Method, device and system for determining corresponding relation

The invention provides a method, a device and a system for determining a corresponding relation. The method comprises the following steps: acquiring a topology identifier and corresponding equipment; the first network device obtains a first corresponding relation, the first corresponding relation comprises multicast source group (S, G) information and at least one next hop, and any next hop in the at least one next hop is a device which is obtained through calculation and corresponds to the topology identification. According to the technical scheme provided by the invention, the SLA of the multicast service can be met. 本申请提供了一种确定对应关系的方法、装置以及系统，该方法包括：获取拓扑标识以及对应的设备；所述第一网络设备获取第一对应关系，所述第一对应关系包括组播源组(S，G)信息和至少一个下一跳，所述至少一个下一跳中的任一下一跳是计算获得的与所述拓扑标识对应的一台设备。本申请提供的技术方案能够满足组播业务的SLA。