High resiliency network infrastructure

Details High resiliency network infrastructure High resiliency network infrastructure

1998-12-23

2004-03-30

Kizou, Hassan (Department: 2662)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S244000, C370S409000, C370S395520, C370S218000

Reexamination Certificate

active

06714549

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to the field of communication networks. More specifically, the invention relates to improving resiliency, scalability, and efficiency in the infrastructure of a network.
The increased popularity of and reliance on the Internet has made the Internet the ultimate computer network. Millions of users around the world access the Internet for personal as well as business use daily. The Internet, however, is not really a specific network at all, but rather an amorphous mass of interconnected networks spanning the globe while utilizing the same Internet Protocol (IP) to pass information from one network to another. The networks making up the Internet are typically arranged in groups of computers connected together to allow information to be transmitted to one another. Such groups are referred to as “local area networks (LAN).” The LAN medium is “connectionless,” i.e., users on the LAN exchange message information without building specific connections to one another. LANs can be connected together to form a larger network (referred to as a “wide area network (WAN)”) that may have geographically spaced network members. LANs/WANs that are connected to the Internet are often referred to as “subnetworks” or “subnets” of the Internet.
Communication networks and their operations can be described according to the well-known Open Systems Interconnection (OSI) model (also referred to as the “OSI stack protocol”) developed by the International Organization for Standardization (ISO). Each of seven layers (i.e., application, presentation, session, transport, network, data link, and physical interface) of the OSI model performs a specific data communications task that provides a service to and for the layer that precedes it (e.g., the network layer provides a service for the transport layer). The operation of the OSI model is often likened to placing a letter in a series of envelopes before it is sent through the postal system. Each succeeding envelope adds another layer of processing or overhead information necessary to process the transaction. Together, all the envelopes help make sure the letter gets to the right address and that the message received is identical to the message sent. Once the entire package is received at its destination, the envelopes are opened one by one until the letter itself emerges exactly as written.
The ISO has specifically defined all seven layers, which are summarized below in the order in which the data actually flows as it leaves its source:
*Layer
7
, the application layer, provides for a user application (such as getting money from an automatic bank teller machine) to interface with the OSI application layer. The OSI application layer has a corresponding peer layer in another open system, e.g., the bank's host computer.
*Layer
6
, the presentation layer, makes sure the user information (a request for $50 in cash to be debited from the user's checking account) is in a format (i.e., syntax or sequence of ones and zeros) the destination open system can understand.
*Layer
5
, the session layer, provides synchronization control of data between the open systems (i.e., makes sure the bit configurations that pass through layer
5
at the source are the same as those that pass through layer
5
at the destination).
*Layer
4
, the transport layer, ensures that an end-to-end connection has been established between the two open systems and is reliable.
*Layer
3
, the network layer, provides routing and relaying of data through the network (among other things, at layer
3
, on the outbound side, the “envelope” will be labeled with an “address” which is read by layer
3
at the destination).
*Layer
2
, the data link layer, includes flow control of data as messages pass down through this layer in one open system and up through the peer layer in the other open system.
*Layer
1
, the physical interface layer, includes the ways in which data communications equipment is connected mechanically and electrically, and the means by which data moves across those physical connections from layer
1
at the source to layer
1
at the destination.
Information transported from network to network on the Internet is done through a system called “packet switching.” All information that is sent or received over the Internet is broken down or disassembled into small portions (referred to as “packets”) in accordance with a protocol known as “Transmission Control Protocol (TCP).” These packets are labeled with address information specifying the destination of each packet, together with an indication of the order in which the packets are to be reassembled at the intended destination. Internet “routers,” which join one network to another along the transmission paths of the Internet, are used as path finding devices charged with interpreting the packet labels and determining the best transmission path for a particular packet to take on route to the ultimate destination. On its way to the ultimate destination, the packet will be processed by multiple routers at various points of the Internet. The addressing and routing of the packets conforms with a protocol known as “Internet Protocol (IP).” According to the IP, each node of the Internet is provided with a unique IP address having a specific length and format.
Each segment between routers is a point-to-point data transmission referred to as a “hop.” Although one hop will typically include transmission over a communication line segment connecting one network to another, often a hop will cause a packet to be passed through one or more other network components such as repeaters, hubs, bridges, gateways and switches that are each used by a network to facilitate the transmission of the packets through the network. A repeater, for example, is used to amplify the packet data to extend the distance in which the packet can travel. Repeaters are often found in the dedicated broadband telecommunications connection known as a “backbone,” such as the Internet backbone provided by MCI. (A backbone network (referred herein simply as “backbone”) is a “transit” network often made up of long-distance telephone trunk lines and other wired and wireless links such as microwave and satellite links for use in transmitting large amounts of data simultaneously between host computer systems connected to the Internet. Normal communicated data typically neither originates nor terminates in a backbone network.) A hub is used to tie individual or groups of computers together, controlling the order in which the computers can transmit information to one another. Bridges link LANs together, allowing data designated for one LAN to pass through from one to another. Gateways work like bridges, but also translate data between one network type to another. A switch establishes a connection between disparate transmission path segments in a network (or between networks). A router, which is essentially an intelligent bridge, can be used to control the various path segments connected by a switch based on the destination information contained in the label of a given packet.
Once the transmitted packets arrive at the ultimate destination, the packets are reassembled in proper order by a local server and forwarded to one or more local computers. As with the computer system transmitting the original data packets, the local server is typically connected to the local computers (or terminals) using a direct LAN line, modem dial up, or other well-known connection. As used herein, any computer that is assigned an IP address and connected to the Internet is referred to as a “host.” Generally, two types of hosts are present in a system: “server hosts,” which provide services (e.g., web site, e-mail, file access, etc.) to remote computers and terminals; and “client hosts,” which only access services on the Internet provided by server hosts.
Users whose computers and networks are not directly connected to the Internet typically gain access to the Internet through Internet Access Providers (IAPs), Internet Service Providers (ISPs), and Online

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