Rap alternate routeing for ISO 10589
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United States of America Patent
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-
Apr 23, 2002
Grant Date -
N/A
app pub date -
Mar 18, 1998
filing date -
Jul 31, 1997
priority date (Note) -
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Abstract
In a Synchronous Digital Hierarchy (SDH) based communications network comprising a plurality of Intermediate Systems (IS), the IS being divided between at least one IS--IS Area and at least one non-IS--IS Area, an IS--IS Area being an area with which a routeing protocol forming part of the Network Layer (Layer 3) of the Open Systems Interconnection including routeing (OSI), is provided for routeing messages between areas, whereby where a message is routed from an IS--IS Area to a destination IS within a non-IS--IS Area and the connection to the destination IS is broken, and as a result a message is returned from the non-IS--IS Area to the originating IS--IS Area connection to the destination IS is made by a second choice connection.
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