Link state identifier collision handling
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United States of America Patent
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Oct 16, 2012
Grant Date -
Feb 24, 2011
app pub date -
Aug 20, 2009
filing date -
Aug 20, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatus for a network element to handle LSID collisions to prevent different LSAs associated with different routes from sharing the same LSID. According to one embodiment, responsive to determining that a tentative LSID that is generated for a first route that is being added collides with an LSID that is assigned to an LSA for a second route, and that one of the first and second routes is a host route, the host route is suppressed. If the first route is the host route, suppressing includes not originating an LSA for the first route. If the second route is the host route, suppressing includes purging the LSA for the second route and not originating an LSA for the second route. Although the host route is suppressed, network reachability of the range subsuming the host route is provided through the route that is not the host route.
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