US 6,275,494 B1 · Packet switching system, packet switching network and packet switching method

Abstract

Upon initialization, a VPC is set up between edge nodes. A control processor of each node creates an IP address/VPC mapping table using IP routing information and an address mapping table mapping correspondence between IP addresses and ATM addresses and supplied by a network management system. A gateway assigns a VCC to each packet input to the network. A sending-side edge node inputs the packet to the VPC corresponding to its destination by referring to the IP address/VPC mapping table. A transit node performs packet switching over VP. A receiving-side edge node transfers each packet to the gateway corresponding to its destination. If a series of packets meet a predetermined condition in a given edge node, its control processor sends VCC information to input interfaces of the edge node so that the packets are switched by an ATM switch in the edge node without intervention of the control processor.

Claims9

Dependent claims

A packet switching system comprising:

switching means accommodating a plurality of input Asynchronous Transfer Mode (ATM) lines and a plurality of output ATM lines;
packet destination determining means for determining a destination of a packet on a routing protocol;
cell assembling means for assembling ATM cells from the packet;
packet reassembling means for reassembling said ATM cells to a reassembled packet;
packet assigning means for assigning the packet to one of said plurality of output ATM lines according to a content of a header of the packet;
Virtual Path Connection (VPC) setting means for setting up a VPC among a plurality of packet switching systems;
Virtual Channel Connection (VCC) allocating means for allocating an idle VCC existing in said VPC to a plurality of packets having an identical part in said content of said header;
and
mapping means for mapping correspondence between a packet destination address and said VPC,
wherein after a first packet of said plurality of packets having the identical part in said content of said header has been transferred by said packet destination determining means, a second packet and subsequent packets of said plurality of packets having the identical part in said content of said header are switched solely by said switching means without intervention of said packet destination determining means.

7 more elements

A packet switching network for switching a packet on a routing protocol comprising:

a first packet switching system;
and
a second packet switching system,
wherein said first packet switching system comprises:
first switching means accommodating a plurality of input Asynchronous Transfer Mode (ATM) lines and a plurality of output ATM lines,
packet destination determining means for determining a destination of the packet on said routing protocol,
cell assembling means for assembling ATM cells from the packets,
packet reassembling means for reassembling said ATM cells to a reassembled packet,
first Virtual Path Connection (VPC) setting means for setting up a VPC among a plurality of packet switching systems,
mapping means for mapping correspondence between a packet destination address and said VPC, and
Virtual Channel Connection (VCC) allocating means for allocating an idle VCC existing in said VPC to a plurality of packets having an identical part in a content of a header;
wherein said second packet switching system comprises:
second switching means accommodating said plurality of input ATM lines and said plurality of output ATM lines, and
second VPC setting means for setting up said VPC among said plurality of packet switching systems;
wherein said first and second packet switching systems are located in the peripheral part and in the inner part of said packet switching network respectively;
and
wherein, after a first packet of said plurality of packets having the identical part in said content of said header inputted to said first packet switching system has been transferred by said packet destination determining means, a second and subsequent packets of said plurality of packets having the identical part in said content of said header inputted to said first packet switching system and said plurality of packets having the identical part in said content of said header inputted to said second packet switching system are switched solely by said first switching means and said second switching means respectively without intervention of said packet destination determining means.

14 more elements

A packet switching method for switching a packet using a packet switching system on a routing protocol, said packet switching method comprising the steps of:

storing correspondence between a destination and an output line of each of Asynchronous Transfer Mode (ATM) cells inputted to said packet switching system and a Virtual Channel Connection (VCC) into first storing means;
storing correspondence between a destination address and a Virtual Path Connection (VPC) into second storing means on said routing protocol;
storing correspondence between a part of a header of the packet and said VCC existing in said VPC into third storing means;
switching said ATM cells by use of an ATM switch based on the destination stored in said first storing means upon receipt of said ATM cells which are assembled from the packet;
reassembling said ATM cells to a reassembled packet;
retrieving said correspondence between the part of the header of the packet and said VCC from said third storing means;
assembling said ATM cells from the packet if the correspondence to the part of the header of the packet is stored in said third storing means, said ATM cells being transferred by use of said ATM switch over said VCC registered for the correspondence to the packet, which is designated as a first VCC;
retrieving said correspondence between said destination address and the VPC from said second storing means if the correspondence to the part of the header of the packet is not stored in said third storing means, wherein VPC corresponding to said destination address is assigned said VCC which is designated as a second VCC, the correspondence between the part of the header of the packet and said second VCC is stored into said third storing means, and said ATM cells are assembled from the packet and are transferred by use of said ATM switch over said second VCC;
setting said VCC that corresponds to the destination and the output line of each of said plurality of ATM cells which are assembled from the packet as a VCC for cut-through by updating said first storing means after the correspondence between the part of the header of the packet and said second VCC has been stored into said third storing means;
retrieving said correspondence between said destination and the output line from said first storing means upon receipt of said ATM cells which are assembled from the packet;
and
transferring said ATM cells by use of said ATM switch over said second VCC if the destination and the output line of each of said ATM cells which are received corresponds to said VCC for cut-through.

