Patent ID: 7660240

Claim:
A method for implementing link state passing-through in a network, comprising the following steps: A. a service device detecting whether there is a link fault in the network; B. in the case that there is a link fault, the service device transferring link-faulty information to a remote service device in a control frame via a service network; C. in response to the received control frame containing the link-faulty information, the remote service device disconnecting a remote access point link with a remote user; D. a user at the faulty side communicating with the remote user through a spare network for said network, wherein if said link fault is an access point link fault, the service device at the faulty side sends a control frame containing access-point-link-faulty information to the remote service device; when receiving said control frame containing the access-point-faulty information, said remote service device disconnects the remote access point link with the remote user; and then, the user at the faulty side communicates with the remote user through the spare network; if said link fault is a service network fault, the service device at the faulty side sends a control frame containing service-network-faulty information to the remote service device and disconnects an access point link with the user at the faulty side; when receiving said control frame containing the service-network-faulty information, said remote service device disconnects the remote access point link with the remote user; and then the user at the faulty side communicates with the remote user through the spare network.