Browse Prior Art Database

Redundant Asynchronous Transfer Mode Switching Module

IP.com Disclosure Number: IPCOM000117638D
Original Publication Date: 1996-Apr-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 4 page(s) / 114K

Publishing Venue

IBM

Related People

Beraud, JP: AUTHOR [+2]

Abstract

One of the major concerns any network provider has when running a communications network is to make sure all network users can use it any time. To achieve this goal, the first thing the network provider has to implement is a network with no single point of failure.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Redundant Asynchronous Transfer Mode Switching Module

      One of the major concerns any network provider has when running
a communications network is to make sure all network users can use it
any time.  To achieve this goal, the first thing the network provider
has to implement is a network with no single point of failure.

      A fully meshed node implementation, together with the software
able to reroute the traffic around any failing node, is certainly the
right answer for the traffic which has already entered the network;
however, for the traffic trying to enter the network, if the access
node fails, all end users of this access node are stuck.  Of course,
a possible solution to this problem would be to have all end users
having a redundant connection to another access node but this might
not be either feasible or affordable.

      A better, and cheaper, solution would be to try to configure
the access node in such a way that the node itself is able to recover
from any error it could have, will it be software or hardware; and
the way to achieve this is to provide redundancy for the vital
components; i.e., those components which are required to have the
node fully operational.

      For 8260 Asynchronous Transfer Mode (ATM) hubs, in addition to
the redundancy already provided for the power, cooling, control and
management components, the other vital component requiring redundancy
is the ATM Switch/Control Point module.

      This invention describes the implementation of the redundant
ATM Switch/Control Point module capability.

      General Directions
  o  Installation of the redundant ATM Switch/Control Point module
      may come any time even when the Hub is already operating with a
      single ATM Switching Module.
  o  Only one ATM Switch/Control Point module  is active at a time.
  o  Easy improvement to provide a full nondisruptive and automatic
      fallback/switchback with the implementation of the ATM
connection
      set up/release mirroring between the two ATM Switch/Control
Point
      modules.

      Functionality provided by this invention
  o  Automatic selection of the active ATM Switch/Control Point
module
      at each reset of the ATM Subsystem.
  o  Permanent monitoring of the active by the backup.
  o  When fallback, configuration used to reboot the ATM Subsystem
is
      the configuration saved in the backup ATM Switch/Control Point
      module  flash EEPROM which is identical to the latest
configuration
      saved in the active ATM Switch/Control Point module.
  o  Permanent monitoring of the backup by the active, and trap
      generation in case the backup fails.
  o  Non-disruptive reset or unplugging of the backup ATM
      Switch/Control Point module.
  o  Hot plugging of the backup ATM Switch/Control Point module,
      automatic detection and backup process initialization.

The following h...