Abstract: In response to a band reservation request based on a VC connection request or a burst information transmission start request upon a call connection from an originating station, a switching node accommodating the originating station sends a band reservation request to a two-layer subnet manager. This two-layer subnet manager sequentially and parallelly sends band reservation requests in the direction of low hierarchical level, i.e., direction of one-layer subnetwork. The band reservations for a given link located on a desired route are performed by switching nodes located on the two sides of the given link.