Elimination of Duplicate Addresses on an Insertion Ring
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
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.