Category: Networking

BGP is the Internet routing protocol. He is making the Internet work.

BGP protocol performs actions by maintaining IP networks table for the biggest network in the world – The Internet. The BGP protocol, as a code of behavior, supported core routing decisions over the Internet.  Instead of using traditional IGP (Interior Gateway Protocol) metrics, BGP protocol relies upon available path, network guidelines and rule-sets for routing decision making purposes. And just for this feature, it is sometimes expressed as a reachability protocol. The main idea behind the BGP creation was to replace the EGP (Exterior Gateway Protocol) to permit a complete decentralized routing. NSFNET backbone is the best example of a decentralized system.

DHCP – Dynamic Host Configuration Protocol is a configuration protocol for the host’s set of connections on the IP networks. Obviously, computers within IP networks should be configured to communicate with each other. But some other information is needed to understand the mechanical of online communication such as IP (internet protocol) addresses, default routes and prefixes. DHCP protocol will let you to get rid of manual handling of certain tasks with a network administrator’s help. A central database should be connected to a network, if this protocol incorporated into it so the chances relating duplicating resource assignments can be eliminated.

If you want to store a backup copy of your router’s configuration on a TFTP server we have a simple solution for you. This article will explain all the commands needed to save backup configuration of a device to TFTP server. All this for Cisco and also for Juniper device.

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You need to make regular backups of your router configuration files and keep copies in a safe place. If you have a serious failure that damages a router’s hardware or software, the configuration will be destroyed. And anybody who has had to reconstruct a complex router configuration file from memory will tell you how difficult and stressful this task is. But if you have a backup of the last working configuration file, you can usually get a router working again within minutes of fixing any hardware problems.

To get the general idea on the subject of FTP, it is important to be acquainted with the word protocol as a significant set of rules and conventions. The aim behind the protocols introduction intent was to make available communication (computer to computer) facilities. And well designed FTP is most suitable for this purpose and that’s why still in use. Though, it is on the screen since 1970s.

FTP is resided on the application layer of OSI standard model so particular tasks can be obtained with its use such as to uphold intercontinental communication and to produce standards relating online communication. File Transfer Protocol is well documented in the form of RFC 959. But all other related documents on the FTP technicality overviews are available at RFC sourcebook. The reliability of this protocol can be judged from that, it belongs to the oldest internet protocols family but can be implemented with the help of TCP protocol.

If we want to send previously prepared configs commands to Router via TFTP we can do this in very simple way and in this article we will se how to do it on Cisco and Juniper device.

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When we use TFTP to download configuration commands to the router, he is not making an echo of each command which reduces overall time consumption, CPU consumption and increases speed.

In this example, we will configure this router by making it receive the file named RConfig from the server at 20.20.1.1 by using the Trivial File Transfer Protocol – TFTP. The router will use the whole file received via TFTP before entering all the commands into the running configuration. This is particularly good because some commands in the configuration process could prevent your access to the router by locking you out or disconnecting you from the network, but the rest of the commands might fix the issue. If you enter the same configurations manually using telnet or “configure t”, you would simply lock yourself out of the router and not be able to continue with your work. A usual example of this issue happens when you change an active access-list. When you enter the first line, the router puts an implicit deny at the end, which will break your connection. Entering commands by using TFTP avoids any of this kind of problem.