Routers and Its Role in a Network

The Internet is formed by networks throughout the world interconnecting and passing on data to each other. cisco router make the Internet work by forwarding data using a unified addressing system. They can send information to anywhere in the world as long as that location has an IP address.

Description

Routers vary inside to large expensive machines for commercial applications to small wireless boxes for the home electronics market. A router combines dedicated hardware and specialist software to achieve its task. To be effective, a cisco routers needs to be connected to at least two separate networks because its main task is to forward data from one network to another.

Operation

Routers rely on the Internet Protocol to provide a common addressing system. The protocol defines an address structure which is universally implemented and is enforced by one controlling authority in each country. The IP address of any computer contactable over the Internet has to be unique. The computer sending information over the Internet has to package that data into a packet. The data packet contains a header which includes the IP address of the destination computer. Used routers read this address and then forward the packet in the direction of its destination.

Routing Tables

A router prepares for its work by compiling a list of possible routes to a particular destination. The format of the table does not require that every IP address is listed. They can be noted in groups. When a router is first installed it contacts its neighboring routers. These are the routers to which it is immediately connected. Each of these neighbors send their routing tables to the used cisco routers which then compiles its own routing table. Routers regularly exchange their routing tables and so information about routes held on one router eventually ripples through to all routers in the world.

Algorithm

The routing table contains several different paths to the same destination. The router uses an algorithm to rank these alternatives. There are many different routing algorithms in the world, but they generally all rely on the direction and the distance travelled to reach the target. The distance is often recorded as the number of links the cisco router used crosses. The direction tells the router which of its immediate neighbors starts that route.

Function

Although the routing table contains alternative routes it does not list the routers in the path of that route, only the first router in the chain. The next router receiving the data packet then makes a calculation to decide which of its neighbors will receive the packet next, and so on. This distributed decision making allows used routes to be switched in case of broken connections further down the line of which the originating router is unaware.

Cisco Demos WLAN Controller for Branch Offices at Interop

Cisco Systems officials over the past few months have built out the capabilities of their Borderless Networks initiative in such areas as mobility, security and management. Now the networking giant is looking to extend the reach of the strategy into branch offices.

At Interop 2011 this week in Las Vegas, cisco router officials are showing off their new Flex 7500 Series Cloud Controller and new Integrated Services Router Web Security products for the ISR G2 branch router. The products are part of Cisco’s efforts to meet the demand from businesses that are looking to bring such key capabilities as management and security out of the branch offices and back into main headquarters, according to Prashanth Shenoy, senior manager of Borderless Networks marketing.

“Since data centers began consolidating about a decade ago, a lot of things have been moved out of the branch offices and into the central data center,” Shenoy said in an interview with eWEEK, adding that IT departments are being asked to grow the level of services they offer while seeing their staffing being reduced.

Despite that consolidation, businesses still need to offer the same level of service and user experience to their employees in the branch offices, he said. With the new products announced May 10, businesses will be able to consolidate more of their IT infrastructure in the central data center—a move that will help drive down capital and operational costs—without hurting the operations of the branch offices, and deliver their services through the increasingly popular cloud computing model.

The Flex 7500 Series Cloud Controller is housed in the data center, letting IT administrators remotely manage up to 500 branch offices from a central location. They can remotely wireless policies, manage the branch offices and offer security settings without the time and expense of having to physically go to the offices, Sylvia Hooks, senior manager of mobility marketing at cisco871 , said in an interview.

The new WLAN (wireless LAN) controller can control up to 2,000 WiFI access points—twice the number currently supported—and more than 20,000 clients from the data center, Hooks said. A goal was to “allow the branch office to be independent” while still getting the technology capabilities they need to do their jobs, she said.

 The controller is available immediately, starting at $47,955.

In addition, Cisco in July will start shipping the ISR Web Security software, which extends the company’s ScanSafe Cloud Web Security to branch offices by putting centralized Web protection and malware detection onto the ISR G2 branch router.

According to  cisco 871 officials, the new software will not require businesses to buy more hardware. Instead, the software is in the router, enabling branch offices to use local Internet access capabilities, which will save users time, money and resource that otherwise would go toward hardware deployments.

The software can be delivered via the cloud, while the management is done centrally, they said.

Cisco is aggressively building out its Borderless Networks efforts, which revolve around the idea of getting access to a company’s network anytime, from anywhere and through any device.