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Browse Prior Art Database

Back-Level Node Detection

IP.com Disclosure Number: IPCOM000121180D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Arrowood, AH: AUTHOR [+5]

Abstract

Disclosed is a method to determine the presence and number of intermediate back-level nodes in a route. In computer networks, it is desirable for nodes with enhanced functional capabilities to be able to coexist with nodes with back-level software. When the two route endpoint nodes have enhanced functional capability, they can determine if the route contains intermediate back-level nodes by including a total hop count field and a current hop count field in the route setup command (or other suitable flow).

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This is the abbreviated version, containing approximately 100% of the total text.

Back-Level Node Detection

      Disclosed is a method to determine the presence and number of
intermediate back-level nodes in a route.
In computer networks, it is desirable for nodes with enhanced
functional capabilities to be able to coexist with nodes with
back-level software.  When the two route endpoint nodes have enhanced
functional capability, they can determine if the route contains
intermediate back-level nodes by including a total hop count field
and a current hop count field in the route setup command (or other
suitable flow).

      The total hop count is set by the node originating the command
to the number of links in the route being set up; the current hop
count field is set to zero.  Each node along the route processes the
command and then passes it to the next node.  Each back-level node
does not recognize the two fields and ignores them.  (Having nodes
ignore unrecognized fields is a common communication network design
technique.) Each enhanced node, including the destination node,
increments the current hop count field.  After the destination node
increments the current hop count, it will subtract its value from the
total hop count.  The difference is the number of intermediate
back-level nodes.  This number can be included in the response to the
route setup command in order to inform the originating node of the
number of back-level nodes.

      Disclosed anonymously.