Method and apparatus for restricting the assignment of VLANs
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United States of America Patent
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Aug 23, 2005
Grant Date -
N/A
app pub date -
Dec 29, 2000
filing date -
Aug 26, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Restricting the assignment of VLANs so that a unique VLAN or set of VLANs must be assigned to each link for a particular network circuit (NC) or group of NCs. NCs are prevented from being assignd a particular VLAN if the addition of the VLAN assignment will create a mix-match topology, which may either create a loop or prevent a loop from being able to be properly blocked without inadvertently blocking a link of another NC. Restriction of VLAN assignment allow a single conventional spanning tree to be run to ensure that there are no layer 2 forwarding loops exist while at the same time not inadvertently blocking the path of another NC.
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