Patent ID: 8589588

Claim:
A method of identifying domain-to-domain link based on an automatically switched optical network, wherein the automatically switched optical network includes N network layers, wherein a highest network layer of the automatically switched optical network is indicated as a first network layer, and wherein a lowest network layer of the automatically switched optical network is indicated as an Nth network layer, wherein N is an integer larger than 1, comprising: abstracting a first control domain in an Mth network layer as a first abstract node in an M−1th network layer, subtracting 1 from M, and repeating the step of abstracting, until M is equal to 2, and storing route control IDs of abstract nodes in a first node that is in the first control domain of the Mth network layer, wherein M is an integer less than or equal to N; obtaining, by the first node, route control IDs of the abstract nodes stored in a second node connected to the first node via a link by exchanging a route control ID of the abstract node in each network layer; comparing, by the first node, the route control ID of the abstract node in each network layer stored locally with the route control ID of the abstract node in a peer network layer stored in the second node respectively, to obtain a highest layer of the layers with different route control IDs, and taking the route control ID of the abstract node in the highest layer stored in the second node as a high layer opposite node address of the link; and if no route control ID in the first control domain is the same as the high layer opposite node address, determining that the link is a domain-to-domain link, wherein a speaker node in the first control domain determines whether a route control ID that is the same as the high layer opposite node address in the first control domain.