Method for redundant linking lines and wide area network node device
AssigneeFujitsu Limited
InventorTakanori Sasaki
Life of this patent
Estimating the term…
Abstract
A WAN node device includes a failure monitoring unit that monitors failure in a first LAN-side input-output unit and a second LAN-side input-output unit. If failure in the first LAN-side input-output unit or the second LAN-side input-output unit is detected, failure is notified to a switching controller. Upon receiving a failure notification, the switching controller selects a normally functioning LAN-side input-output unit. Thus, the WAN node device passes on packets to a LAN-communication linking device via either the first LAN-side input-output unit or the second LAN-side input-output unit selected by the switching controller.
Claims8
A method for redundantly linking a WAN node device that forms a WAN and a LAN-communication linking device that forms a LAN, to enable communication between the two, the method comprising:
- first selecting, using a processor, one of a plurality of WAN-side input-output steps by which packets are exchanged between the WAN and the LAN in the WAN node device, wherein a packet from the LAN to the WAN is received and a packet from the WAN to LAN is sent, by the first selected WAN-side input-output step;
- storing source terminal identification data of a packet received by the LAN-communication linking device, in association with identification data of a LAN-side input-output step at which the packet is received;
- second selecting, based on the identification data of the LAN-side input-output step stored by the storing, the LAN-side input-output step from a plurality of LAN-side input-output steps to transmit a packet from the LAN to the WAN node device;
- monitoring failure in the LAN-side input-output step;
- and
- deleting the source terminal identification data stored in association with the LAN-side input-output step when failure is detected at the monitoring.
A LAN-communication linking device, forming a LAN and redundantly linked with a WAN node device that forms a WAN, the LAN-communication linking device comprising:
- a source terminal identification data storing unit that stores therein source terminal identification data of received packets, in association with identification data of a LAN-side input-output unit that has received the packets;
- an input-output step selecting unit that transmits, by the LAN-side input-output unit selected, from a plurality of LAN-side input-outputs units, based on the identification data of the LAN-side input-output unit stored by the source terminal identification data storing unit, packets from the LAN to the WAN node device;
- a failure monitoring unit that monitors failure in the LAN-side input-output unit;
- and
- a source terminal identification data deleting unit that deletes the source terminal identification data stored in association with the LAN-side input-output unit when failure in the LAN-side input-output unit is detected using the failure monitoring unit.
A redundant linking system for redundantly linking a WAN node device that forms a WAN and a LAN-communication linking device that forms a LAN, to enable communication between the two, the system comprising:
- a switching unit that selects one of a plurality of WAN-side input-output units by which packets are exchanged between the WAN and the LAN in the WAN node device, wherein a packet from the LAN to the WAN is received and a packet from the WAN to the LAN is sent, by the WAN-side input-output unit selected by the switching unit;
- a source terminal identification data storing unit that stores therein source terminal identification data of a packet, in association with identification data of a LAN-side input-output unit that has received the packet;
- an input-output step selecting unit that transmits, by the LAN-side input-output unit selected, from a plurality of LAN-side input-output units, based on the identification data of the LAN-side input-output unit stored by the source terminal identification data storing unit, a packet from the LAN to the WAN node device;
- a failure monitoring unit that monitors failure in the LAN-side input-output unit;
- and
- a source terminal identification data deleting unit that deletes the source terminal identification data stored in association with the LAN-side input-output unit when failure in the LAN-side input-output unit is detected using the failure monitoring unit.
Dependencies are inferred from the claim text.