Fault localisation in multiple spanning tree based architectures

The invention claims a locating network fault method for. The network includes is more generated tree t1 t2 t3 substantially parallel nodes sw1 to sw4 link and edge nodes en1 to en4 these the tree is a partial separation. The network also comprises the network management component. The method comprises receiving relative network in a plurality of tree topology of the configuration information; Monitoring of network connectivity; When the detected in the network connection the loss of when recognition of failure of the tree and determining the fault of the tree which is common with the network element step of.