Cost propagation switch protocols
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United States of America Patent
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Dec 10, 2002
Grant Date -
N/A
app pub date -
Jan 11, 1999
filing date -
May 4, 1998
priority date (Note) -
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Abstract
A switch to switch protocol for network load balancing which exchanges cost information among all switches in a load balance domain. As compared to prior techniques, the protocol of the present invention updates all switches in the load balance domain periodically. All switches in the load balance domain are thereby assured of having consistent cost information regarding all switches in the load balance domain. Further, the protocol of the present invention reduces the volume of cost messaging traffic as exemplified by techniques which generate updates to the information any time a cost parameter of a switch changed. The preferred embodiment of he protocol of the present invention exchanges messages describing the switch latency for each switch in the load balance domain. A bit mask field in the transmitted cost packets indicates which switches have already received the cost information. Receipt of the same packet a second time by a switch which already received the cost packet is indicative of a loop in the network and the propagation of that packet is terminated.
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