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Method and system for implementing a fast recovery process in a local area network

A fast recovery, local area network technology, applied in the field of local area network, can solve problems such as slow fault detection, and achieve the effect of reducing the recovery time

Inactive Publication Date: 2004-06-23
NOKIA SOLUTIONS & NETWORKS OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] There are also some problems with the "ICMP echo" method: it only works with links with corresponding IP addresses
As a result, failure detection can be slow, taking anywhere from a few seconds to about 20 seconds, even though the recovery itself is fairly quick

Method used

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  • Method and system for implementing a fast recovery process in a local area network
  • Method and system for implementing a fast recovery process in a local area network
  • Method and system for implementing a fast recovery process in a local area network

Examples

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Embodiment Construction

[0025] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0026] figure 1 A redundant LAN with a tree topology is described in . The term "redundant" means that host connections have been replicated to allow active link LI in the event of a link or path failure 1 Switch to standby link LI 2 . figure 1 There are also effective connections (traffic flows) depicted by dotted lines in . The connection is established between host 1 and router R1. It should be noted that the LAN topology in this example has at least two levels of LAN switches.

[0027] If one of the first-level LAN switches SW1,..., SW6 fails, i.e. fault 1, or is powered off for maintenance, etc., there will be no major problem because the hosts "host 1", ..., "Host 9" is directly connected to the first LAN switch and it can detect itself when the link / LAN port goes from connected state to link down state. Recovery can be ini...

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PUM

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Abstract

The present invention concerns a method and a system for accelerating fault recovery in a redundant, tree structured local area network. The invention is used to define some of the LAN ports, which are, for example, used to connect the switch (SW) into the IP router, as critical ones. Likewise, some other LAN ports, used to connect the IP hosts to said switch (SW), are defined as dependent of the critical links. If a critical LAN port or corresponding link is found to be non-functional, e.g. no carrier sensed, all LAN ports or corresponding links depending on it are declared as non-functional. The declaration is done at link level in a way which allows the device(s) or ports connected to the other end of the link to notice that the link is not in use anymore to carry traffic.

Description

technical field [0001] The present invention relates to local area networks (LANs). More particularly, the present invention relates to a novel and improved method and system for implementing a fast recovery process within a local area network. Background technique [0002] A local area network (LAN) is a group of shared communication lines and often a single Processor or server computers and related equipment. In this context, the local area network may also denote the use of so-called "loosely coupled multiprocessor" architectures in which messages between the processors are sent via Ethernet. Such an architecture can be implemented, for example, in IP trunks, MSC servers (Mobile Switching Center, MSC) of "All-IP" architectures for third generation mobile networks, or in servers such as Connection Processing Servers (CPS) or Home Subscriber Servers within the network unit. [0003] Typically, the server has application and data storage shared by multiple computer users...

Claims

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Application Information

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IPC IPC(8): H04L12/24
CPCH04L41/0663H04L41/26H04L41/0677
Inventor 毛利·萨克斯奥
Owner NOKIA SOLUTIONS & NETWORKS OY
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