Router Configurations

Router Configuration & Lab

Mode of Router: -

Router have 05 modes and every mode have different characteristics. First mode is when we access the device with any line and then we step by step enter in the remaining modes to check and configure the router. Which are mentioned below.

1. User Execution Mode: -

In this mode only few monitoring commands can be run this is the mode appears just after the completion of boot process of the router. It has limited commands. User mode defined by the > sign with the name of the router. The router cannot be configured from this mode.

2. Privileges Mode: -

By typing enable in the user execution mode and hit enter it will enter in the privileges mode of the router. Where we can view and change the configuration of the router. We will write enable on user execution mode to enter in privileges mode. The # sign will be appear with the name of the router, it is the sign of privileges mode.

3. Global Configuration Mode: -

In this mode we can do the configuration of the router. All configuration can be done in this mode. We write configure terminal in privileges mode to enter in global configuration mode. We will see Config with the name of the router and it is the sign that we are in global configuration mode.

4. Interface Configuration Mode: -

In this mode we will configure the interfaces of the routers. This is also called line mode in this mode we can enter in the specific interface and modify the configuration of the interface.

5. ROMMON Mode: -

It is the mode where we enter by interrupt the POST process. We enter in this mode for password recovery or backing up of IOS on devices. It’s a bootstrap program which initialize the hardware and boots the cisco IOS software when we power on or reload the router. If router doesn’t find a valid image file to load then it enters to the ROMMON mode.

Lab:-

Set Console password and name of router: -

This command is use to set the password on console. This password will require at the time of enter CLI mode via console cable and we will see how to change the name of the router.

Commands: -

thetechnetwork# Configure Terminal

thetechnetwork (Config) #Line console 0

thetechnetwork (Config-Line) #password cisco

thetechnetwork (Config-Line) #Login

thetechnetwork (Config-Line) #Exit

thetechnetwork (Config) #Hostname CCNA

thetechnetwork (Config) #exit

thetechnetwork #

Set banner and save Configuration: -

How to set banner which will prompt on the login screen of the router. When we will access router via console or telnet this banner will appear.

Commands: -

thetechnetwork>

thetechnetwork>enable

thetechnetwork#Configure terminal

thetechnetwork (Config) #banner motd #unauthorize access to this device is prohibitted#

thetechnetwork (Config) #exit

thetechnetwork#Write

Building Configuration....

[OK]

thetechnetwork#

Set remote access: -

For access router via telnet/remote on the network. Don’t need to connect console cable. Router can be accessed on network.

Commands: -

thetechnetwork#Configure Terminal

thetechnetwork (Config) #Line vty 0 4

thetechnetwork (Config-Line) #password cisco

thetechnetwork (Config-Line) #Login

thetechnetwork (Config-Line) #Exit

thetechnetwork (Config) #exit

thetechnetwork #

Save Running Configurations: -

With this command we can save the all configuration of the router after complete the configuration. When we will configure anything on the router first it will save in the NVRAM with the help of this command we will save running configuration and all startup configuration of the router.

Commands: -

thetechnetwork #copy running-config startup-config

overwrite file [startup-config]...(Y/N)Y

Cisco Show Commands (Enable Mode): -

Show Version: -

With the help of this command we can see the version of the router and detail related to the IOS and its images.

Command: -

thetechnetwork # show version

Show Logs: -

With the help of this command we can see the logs of the router. Any configuration change, any port status and all types of logs showed here.

Command: -

thetechnetwork # show logging

Show Interface: -

With the help of this command we can see all the interfaces (serial, fast Ethernet and gigabit) of the routers

Command: -

thetechnetwork # show interface gi0/0/0

Show Interface Brief: -

With the help of this command we can see the configuration of the all interfaces.

Command: -

thetechnetwork # show ip interface brief

Show Flash: -

With the help of this command we can see the flash of the router.

Command: -

thetechnetwork # show flash

Show Clock: -

With the help of this command we can see the time/clock of the router.

Command: -

thetechnetwork # show clock

Show Hosts: -

With the help of this command we can specifies the name servers to use for name resolution.

Command: -

thetechnetwork # show hosts

Show Users: -

With this command we can see how many users login into the router and on which line.

Command: -

thetechnetwork # show users

Show IP Route: -

With the help of this command we can see the all routes of the routers.

Command: -

thetechnetwork # show ip route

Show MAC Table: -

With the help of this command we can see the all MAC addresses of the devices attached with the router.

Command: -

thetechnetwork # show mac-address-table

Show CDP Neighbors: -

This is Cisco Discovery Protocol which helps the cisco router/device to find the neighbor devices of the router. We can see the neighbors of the router which are attached in the neighbor.

Command: -

thetechnetwork # show cdp neighbors