Restartable spanning tree for high availability network systems
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United States of America Patent
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Oct 6, 2009
Grant Date -
N/A
app pub date -
May 16, 2005
filing date -
Dec 9, 1998
priority date (Note) -
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Abstract
A method and apparatus for continuing the operation of a spanning tree protocol at a network device despite crashes or failures at that device is disclosed. The network device includes a plurality of line cards having ports for receiving and forwarding messages and a plurality of supervisor cards for processing at least some of those messages. Upon start-up, one of the supervisor cards is designated the active supervisor, while all other supervisor cards are designated standby supervisors. The active supervisor runs the spanning tree protocol (STP). The active supervisor informs the standby supervisors of the states of ports set by the STP. When a crash or failure occurs at the active supervisor, one of the standby supervisors is immediately designated to be the new active supervisor, and the new active supervisor uses the states of ports set by the original STP.
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