- Software-Defined Networking with OpenFlow（Second Edition）
- Oswald Coker Siamak Azodolmolky
- 40字
- 2021-07-02 15:50:05
Echo
Echo request/reply messages can be sent from either the switch or the controller and must return an echo reply. These messages can be used to indicate the latency, bandwidth, and/or liveliness of a controller-switch connection (that is, a heartbeat).
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