Apparatus and method of assigning VLAN tags
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United States of America Patent
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Jan 30, 2001
Grant Date -
N/A
app pub date -
Jul 1, 1998
filing date -
Jul 1, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for and method of assigning a VLAN tag to a frame received at a port of a switch are disclosed. The apparatus includes a content addressable memory, a data frame memory, a search circuit, and a tagging circuit. The content addressable memory stores tagging information, the tagging information including lookup data and associated tag data. The frame memory stores at least part of a data frame, the part including data frame information. The search circuit is connected to the content addressable memory and the data frame memory. The search circuit reads the data frame information, searches the content addressable memory for the lookup data corresponding to the data frame information, and reads a corresponding subset of the associated tag data. The tagging circuit is connected to the search circuit and the data frame memory. The tagging circuit writes in the data frame memory a VLAN tag including the corresponding subset of the associated tag data.
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