Configuring an interface description
3.2.3 This page will teach students how to configure an interface description.
To configure an interface description, enter global configuration mode. From global configuration mode, enter interface configuration mode. Use the command description followed by the information.
The steps to configure an interface description are as follows:
1. Use the configure terminal command to enter global configuration mode.
2. Enter a specific interface mode such as interface ethernet 0.
3. Enter the command description followed by the information that is to be displayed, such as XYZ Network, Building 18.
4. Use Ctrl-Z to exit interface mode and return to privileged EXEC mode.
5. Use the copy running-config startup-config command to save the configuration changes to NVRAM.
Here are two examples of interface descriptions:
interface ethernet 0
description LAN Engineering, Bldg.2
interface serial 0
description ABC network 1, Circuit 1
The next page will describe login banners.
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Interface descriptions
Interface descriptions
3.2.2 This page will explain what interface descriptions are and why they are used.
An interface description should identify important information such as a router, a circuit number, or a specific network segment. A description of an interface can help a network user remember specific information about the interface, such as what network the interface services.
The description will appear in the configuration files that exist in the router memory. However, it will not affect the operation of a router. A description only provides information about an interface. Descriptions are created by following a standard format that applies to each interface. The description may include the purpose and location of the interface, other devices or locations connected to the interface, and circuit identifiers. Descriptions allow support personnel to better understand the scope of problems related to an interface and allow for faster resolution of problems.
The next page will describe how interface descriptions are configured.
3.2.2 This page will explain what interface descriptions are and why they are used.
An interface description should identify important information such as a router, a circuit number, or a specific network segment. A description of an interface can help a network user remember specific information about the interface, such as what network the interface services.
The description will appear in the configuration files that exist in the router memory. However, it will not affect the operation of a router. A description only provides information about an interface. Descriptions are created by following a standard format that applies to each interface. The description may include the purpose and location of the interface, other devices or locations connected to the interface, and circuit identifiers. Descriptions allow support personnel to better understand the scope of problems related to an interface and allow for faster resolution of problems.
The next page will describe how interface descriptions are configured.
Importance of configuration standards
Importance of configuration standards
3.2.1 This page explains why it is important to develop standards for configuration files within an organization.
Configuration standards can be used to control of the number of configuration files that must be maintained, how the files are stored, and where the files are stored.
A standard is a set of rules or procedures that are either widely used or officially specified. If an organization does not have standards, the network will be in chaos if a service interruption occurs.
Network management requires a centralized support standard. Configuration, security, performance, and other issues must be addressed for the network to function properly. The creation of standards for network consistency helps reduce network complexity, unplanned downtime, and events that may affect network performance.
The next page will discuss interface descriptions.
3.2.1 This page explains why it is important to develop standards for configuration files within an organization.
Configuration standards can be used to control of the number of configuration files that must be maintained, how the files are stored, and where the files are stored.
A standard is a set of rules or procedures that are either widely used or officially specified. If an organization does not have standards, the network will be in chaos if a service interruption occurs.
Network management requires a centralized support standard. Configuration, security, performance, and other issues must be addressed for the network to function properly. The creation of standards for network consistency helps reduce network complexity, unplanned downtime, and events that may affect network performance.
The next page will discuss interface descriptions.
Configuring an Ethernet interface
Configuring an Ethernet interface
3.1.7 This page will explain how an Ethernet interface can be configured from the console or a virtual terminal line.
Each Ethernet interface must have an IP address and subnet mask to route IP packets.
To configure an Ethernet interface follow these steps:
1. Enter global configuration mode.
2. Enter interface configuration mode.
3. Specify the interface address and subnet mask.
4. Enable the interface.
By default, interfaces are turned off, or disabled. To turn on or enable an interface, the command no shutdown is entered. If an interface needs to be disabled for maintenance or troubleshooting, use the shutdown command to turn off the interface.
This page concludes this lesson. The next lesson will explain how a configuration is finalized. The first page covers the importance of configuration standards.
3.1.7 This page will explain how an Ethernet interface can be configured from the console or a virtual terminal line.
Each Ethernet interface must have an IP address and subnet mask to route IP packets.
To configure an Ethernet interface follow these steps:
1. Enter global configuration mode.
2. Enter interface configuration mode.
3. Specify the interface address and subnet mask.
4. Enable the interface.
By default, interfaces are turned off, or disabled. To turn on or enable an interface, the command no shutdown is entered. If an interface needs to be disabled for maintenance or troubleshooting, use the shutdown command to turn off the interface.
This page concludes this lesson. The next lesson will explain how a configuration is finalized. The first page covers the importance of configuration standards.
Making configuration changes
Making configuration changes
3.1.6 This page will explain how configuration variables can be changed in different modes.
If a configuration requires modification, go to the appropriate mode and enter the proper command. For example, if an interface must be enabled, enter global configuration mode, enter interface mode, and issue the command no shutdown.
