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Created August 25, 2014 17:39
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gistify499381.java
A.3.8 Barrier Message When the controller wants to ensure message dependencies have been met or wants to receive notifications for completed operations, it may use an OFPT_BARRIER_REQUEST message. This message has no body. Upon receipt, the switch must finish processing all previously-received messages, including sending corresponding reply or error messages, before executing any messages beyond the Barrier Request. When such processing is complete, the switch must send an OFPT_BARRIER_REPLY message with the xid of the original request.
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