Due to a ransomware attack, the wiki was reverted to a July 2022 version. . We apologize for the lack of a more recent valid backup.
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Link latency can be accounted by calculating time between sending a packet from a host and receiving it at another host over that link, to achieve this, controller need to identify possible links(more than one intents) between two hosts and then flows of these intents will have comprise of flows which have a unique matching criteria so that it is impossible to match this criterion with real network traffic. Then send a packet (e.g. UDP packet, which matches the unique matching criteria) from controller to the port connecting source host and redirect to controller while reached as soon as it reaches the destination port i.e. the port where destination host is connected. A P4 program or experimenters implementation can be used to notify controller about the time when this special packet entered source port and got out from destination port for latency calculation.
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