Skip to main content

Troubleshooting using show controllers

Troubleshooting using show controllers 
9.3.6 
This page will teach students about troubleshooting using the show controllers command.
Router configuration and troubleshooting can be performed remotely when physical inspection of the connections is not possible. The show controllers command is useful to determine the type of cable connected without inspecting the cables. 
The output displayed by the show controllers command indicates the type of cable detected by the controller. This is useful for finding a serial interface with no cable, the wrong type of cable, or a defective cable.
The show controllers serial 0/0 command queries the integrated circuit, or controller chip, that controls the serial interfaces and displays information about the physical interface serial 0/0. This output varies for different controller chips.
Regardless of the controller chip type, the show controllers command produces a large amount of output. Other than the cable type, most of this output is internal technical detail about the controller chip status. Without specific knowledge of the integrated circuit, this information is of little use.
The Lab Activity will show students how to troubleshoot with the show controllers command.
The Interactive Media Activity will help students link network problems to the corresponding layer of the OSI model.
The next page will introduce the debug command.

Comments

Post a Comment

Popular posts from this blog

OSI layers / Peer-to-peer communications / TCP/IP model

OSI layers 2.3.4 This page discusses the seven layers of the OSI model. The OSI reference model is a framework that is used to understand how information travels throughout a network. The OSI reference model explains how packets travel through the various layers to another device on a network, even if the sender and destination have different types of network media. In the OSI reference model, there are seven numbered layers, each of which illustrates a particular network function. - Dividing the network into seven layers provides the following advantages: • It breaks network communication into smaller, more manageable parts. • It standardizes network components to allow multiple vendor development and support. • It allows different types of network hardware and software to communicate with each other. • It prevents changes in one layer from affecting other layers. • It divides network communication into smaller parts to make learning it easier to understand. In the foll...
Post a Comment
Read more

Advantages and disadvantages of link-state routing

Advantages and disadvantages of link-state routing 2.1.5  This page lists the advantages and disadvantages of link-state routing protocols. The following are advantages of link-state routing protocols:  Link-state protocols use cost metrics to choose paths through the network. The cost metric reflects the capacity of the links on those paths. Link-state protocols use triggered updates and LSA floods to immediately report changes in the network topology to all routers in the network. This leads to fast convergence times. Each router has a complete and synchronized picture of the network. Therefore, it is very difficult for routing loops to occur. Routers use the latest information to make the best routing decisions. The link-state database sizes can be minimized with careful network design. This leads to smaller Dijkstra calculations and faster convergence. Every router, at the very least, maps the topology of it...
Post a Comment
Read more

PC Basic...

• Backplane – A backplane is an electronic circuit board containing circuitry and sockets into which additional electronic devices on other circuit boards or cards can be plugged; in a computer, generally synonymous with or part of the motherboard. • Network interface card (NIC) – An expansion board inserted into a computer so that the computer can be connected to a network. • Video card – A board that plugs into a PC to give it display capabilities. • Audio card – An expansion board that enables a computer to manipulate and output sounds. • Parallel port – An interface capable of transferring more than one bit simultaneously that is used to connect external devices such as printers. • Serial port – An interface that can be used for serial communication in which only one bit is transmitted at a time. • Mouse port – A port used to connect a mouse to a PC. • USB port – A Universal Serial Bus connector. A USB port connects devices such as a mouse or printer to the computer ...
Post a Comment
Read more