MA alternate routeing
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United States of America Patent
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Aug 21, 2001
Grant Date -
N/A
app pub date -
Mar 18, 1998
filing date -
Jul 31, 1997
priority date (Note) -
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status (Latency 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 within 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, a method is provided wherein static routes (Manual Adjacencies (MA) are created at IS within the IS--IS Area to point to routes to a group of one or more Network Equipments (NEs) within the non-IS--IS Area and where a failure occurs in a link to or within a group and messages from the IS--IS Area to the non-IS--IS Area are looped to the originating IS--IS Area, identification of the NEs from which messages have been looped are removed from the respective MAs allowing routeing of messages via alternative MAs.
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