Nippon Telegraph and Telephone Corporation

Shigemasa Kumagawa

Ken Takahashi

Ryuma Senoo

Kazuto Toyozumi

There is provided route control with excellent flexibility even in a large-scale multicast transfer system. A multicast transfer system transfers a multicast packet arriving at a plurality of destinations between multicast communication devices, and a packet transfer processing unitof the multicast communication devicetransfers, when an interface of a multicast communication deviceadjacent to itself is specified as a transfer destination of a received multicast packet, the multicast packet to the specified interface, and transfers, when the interface of the multicast communication deviceadjacent to itself is not specified as the transfer destination of the received multicast packet, the multicast packet to an interface to a multicast communication devicespecified as the destination.

Communication device, multicast transfer system, and multicast transfer method

Implementations are directed to performing path switching quickly and efficiently when path switching is required in a multicast transfer system. In a multicast transfer system, a multicast group for transmitting the same packet from a sender (transmitting apparatus) to a plurality of receivers (receiving apparatuses) is formed. A transfer apparatus holds transfer destination data in which a group identifier for identifying a multicast group is associated with copy transfer destination information (multicast segment) for specifying another transfer apparatus to be used as a packet transfer destination when the packet is received. In copy transfer destination information, a plurality of other transfer apparatuses can be registered by adding a priority, and a plurality of group identifiers can be associated with a single piece of copy transfer destination information.

Multicast transfer system and multicast transfer method

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 Tindicating, 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 Tsetting 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.

Transfer device and transfer method

[Problem] To allocate IFs to be used in accordance with buffers such that no packet loss occurs in a case in which the transfer apparatus that performs packet transfer includes as many buffers with grouped interfaces (IFs) mounted in units of groups thereon as the number of groups. [Solving Means] A packet transfer apparatusC has a plurality of buffersa ton mounting IFs in units of groups and performs, when the traffic amount at the time of packet transfer of the IFs of each of the buffers exceeds maximum transfer capacity of the IFs, buffering packets corresponding to the exceeding traffic amount in the buffers. An IF allocation unitincluded in the transfer apparatusC selects, in a case in which IF groups with no occurrence of any loss indicating packet discarding are present at the time of the packet transfer in the IFs for a unit time from among all the IF groups, an IF group with a longest non-occurrence time of the buffering from among the IF groups with no occurrence of any loss and performs IF allocation of allocating traffic of packets to the IFs in the selected IF groups.

Transmission device and resource allocation method

[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)includes: a packet reception unitthat receives packets from a PE (router); an information update unitthat updates a parameter related to the service type included in the received packet according to the PEand the virtual private network, and stores the updated parameter in the service-type information storage unit; an information conversion unitthat refers to the service-type information storage unitand converts the parameter related to the service type of the source PEof the packet into a parameter related to a service-type of the destination PEin an identical virtual private network; and a packet transmission unitthat transmits a packet including the converted parameter to the destination PE

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Musashino, Japan

Shigemasa Kumagawa