Computer system having virtual circuit address altered by local computer to switch to different physical data link to increase data transmission bandwidth

A method of controlling data transmissions between a remote node and a local node of a computer communications network, said network having a plurality of nodes interconnected for the exchange of datagrams, said local node having a plurality of physical data links connected thereto for connecting the local node to the network, said datagrams defining a plurality of virtual circuits between the local node and the remote node, each of said datagrams including either source or destination address data corresponding to one of the links and having a header comprising a plurality of words, one of said words representing the address data, another of said words in the header representing a checksum for use in error detection, said checksum being a function of the plurality of words in the header, each virtual circuit being defined by at least one local-to-remote datagram and at least one remote-to-local datagram, said method comprising the steps of:

• establishing a connection from the local node to the remote node via a first one of the links;
• assigning one of the virtual circuits to the first link;
• assigning another one of the virtual circuits to a second one of the links, said step of assigning the virtual circuit to the second link including altering the address data in each of the datagrams that define the virtual circuit assigned to the second link so that the address data corresponds to the second link rather than to the first link and altering the checksum so that the checksum is a function of the address data corresponding to the second link rather than the address data corresponding to the first link, said step of altering the address data including altering the headers of the local-to-remote datagrams so that the source address corresponds to a desired one of the links for receiving the remote-to-local datagrams regardless of the link via which the local-to-remote datagrams are transmitted;
• and
• receiving the remote-to-local datagrams of the assigned virtual circuits via their respective links whereby the collective throughput requirement of the plurality of datagrams is distributed among the plurality of links thereby increasing the speed of data transmission between the remote node and the local node.

A method of controlling data transmissions between a remote node and a local node of a computer communications network, said network having a plurality of nodes interconnected for the exchange of datagrams, said local node having a plurality of physical data links connected thereto for connecting the local node to the network, said datagrams defining a plurality of virtual circuits between the local node and the remote node, each virtual circuit being defined by at least one local-to-remote datagram and at least one remote-to-local datagram, each of said datagrams comprising a plurality of words, one of said words representing address data corresponding to one of the links, another one of said words representing a checksum for use in error detection, said method comprising the steps of:

• assigning one of the virtual circuits to a first one of the links;
• assigning another one of the virtual circuits to a second one of the links;
• altering the address data in each of the datagrams that define the virtual circuit assigned to the second link so that the address data corresponds to the second link rather than to the first link;
• and
• altering the checksum in each of the datagrams that define the virtual circuit assigned to the second link so that the checksum is a function of the address data corresponding to the second link rather than the address data corresponding to the first link.

A system for communicating with a remote node of a computer communications network, said network having a plurality of nodes interconnected for the exchange of datagrams, said system comprising:

• a local node for transmitting datagrams to and receiving datagrams from the remote node, said datagrams defining a plurality of virtual circuits between the local node and the remote node, each datagram including either source or destination address data corresponding to one of the links, each virtual circuit being defined by at least one local-to-remote datagram and at least one remote-to-local datagram;
• a plurality of physical data links connected to the local node for connecting the local node to the network;
• an interface between the local node and the links for establishing a connection from the local node to the remote node via a first one of the links, said interface assigning one of the virtual circuits to the first link and assigning another one of the virtual circuits to a second one of the links, said interface including a processor at the local node executing a software program having a plurality of routines, said processor executing a routine for altering the address data in each of the datagrams that define the virtual circuit assigned to the second link so that the address data corresponds to the second link rather than to the first link, said local node receiving the remote-to-local datagrams of the assigned virtual circuits via their respective links whereby the collective throughput requirement of the plurality of datagrams is distributed among the plurality of links thereby increasing the speed of data transmission between the remote node and the local node.

A system for communicating with a remote node of a computer communications network said network having a plurality of nodes interconnected for the exchange of datagrams said system comprising:

• a local node for transmitting datagrams to and receiving datagrams from the remote node, said datagrams defining a plurality of virtual circuits between the local node and the remote node, each of said datagrams including either source or destination address data corresponding to one of the links and having a header comprising a plurality of words one of said words in the header representing the address data another of said words in the header representing a checksum for use in error detection, said checksum being a function of the plurality of words in the header, each virtual circuit being defined by at least one local-to-remote datagram and at least one remote-to-local datagram:
• a plurality of physical data links connected to the local node for connecting the local node to the network:
• an interface between the local node and the links for establishing a connection from the local node to the remote node via a first one of the links said interface assigning one of the virtual circuits to the first link and assigning another one of the virtual circuits to a second one of the links, said interface including a processor executing a software program having a plurality of routines, said processor executing a routine for altering the address data in each of the datagrams that define the virtual circuit assigned to the second link so that the address data corresponds to the second link rather than to the first link and a routine for altering the checksum so that the checksum is a function of the address data corresponding to the second link rather than the address data corresponding to the first link, said processor further executing a routine for altering the headers of the local-to-remote datagrams so that the source address corresponds to a desired one of the links for receiving the remote-to-local datagrams regardless of the link via which the local-to-remote datagrams are transmitted, said local node receiving the remote-to-local datagrams of the assigned virtual circuits via their respective links whereby the collective throughput requirement of the plurality of datagrams is distributed among the plurality of links thereby increasing the speed of data transmission between the remote node and the local node.

In a system controlling data transmissions between a remote node and a local node of a computer communications network, said network having a plurality of nodes interconnected for the exchange of datagrams, said local node having a plurality of physical data links connected thereto for connecting the local node to the network, said datagrams defining a plurality of virtual circuits between the local node and the remote node, each virtual circuit being defined by at least one local-to-remote datagram and at least one remote-to-local datagram, each of said datagrams comprising a plurality of words, one of said words representing address data corresponding to one of the links, another one of said words representing a checksum for use in error detection, an improvement including an interface between the local node and the links comprising:

• a routine for assigning one of the virtual circuits to a first one of the links;
• a routine for assigning another one of the virtual circuits to a second one of the links;
• and
• a routine for altering the address data at the local node in each of the datagrams that define the virtual circuit assigned to the second link so that the address data corresponds to the second link rather than to the first link whereby the collective throughput requirement of the plurality of datagrams is distributed among the plurality of links thereby increasing the speed of data transmission between the remote node and the local node.