| 摘要 |
The present invention relates to a method for monitoring a status in form of presence and/or absence of a network entity in a network by a presence service, preferably wherein the network is a software defined network, comprising one or more forwarding elements being configurable for recognizing of and applying one or more actions on packets being forwarded by said forwarding elements and one or more network entities wherein said network entities are connectable to one or more of the forwarding elements, preferably wherein each of the network entities is connected to one or more forwarding elements directly, wherein when a network entity subscribed to and discovered by the presence service, the status of said network entity is monitored such that a) the presence service is only provided with a status update of said connected network entity when at least one of said one or more forwarding element, to which said network entity is directly connected, has detected a change in the presence status of the subscribed network entity and wherein b) packets of said network entity destined for the presence service are dropped. |
