SPB (shortest path bridging) as an overlay network technology that enables extension of the customer L2 networks over a provider/aggregation layer L2 network. Through SPB overlay, the network is able to provide an E-LAN and E-Line service support for the customer traffic by encapsulating the customer traffic into different services (ISID) and then transporting the traffic over an overlay network (B-VLANs). One challenge that is inherent in this solution, is that all the adjacencies between the end customer switches (BEBs) are virtual. Any technical glitch on local edge switch (BEB) such as link failures on one of the customer SAPs (service access port) or the failure of the service on the BEB (backbone edge bridge) are not immediately notified to the remote end. The following is a method to communicate link fault failure occurring in a BEB across the SPB network.

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