Packet transmission apparatus, line interface unit, and control method for packet transmission apparatus
AssigneeFujitsu Limited
InventorTamotsu Matsuo
Life of this patent
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Abstract
A packet transmission apparatus includes: a plurality of communication ports; a switch for switching packets; a storage unit which stores a plurality of queues for respectively holding packets to be output from the plurality of communication ports; and a stop signal generating unit. The stop signal generating unit generates a stop signal for stopping packets directed to one of the communication ports from being input into the switch, if the amount of packets held in the queue for the one communication port is equal to or larger than a certain first threshold value, and if the sum of the amounts of packets held in the plurality of queues is equal to or larger than a certain second threshold value.
Claims7
A packet transmission apparatus comprising:
- a plurality line interface units;
- and
- a switch for switching packets between said plurality of line interface units, wherein
- a line interface unit comprises:
- a plurality of communication ports;
- a storage unit which stores a plurality of queues for respectively holding packets to be output from said plurality of communication ports;
- and
- a stop signal packet generating unit which generates a stop signal packet which is transmitted to another one of said line interface units via said switch, if the amount of packets held in said queue for said one communication port is equal to or larger than a certain first threshold value, and if the sum of the amounts of packets held in said plurality of queues is equal to or larger than a certain second threshold value, wherein said stop signal packet stops said another one of said line interface units from inputting packets directed to one of said communication ports into said switch.
A line interface unit which is provided in a packet transmission apparatus having a switch for switching packets between a plurality of lines, and which performs interface control for said packets between said lines and said switch, said line interface unit comprising:
- a plurality of communication ports connected to said plurality of lines;
- a storage unit which stores a plurality of queues for respectively holding packets to be output from said plurality of communication ports;
- and
- a stop signal packet generating unit which generates a stop signal packet which is transmitted to another line interface unit via said switch, if the amount of packets held in said queue for said one communication port is equal to or larger than a certain first threshold value, and if the sum of the amounts of packets held in said plurality of queues is equal to or larger than a certain second threshold value, wherein said stop signal packet stops said another line interface unit from inputting packets directed to one of said communication ports into said switch.
A control method for a packet transmission apparatus, wherein said packet transmission apparatus includes a plurality of line interface units, and a switch for switching packets between said plurality of line interface units, and wherein a line interface unit includes a plurality of communication ports and a storage unit which stores a plurality of queues for respectively holding packets to be output from said plurality of communication ports, said control method comprising;
- comparing the amount of packets held in each of said queues for said communication ports with a certain first threshold value, and comparing the sum of the amounts of packets held in said plurality of queues with a certain second threshold value;
- generating a stop signal packet for stopping another one of said line interface units from inputting packets directed to one of said communication ports into said switch, if the amount of packets held in said queue for said one communication port is equal to or larger than said certain first threshold value, and if the sum of the amounts of packets held in said plurality of queues is equal to or larger than said certain second threshold value;
- and
- transmitting said stop signal packet to said another one of said line interface units via said switch.
Dependencies are inferred from the claim text.