To verify changes, use the show running-config command. This command will display the current configuration. If the variables displayed are not correct, the environment can be changed in the following ways:
• Issue the no form of a configuration command.
• Reload the system to return to the original configuration file from NVRAM.
• Copy an archived configuration file from a TFTP server.
• Remove the startup configuration file with the erase startup-config, then restart the router and enter setup mode.
To save the configuration variables to the startup configuration file in NVRAM, enter the following command at the privileged EXEC prompt:
Router#copy running-config startup-config
The next page will teach students how to configure an Ethernet interface
3.1.6 This page will explain how configuration variables can be changed in different modes.
If a configuration requires modification, go to the appropriate mode and enter the proper command. For example, if an interface must be enabled, enter global configuration mode, enter interface mode, and issue the command no shutdown.
To verify changes, use the show running-config command. This command will display the current configuration. If the variables displayed are not correct, the environment can be changed in the following ways:
• Issue the no form of a configuration command.
• Reload the system to return to the original configuration file from NVRAM.
• Copy an archived configuration file from a TFTP server.
• Remove the startup configuration file with the erase startup-config, then restart the router and enter setup mode.
To save the configuration variables to the startup configuration file in NVRAM, enter the following command at the privileged EXEC prompt:
Router#copy running-config startup-config
The next page will teach students how to configure an Ethernet interface
Configuring a serial interface
Configuring a serial interface
3.1.5 This page will explain how a serial interface can be configured from the console or through a virtual terminal line. To configure a serial interface follow these steps:
1. Enter global configuration mode.
2. Enter interface mode.
3. Specify the interface address and subnet mask.
4. Set clock rate if a DCE cable is connected. Skip this step if a DTE cable is connected.
5. Turn on the interface.
Each connected serial interface must have an IP address and subnet mask to route IP packets. Configure the IP address with the following commands:
Router(config)#interface serial 0/0
Router(config-if)#ip address
Serial interfaces require a clock signal to control the timing of the communications. In most environments, a DCE device such as a CSU/DSU will provide the clock. By default, Cisco routers are DTE devices but they can be configured as DCE devices.
On serial links that are directly interconnected, as in a lab environment, one side must be considered a DCE and provide a clocking signal. The clock is enabled and speed is specified with the clock rate command. The available clock rates in bits per second are 1200, 2400, 9600, 19200, 38400, 56000, 64000, 72000, 125000, 148000, 500000, 800000, 1000000, 1300000, 2000000, or 4000000. Some bit rates might not be available on certain serial interfaces. This depends on the capacity of each interface.
By default, interfaces are turned off, or disabled. To turn on or enable an interface, the command no shutdown is entered. If an interface needs to be administratively disabled for maintenance or troubleshooting, the shutdown command used to turn off the interface.
In the lab environment, the clockrate setting that will be used is 56000. The commands that are used to set a clock rate and enable a serial interface are as follows:
Router(config)#interface serial 0/0
Router(config-if)#clock rate 56000
Router(config-if)#no shutdown
The next page will teach students how to change configurations.
3.1.5 This page will explain how a serial interface can be configured from the console or through a virtual terminal line. To configure a serial interface follow these steps:
1. Enter global configuration mode.
2. Enter interface mode.
3. Specify the interface address and subnet mask.
4. Set clock rate if a DCE cable is connected. Skip this step if a DTE cable is connected.
5. Turn on the interface.
Each connected serial interface must have an IP address and subnet mask to route IP packets. Configure the IP address with the following commands:
Router(config)#interface serial 0/0
Router(config-if)#ip address
Serial interfaces require a clock signal to control the timing of the communications. In most environments, a DCE device such as a CSU/DSU will provide the clock. By default, Cisco routers are DTE devices but they can be configured as DCE devices.
On serial links that are directly interconnected, as in a lab environment, one side must be considered a DCE and provide a clocking signal. The clock is enabled and speed is specified with the clock rate command. The available clock rates in bits per second are 1200, 2400, 9600, 19200, 38400, 56000, 64000, 72000, 125000, 148000, 500000, 800000, 1000000, 1300000, 2000000, or 4000000. Some bit rates might not be available on certain serial interfaces. This depends on the capacity of each interface.
By default, interfaces are turned off, or disabled. To turn on or enable an interface, the command no shutdown is entered. If an interface needs to be administratively disabled for maintenance or troubleshooting, the shutdown command used to turn off the interface.
In the lab environment, the clockrate setting that will be used is 56000. The commands that are used to set a clock rate and enable a serial interface are as follows:
Router(config)#interface serial 0/0
Router(config-if)#clock rate 56000
Router(config-if)#no shutdown
The next page will teach students how to change configurations.
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