9 more elements

A packet switching network for switching a packet on a routing protocol, comprising:

a first packet switching system;
and
a second packet switching system,
wherein said first packet switching system comprises:
first switching means accommodating a plurality of input ATM (Asynchronous Transfer Mode) lines and a plurality of output ATM lines,
packet destination determining means for determining the destination of the packet on said routing protocol,
cell assembling means for assembling ATM cells from the packet,
packet reassembling means for reassembling said ATM cells to a reassembled packet,
first VPC (Virtual Path Connection) setting means for setting up a VPC among a plurality of packet switching systems,
mapping means for mapping correspondence between a packet destination address and said VPC, and
VCC (Virtual Channel Connection) allocating means for allocating an idle VCC existing in said VPC to a plurality of packets having an identical part in a content of a header;
wherein said second packet switching system comprises:
second switching means accommodating said plurality of input ATM lines and said plurality of output ATM lines;
and second VPC setting means for setting up said VPC among said plurality of packet switching systems;
wherein said first packet switching system is located in the peripheral part of said packet switching network, and said first packet switching system and said second packet switching system are located in the inner part of said packet switching network;
and
wherein, after a first packet of said plurality of packets having the identical part in said content of said header inputted to said first packet switching system has been transferred by said packet destination determining means, a second and subsequent packets of said plurality of packets having the identical part in said content of said header inputted to said first packet switching system and said plurality of packets having the identical part in said content of said header inputted to said second packet switching system are switched solely by said first switching means and said second switching means respectively without intervention of said packet destination determining means.

14 more elements

A packet switching network for switching a packet on a routing protocol, comprising:

a first packet switching system;
and
a second packet switching system,
wherein said first packet switching system comprises:
first switching means accomodating a plurality of input ATM (Asynchronous Transfer Mode) lines and a plurality of output ATM lines,
packet destination determining means for determining the destination of the packet on said routing protocol,
cell assembling means for assembling ATM cells from the packet,
packet reassembling means for reassembling said ATM cells to a reassembled packet,
first VPC (Virtual Path Connection) setting means for setting up a VPC among a plurality of packet switching systems,
mapping means for mapping correspondence between a packet destination address and said VPC, and
VCC (Virtual Channel Connection) allocating means for allocating an idle VCC existing in said VPC to a plurality of packets having an identical part in a content of a header;
wherein said second packet switching system comprises:
second switching means accomodating said plurality of input ATM lines and said plurality of output ATM lines, and
second VPC setting means for setting up said VPC among said plurality of packet switching systems;
wherein said first packet switching system is located in the peripheral part of said packet switching network, and said first packet switching system and said second packet switching system are located in the inner part of said packet switching network;
and
wherein said VPC is formed by multiplexing VCCs having a QOS (Quality of Service) identical to the others.
first switching means accommodating a plurality of input ATM (Asynchronous Transfer Mode) lines and a plurality of output ATM lines,
packet destination determining means for determining the destination of the packet on said routing protocol,
cell assembling means for assembling ATM cells from the packet,
packet reassembling means for reassembling said ATM cells to a reassembled packet,
first VPC (Virtual Path Connection) setting means for setting up a VPC among a plurality of packet switching systems,
mapping means for mapping correspondence between a packet destination address and said VPC, and
VCC (Virtual Channel Connection) allocating means for allocating an idle VCC existing in said VPC to a plurality of packets having an identical part in a content of a header;
wherein said second packet switching system comprises:
second switching means accommodating said plurality of input ATM lines and said plurality of output ATM lines, and
second VPC setting means for setting up said VPC among said plurality of packet switching systems;
wherein said first packet switching system is located in the peripheral part of said packet switching network, and said first packet switching system and said second packet switching system are located in the inner part of said packet switching network;
and
wherein said VPC is formed by multiplexing VCCs having a QOS (Quality of Service) identical to the others.

27 more elements

Dependencies are inferred from the claim text.

Packet switching system, packet switching network and packet switching method

Life of this patent

Packet switching system, packet switching network and packet switching method

Life of this patent

Abstract

Claims9