Method and apparatus for updating and synchronizing forwarding tables in a distributed network switch
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United States of America Patent
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May 11, 2004
Grant Date -
N/A
app pub date -
Dec 21, 1999
filing date -
Dec 21, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A mechanism and technique updates and synchronizes forwarding tables contained on line cards that are interconnected by a switch fabric of a distributed network switch. The network switch is preferably a L3 or L4 switch comprising a plurality of forwarding engines distributed among the line cards. Each forwarding engine has an associated forwarding table, which preferably includes a L2 portion and L3/L4 portions. The L2 portion of the table is used to execute forwarding decision operations for frames forwarded among ports of the line cards, whereas the L3/L4 portions of the table are used to execute shortcut and forwarding operations for frames routed among the ports. The mechanism comprises a media access control (MAC) notification (MN) frame for updating and synchronizing the location of a destination port stored in the L2 portions of the forwarding tables.
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