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Traffic network flow control using dynamically modified metrics for redundancy connections

A business volume, interconnected network technology, applied in the field of data transmission between routers, which can solve problems such as complex implementation and correct configuration

Inactive Publication Date: 2005-08-17
GENERAL INSTR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem with existing RIP implementations is that implementations that receive routes with the same cost from two different routers select only one of the routers as the "next hop," and when the selected next-hop router stops advertising, The described implementation would wait three minutes before accepting a route with the same cost from a different router
While providing faster routers and faster link failure detection times, such protocols become more complex to implement and properly configure

Method used

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  • Traffic network flow control using dynamically modified metrics for redundancy connections
  • Traffic network flow control using dynamically modified metrics for redundancy connections
  • Traffic network flow control using dynamically modified metrics for redundancy connections

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Embodiment Construction

[0024] It should be noted that herein, any reference to "one embodiment" or "an embodiment" refers to a specific feature, structure or characteristic related to the embodiment included in at least one embodiment of the present invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0025] Figure 1 depicts a block diagram of a system to which various aspects of the invention are applicable. A backbone router 3 connected to the Internet 4 uses a redundant connection to an access router 5 via local area networks (LANs) LAN1 and LAN2. The access router 5 performs access for individual Internet users who have access to the Internet via, for example, cable, digital subscriber line (DSL) or a dial-up connection via a dial-up modem.

[0026] Access router 5 implements a logical IP subnet at its user access end (also referred to herein as "access subnet 6-8"). Inside the access sub...

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Abstract

Distance vector routing protocols such as the Routing Information Protocol fail to rapidly reconfigure to use redundant links. By modifying the outgoing advertised hop count upon detecting a failure in a connection for which a backup or redundant connection exists, incoming traffic is diverted to the redundant or backup connection. An artificially high hop count is advertised for a given port, and when a failure or loss of reachability occurs in a connection associated with that port, an advertisement of a lower hop count on the backup or redundant connection for the given port is triggered. This causes rapid rerouting of incoming traffic to the backup or redundant connection.

Description

technical field [0001] The present invention generally relates to methods and apparatus for transferring data between routers, and more particularly to a method and apparatus for transferring data between two routers using the Internet Protocol. Background technique [0002] Historically, the Routing Information Protocol (RIP) was the most widely used Internet routing protocol due to its early implementation and its relatively simple structure. RIP is one of the most persistent of all routing protocols. RIP and many RIP-like protocols are based on a set of algorithms that use distance vectors to mathematically compare routes to identify the best path to any given destination address. These algorithms were developed from academic research dating back to 1957. [0003] RIP sends routing update messages at regular intervals and when the network topology changes. When a router receives a routing update that includes an entry change, the router updates its routing table to ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56
CPCH04L45/20H04L45/28H04L45/02H04L45/22H04L12/28G08C15/00
Inventor 迈克·W·帕特里克郭俊晶(音译)史蒂文·A·弗雷
Owner GENERAL INSTR CORP
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