Cisco Networking Tutorial

Cisco devices configuration

Cisco Router Configuration

When we configure a Cisco router, we can use either CLI(Command Line Interface) or GUI(Graphical User Interface). The basic CLI modes that we will be referring below are as following:
Router> <– User EXEC Mode
Router# <– Privileged EXEC mode
Router(config)# <– Global Configuration Mode
Router(config-if)# <– Interface Configuration Mode
Router(config-line)# <– Line Configuration Mode
Most Cisco devices (including routers and switches) use a CLI (Command Line Interface) to configure the network device. We use Cisco Packet Tracer to design and configure a network vertualy.

Network Configuration using Cisco Packet Tracer

Steps to Router Configuration With Cisco Packet Tracer

Step-1(Configuring Router1):

1. Select the router and Open CLI.
2. Press ENTER to start configuring Router1.
3. Type enable to activate the privileged mode.
4. Type config t(configure terminal) to access the configuration menu.
5. Configure interfaces of Router1:
   • Type interface FastEthernet0/0 to access FastEthernet0/0 and Configure the FastEthernet0/0 interface with the IP address 192.168.10.1 and Subnet mask 255.255.255.0.
   • Type interface FastEthernet0/1 to access GigabitEthernet0/0 and Configure the FastEthernet0/1 interface with IP address 192.168.20.1 and Subnet mask 255.255.255.0.
6. Type no shutdown to finish.

Router1 Command Line Interface:

Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#interface FastEthernet0/0 Router(config-if)#ip address 192.168.10.1 255.255.255.0 Router(config-if)#no shutdown Router(config-if)# %LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up Router(config-if)#interface FastEthernet0/1 Router(config-if)#ip address 192.168.20.1 255.255.255.0 Router(config-if)#no shutdown

Step-2(Configuring PCs):

1. Assign IP Addresses to every PC in the network.
2. Select the PC, Go to the desktop and select IP Configuration and assign an IP address, Default gateway, Subnet Mask
3. Assign the default gateway of PC0 as 192.168.10.1.
4. Assign the default gateway of PC1 as 192.168.20.1.

Step-3(Connecting PCs with Router):

1. Connect FastEthernet0 port of PC0 with FastEthernet0/0 port of Router1 using a copper straight-through cable.
2. Connect FastEthernet0 port of PC1 with FastEthernet0/1 port of Router1 using a copper straight-through cable.

See the diagram below:

Router Configuration Table:

Device Name	FastEthernet0/0	Subnet Mask	FastEthernet0/1	Subnet Mask
Router1	192.168.10.1	255.255.255.0	192.168.20.1	255.255.255.0

PC Configuration Table

Device Name	IP address	Subnet Mask	Gateway
PC0	192.168.10.2	255.255.255.0	192.168.10.1
PC1	192.168.20.2	255.255.255.0	192.168.20.1

Let us see another example:

Cleck here to download the file

Router configuration is as follows:

R1-Router1

R2-Router2

R3-Router3

ISP-Router

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