Browse Prior Art Database

Short-Order Poll

IP.com Disclosure Number: IPCOM000038648D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Ervin, JP: AUTHOR [+2]

Abstract

The article describes a technique (called Short Order Poll) that allows a station on a local area network (LAN) to determine the identity of the next active upstream neighbor (NAUN). The technique requires a short-order poll request MAC frame and a short-order poll response MAC frame. The technique can be used by both an inserting and de-inserting station. The figure shows a LAN with a plurality of stations connected thereto. For an inserting station, the process requires the following steps: 1.Upon insertion, station I broadcasts a short-order poll request MAC frame with the NAUN sub-vector containing a null value. 2.Station A copies the frame and turns on the ARI/FCI bits. Other stations on the ring will ignore the broadcast frame because the frame has been copied by A. 3.Station A then enters short-order poll mode. 4.

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Short-Order Poll

The article describes a technique (called Short Order Poll) that allows a station on a local area network (LAN) to determine the identity of the next active upstream neighbor (NAUN). The technique requires a short-order poll request MAC frame and a short-order poll response MAC frame. The technique can be used by both an inserting and de-inserting station. The figure shows a LAN with a plurality of stations connected thereto. For an inserting station, the process requires the following steps: 1.Upon insertion, station I broadcasts a short-order poll request MAC frame with the NAUN sub-vector containing a null value.
2.Station A copies the frame and turns on the ARI/FCI bits. Other stations on the ring will ignore the broadcast frame because the frame has been copied by A.
3.Station A then enters short-order poll mode. 4.Station A sends a short-order poll response MAC frame to its NAUN (Station B). 5.Station B broadcasts a ring poll response MAC frame with its ID in the NAUN sub-vector field of the message. 6. Station I copies the ring poll response MAC frame and extracts the address of Station B from the sub-vector field. 7. Station I transmits a ring poll response with its own address in the NAUN sub-vector field. 8.Station A receives a message and extracts the address of Station I therefrom. 9.Station I will now exit the short-order poll mode. A station leaving the ring may use one of the following de-insertion routines: 10.On leaving the ring, Station I broadcasts a short-order poll request MAC frame with the NAUN sub-vector containing its NAUN address. In the figure, the NAUN address would be that of Station B.
11.Station A copies the ring poll response MAC frame and turns on the ARI/FCI bits. Other stations...