Ring network protection method and device

Abstract

The invention provides a looped network protecting method and device. The method comprises the steps that a center node obtains a mapping relation between a forward inlet label of a first tunnel at a first node and a forward outlet label of the first tunnel at a second node; the center node judges whether a tunnel label of a received service message is matched with the forward inlet label of the first tunnel at the first node; if the tunnel label is matched with the forward inlet label of the first tunnel at the first node, the center node replaces the tunnel label of the service message with the forward outlet label of the first tunnel at the second node. According to the looped network protecting method and device, when the number of intersected rings in a looped network is greater than or equal to 3 and any two intersected points containing the first node have faults simultaneously, the center node replaces the tunnel label of the service message with the forward outlet label according to the mapping relation between the forward inlet label and the forward outlet label so that the service message can be directly sent to a target node, and it is guaranteed that service is not broken. In addition, according to the looped network protecting method and device, the amount of configuration maintenance work and equipment loads are reduced.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a ring network protection method and device. Background technique [0002] Compared with traditional linear protection, MPLS ring network protection has the advantages of lower configuration and maintenance workload, resource saving and high reliability, so the MPLS ring network protection scheme has been popularized. [0003] There are a large number of single nodes across multiple intersecting rings in the communication network, such as figure 1 Shown is a ring network topology diagram in which a single node spans multiple rings, such as figure 1 The N rings shown intersect, node B and node C are the intersection points of ring 1 and ring 2, node E and node C are the intersection points of ring 2 and ring 3, node D and node C are the intersection points of ring N-1 and ring N , where node C is the intersection point of all rings. When the cross-ring ser...

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Problems solved by technology

[0004] However, when node B and node D fail at the same time, node B and node E fail at the same time, node B and node F fail at the same time, or any two nodes other than node B fail at the same time, the central node C is required to conduct two tunnels The label switching action of the information can avoid service interruption, but in multi-protocol label switching, a node cannot implement the label switching action of tunnel information twice, so the service will be interrupted at the central node C, that is, any two nodes including node B. Simultaneous failure of intersection points, or simultaneous failure of any two intersection points other than Node B will result in forward service interruption

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