The present invention relates to a protection switching method and system for a Multi-Rooted Point-to-Multi-point Service in a Provider Backbone Bridge (PBB) network. In one embodiment, this is accomplished by assigning at least one communication device as Root node, a plurality of intermediate nodes and Leaf nodes, receiving, on at least one of the edge nodes (i.e. Root or leaf), the data packets from a client network interfacing with the PBB network, configuring all the communication edge devices to create a MAC-in-MAC data packet from the received data packet, configuring the Root node to add ISID R and leaf nodes to add ISID L in the I-tag of MAC-in-MAC data packets, determining a fault, if integrity check messages are not received in a predetermined time period between the Root node and the Leaf Nodes and switching the traffic by changing the designated backbone destination MAC address of the MAC-in-MAC data packets from the present root node MAC address to other available superior root node MAC address; wherein switching is performed when integrity failure is detected, or upon network operator request.