Abstract: A route calculation device (1) includes: an input unit (11) that receives input parameters including an index for selecting a path to be set in a communication system (20); a route calculation unit (12) that selects a reference path based on the index and preferentially selects, from among one or more other paths each of which passes through a route different from the reference path, a path having a lower degree of sharing a router through which the reference path passes; and a route setting unit (15) that sets the reference path and the another path selected by the route calculation unit (12) in the communication system (20).

Abstract: A transfer apparatus configured to control transfer of a packet from a transmission source node to a destination node through segment routing includes: a storage unit storing node management information T1 indicating, for each node that functions as a transmission source node or a destination node, an SID list acquisition method of the nodes; a packet reception unit for receiving a reception packet from the destination node; an information setting unit for, if a destination-side SID list acquisition method of the destination node and a transmission source-side SID list acquisition method of the transmission source node do not match each other based on the node management information T1, setting the information that is needed to execute the transmission source-side SID list acquisition method in the reception packet; and a packet transmission unit configured to transmit the reception packet that was subjected to the setting to the transmission source node.

Abstract: [Problem] A route information transfer device that transfers packets advertising route information between routers of different service types is provided. [Solution] The route reflector (route information transfer device) 1 includes: a packet reception unit 11 that receives packets from a PE (router) 2; an information update unit 120 that updates a parameter related to the service type included in the received packet according to the PE 2 and the virtual private network, and stores the updated parameter in the service-type information storage unit 13; an information conversion unit 14 that refers to the service-type information storage unit 13 and converts the parameter related to the service type of the source PE2 of the packet into a parameter related to a service-type of the destination PE 2 in an identical virtual private network; and a packet transmission unit 16 that transmits a packet including the converted parameter to the destination PE 2.

Abstract: [Problem to be Solved] Improving extensibility and flexibility of a network in which transfer through segment routing is executed.

Abstract: [Problem] A route information transfer device that transfers packets advertising route information between routers of different service types is provided. [Solution] The route reflector (route information transfer device) 1 includes: a packet reception unit 11 that receives packets from a PE (router) 2; an information update unit 120 that updates a parameter related to the service type included in the received packet according to the PE 2 and the virtual private network, and stores the updated parameter in the service-type information storage unit 13; an information conversion unit 14 that refers to the service-type information storage unit 13 and converts the parameter related to the service type of the source PE2 of the packet into a parameter related to a service-type of the destination PE 2 in an identical virtual private network; and a packet transmission unit 16 that transmits a packet including the converted parameter to the destination PE 2.