Skip to main content

Managing IOS images using TFTP

Managing IOS images using TFTP
5.2.5
The page will show students how to store IOS images on a TFTP server.
The IOS may need to be backed up, upgraded, or restored using the copy command. When a router first arrives, the IOS should be backed up. The IOS backup can be initiated from the privileged EXEC mode with the copy flash tftp command. This IOS image can be stored in a central server with other IOS images. These images can be used to restore or upgrade the IOS on the routers and switches in a network. This server should have a TFTP service running. The router will prompt the user to enter the IP address of the TFTP server and to specify a destination filename.
To restore or upgrade the IOS from the server use the copy tftp flash command as shown in Figure . The router will prompt the user to enter the IP address of the TFTP server. Next, the router will prompt the user for the filename of the IOS image on the server. The router may then prompt the user to erase flash. This often happens if there is not sufficient flash available for the new image. As the image is erased from flash, a series of e’s will appear to show the erase process.
As each datagram of the IOS image file is downloaded, an exclamation mark (!) will be displayed. This IOS image is several megabytes and may take a long time to download.
The new flash image will be verified after it is downloaded. The router is now ready to be reloaded to use the new IOS image.
The Lab Activity will allow students to back up a copy of a router IOS onto a TFTP server.
The next page will show students how ROMmon and Xmodem can be used to manage IOS images.

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