| 摘要 |
A method, an apparatus and a system for tracing a layer-2 multicast path are provided in the present invention, which belong to the communications field. The embodiment of the method for tracing the layer-2 multicast path includes: obtaining a path trace request message; determining port instance states of multicast member ports of a layer-2 multicast forwarding table; if there is a non-UserEdge state in the port instance states, adding a Media Access Control (MAC) address to the path trace request message and transmitting the path trace request message to a downstream device via the port instance which is in the non-UserEdge state; if all the port instance states are UserEdge states, finishing the path trace request message, adding a MAC address to the path trace request message, obtaining, from the path trace request message, the multicast path information from the corresponding device of the NetEdge state port instance to the corresponding device of the UserEdge state port instance and transmitting the multicast path information to a query device. The embodiment of the present invention can reduce operation and maintenance costs and improve efficiency. |
