| 摘要 |
In a communications network which includes a subnetwork and at least one external node, each node of the subnetwork calculates virtual links from physical links of the subnetwork so that they emanate to other nodes of the subnetwork and advertises the calculated virtual links as reachable extents of each node within the subnetwork. The external node receives the advertised messages and maintains them in a database. On receiving a path setup request from a client device, the external node uses the database to determine a route to a destination and transmits a connection setup message to a border node of the subnetwork. On receiving the setup message, the border node establishes a connection over the determined route by using only one virtual link of the advertised links.
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