NDLI: Fast Failure Detection of OpenFlow Channels

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Fast Failure Detection of OpenFlow Channels

Content Provider	ACM Digital Library
Author	Kotani, Daisuke Okabe, Yasuo
Abstract	We propose a mechanism to detect OpenFlow channel failures quickly in switches and controllers where multiple controllers are running. In OpenFlow networks, it is important to maintain OpenFlow channels between controllers and switches are up and to detect channel failures immediately, so that messages to notify events such as port down and modification of flow tables are always delivered to the other side surely and immediately. Exchanging keep-alive messages frequently is undesirable for controllers because the controllers should handle many keep-alive messages from switches. This would be a significant overhead when the rate of other messages than keep-alive ones is low, because the controllers are forced to handle many keep-alive messages although such keep-alive messages do not affect network control directly. Our proposed mechanism adaptively sends keep-alive messages to detect quickly that a message is not reached to the other side, instead of checking whether a channel is up. A controller shares a message received from a switch with other controllers in a timely manner, and the controller regards a channel has been unavailable if the message notified by other controllers has not arrived via the channel. A switch sends keep-alive messages to all channels just after sending an important asynchronous message such as a port status message, and regards all channels have been gone down if the switch does not receive any response. The evaluation shows that our proposed mechanism reduces failure detection delay to timeout until receiving a response, and that overhead on latency is negligible.
Starting Page	32
Ending Page	39
Page Count	8
File Format	PDF
ISBN	9781450339148
DOI	10.1145/2837030.2837035
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-11-18
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Software-defined networking Openflow Failure detection
Content Type	Text
Resource Type	Article

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