Loop prevention technique for mpls using service labels

The local fast rerouting (FRR technology) is implemented as a computer network frame. To the technical, a edge device for detecting to hindering which is adjacent circuit domain communication node or link fault, and edge device at least part addressing to the territory's data packet rerouting to the spare edge device, the spare edge device in a set of retransmit to the adjacent domain. The front retransmitted spare edge device of assigned of grouping of rerouting is an arc-shaped groove (i.e. a rerouting) data packet. The spare edge device for transmitting and receiving data packet protection according to distinguish for containing the predetermined shape of service wherein MPLS label laminated packet of label. The other, testing, served label to serve as is carried out FRR rerouting the identifier of packet. The receiving comprises service data packet of label, the spare edge device is not allowed for example to respond Arranged in Ling receiving node or link failure once more rerouting packets, wherein prevented to form a loop in network frame.