Methods of controlling a network node, network nodes and a computer program product are disclosed. A method of controlling a network node, comprises the steps upon determining a proposed change to characteristics of said network node, providing a first indication of said proposed change to other network nodes within a predefined network node cluster of which said network node is a member; in the absence of a second indication from said other network nodes within said network node cluster rejecting said proposed change to said characteristics of said network node, making said proposed change to said characteristics of said network node.