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Elimination of Duplicate Addresses on an Insertion Ring

IP.com Disclosure Number: IPCOM000034805D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hall, WD: AUTHOR [+2]

Abstract

This article describes a technique for identification and reassignment of a node that has inappropriately selected a duplicate address on an insertion ring which provides dynamic address assignment. Under failure conditions, a node on an insertion ring in a distributed data processing (DDP) system, such as the one disclosed in [*], may select an address which has been assigned to another node. The failure is identified when the system operation port (SOP) receives a Configuration Error Order from one of the nodes whose address is duplicated. The SOP will then issue a Diagnostic Reset Order to the node with the duplicate address. The second duplicate address on the ring will issue the Configuration Error Order. The SOP can then determine the proper node to be issued the Diagnostic Reset order.

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Elimination of Duplicate Addresses on an Insertion Ring

This article describes a technique for identification and reassignment of a node that has inappropriately selected a duplicate address on an insertion ring which provides dynamic address assignment. Under failure conditions, a node on an insertion ring in a distributed data processing (DDP) system, such as the one disclosed in [*], may select an address which has been assigned to another node. The failure is identified when the system operation port (SOP) receives a Configuration Error Order from one of the nodes whose address is duplicated. The SOP will then issue a Diagnostic Reset Order to the node with the duplicate address. The second duplicate address on the ring will issue the Configuration Error Order. The SOP can then determine the proper node to be issued the Diagnostic Reset order. The first node receiving the Diagnostic Reset Order will clear its address, execute its diagnostics and, based on the results, will either terminate ring operation or again request an address. The Configuration Error order is used to inform the SOP that the drop has detected that another drop has been assigned the same ring address. There is no data associated with this order. Reference * "Local Insertion Bidirectional Ring Architecture," IBM Technical Disclosure Bulletin 31 166-169 (November 1988).

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