Detection of forwarding problems for external prefixes
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United States of America Patent
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Aug 9, 2011
Grant Date -
Jan 24, 2008
app pub date -
Oct 2, 2007
filing date -
Jan 7, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatus for enabling a provider to perform a tracing procedure to determine the existence forwarding problems within its network are disclosed. According to one aspect of the present invention, a method for detecting a forwarding problem within an autonomous system includes initiating a message from a source node. The message is sent to a message destination that is an external address relative to the autonomous system. The method also includes forwarding the message from the source node along a path to the external address which includes an intermediate node and a destination node. The message is received on the destination node through a first path segment of the path. Finally, the message is removed from the path at the destination node, and a response that indicates that the intermediate node does not have a forwarding problem is sent along the first path segment to the source node.
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