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Methods and apparatus for randomly distributing traffic in a multi-path switch fabric

專利號(hào)
US10097479B1
公開日期
2018-10-09
申請(qǐng)人
Juniper Networks, Inc.(US CA Sunnyvale)
發(fā)明人
Philip A. Thomas; Sarin Thomas; Jean-Marc Frailong; Pradeep Sindhu
IPC分類
H04L12/947; H04L12/707; H04L12/935
技術(shù)領(lǐng)域
egress,switch,indicator,module,schedule,status,fabric,stage,data,port
地域: CA CA Sunnyvale

摘要

In some embodiments, an apparatus comprises a schedule module within a switch fabric system. At a first time, the schedule module is configured to access a list of status indicators associated with a group of egress port indicators. The list of status indicators includes a set of status indicators each of which has a value greater than a threshold. The schedule module is configured to randomly select a status indicator from the set of status indicators and configured to reduce the value of the selected status indicator. The schedule module is then configured to send the egress port indicator associated with the selected status indicator such that a data cell is sent from an egress port associated with that egress port indicator. At a second time, when the value of every status indicator from the list of status indicators is not greater than the threshold, the schedule module is configured to increase the value of every status indicator above the threshold.

說明書

After a status indicator is selected by the schedule module from the set of status indicators associated with egress ports available for sending a data cell, an egress port indicator associated with the selected status indicator can be sent by the schedule module to a processor (e.g., processor 306 shown in FIG. 3) or another portion of the switch module, such that the data cell can be sent from an egress port associated with the egress port indicator. For example, after the second leftmost status indicator from status indicator list 521 having the value of “0|1|1| . . . |0” is selected by the schedule module, egress port indicator “2”, which is associated with the second leftmost status indicator, is sent by the schedule module to a processor of the switch module, such that the data cell is sent from an egress port associated with egress port indicator “2”.

In some embodiments, after a status indicator is selected from the set of status indicators by the schedule module, the schedule module can be configured to modify the value of the selected status indicator. Specifically, the schedule module can be configured to change the value of the selected status indicator from the first value to the second value. For example, after the second leftmost status indicator from status indicator list 521 having the value of “0|1|1| . . . |0” is selected by the schedule module, the schedule module is configured to change the value of the second leftmost status indicator from 1 to 0. As a result, the status indicator list stored in the first entry 521 of schedule table 500 is changed from “0|1|1| . . . |0” to “0|0|1| . . . |0”.

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