13 14 15 in the operator network for clarity not all connections between the control node 17 and the network nodes are shown in the situation in fig1 a the traffic load is assumed to be high and all network nodes 11 12 13 14 15 are therefore active and handling traffic fig1 b illustrates the same network at a time when the traffic load in the network is lower for example during the night in this case therefore the third network node 13 has been placed in a standby mode this is illustrated in fig1 b by showing the third network node 13 having a dashed frame the links connecting the third network node 13 to other network nodes are also placed in standby mode and are therefore also shown as dashed lines as can be seen all possible start and end points can still be interconnected through the nodes 11 12 14 15 that are still active in more complex networks of course more network nodes can be put in standby mode while still maintaining the possibility to establish all desired connections through the network fig2 a illustrates a first example of how the monitoring function according to embodiments of the invention may be used in which the green metrics function is decentralized in the network four network.