over Attempted Murder In Benue
Faces Of Four Full Grown Men Nabbed For Alleged Transformer Theft In Ebonyi
Portable Brags About His International Status As A Caucasian Lady Requests For A Photo With Him
Jubilation In Nigeria As Many Are Currently Receiving N50k Inside Their Account From Tinubu's Govt
JUST IN: FCCPC Shuts Down Popular 4U Supermarket in Abuja Over ‘Unfair Pricing’
Infamous 'Womb Raider' Bags 50yr Jail Term After Ripping Out Baby From a Heavily Pregnant Teen