Method and apparatus for implementing scheduling algorithms in a network element
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United States of America Patent
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Jul 1, 2008
Grant Date -
Nov 24, 2005
app pub date -
May 24, 2004
filing date -
May 24, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Device-wide performance guarantees may be implemented in a network element using a pull forwarding scheme by using separate processes on the network element communicating via handshake signals to enable coordination between the aspects of the network element. One class of processes execute at the ingress queues, a second class of process execut at junction points, and a final class of processes execute at the egress ports. The combination of these separate processes leads to the correct scheduling of frames in a device-wide manner as if there were a centralized scheduler with complete information about all queued frames. As a result, the performance guarantees of the intended scheduling algorithm are preserved and are provided in a device-wide manner. The scheduling algorithms that are supported include round-robin, deficit round robin, negative deficit round robin, weighted round robin, and strict priority.
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