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Understanding OpenFlow Multipart Messages on Devices Running Junos OS


Multipart messages are supported only on Juniper Networks devices running OpenFlow v1.3.1 or later.

To more efficiently process large OpenFlow data responses, OpenFlow v1.3.1 introduces support for multipart messages.

The OpenFlow controller can use a multipart request message to request the following information:

  • Switch, group, or port descriptions

  • Single-flow, aggregate-flow, flow table, port, or group statistics

  • Group or table features

In response, a Juniper Networks device can send one or more multipart response messages wherein each message includes the same request identifier. In addition, each message in the sequence, except the last message, includes a flag that indicates more messages are to follow.