Link multiplexing mechanism utilizing path oriented forwarding

A method of forwarding a high speed packet stream to a plurality of subports of lesser speed in a network device within a label switching network, said method comprising the steps of:

• assigning a unique Media Access Control (MAC) address to each subport;
• provisioning inbound traffic to one or more subports in accordance with a label switched path and transmitting resultant subport assignments to an upstream node, said upstream node in communication with said network device via a communications link;
• forwarding each outbound packet to be transmitted to a subport in said upstream node in accordance with the label associated with said outbound packet previously assigned by said downstream node;
• setting the source MAC address of each outbound packet to the MAC address of its corresponding provisioned subport;
• aggregating the output of a plurality of subports at said upstream node into a high speed packet stream and forwarding said high speed packet stream over said communications link;
• and
• forwarding inbound packets received by said network device over said communications link from said upstream node to one of said plurality of subports in accordance with the source MAC address of each inbound packet.

An apparatus for forwarding a high speed packet stream to a plurality of subports of lesser speed in a label switching network, comprising:

• a line interface coupled to a communications link and adapted to transmit and receive a high speed packet stream thereon;
• a plurality of subports, each subport of lesser speed than said line interface;
• means for provisioning inbound traffic on a downstream node to a plurality of subports in accordance with a label switched path and transmitting resultant subport assignments to an upstream node, said upstream node in communication with said downstream node via a communications link;
• a subport forwarding module in communication with said line interface and said plurality of subports, said subport forwarding module adapted to receive outbound packets from said plurality of subports, each outbound packet assigned to a subport in accordance with the label associated therewith, to aggregate said outbound packets into a high speed packet stream, to forward said high speed packet stream to said line-interface for transmission over said communications link and to forward inbound packets received over said communications link to one of said plurality of subports in accordance with the label associated with each said inbound packet.

A network device for use in a label switching network, comprising:

• a switching fabric;
• a line interface adapted to interface to one or more data links;
• a plurality of subports, each subport of lesser speed than the speed of said line interface;
• a memory for storing executable program code;
• a central processor programmed to execute said program code stored in said memory, wherein the program code further comprises code for provisioning inbound traffic to one or more subports in accordance with a label switched path and transmitting resultant subport assignments to an upstream node, said upstream node in communication with said network device via said one or more data links;
• and
• a subport forwarding module in communication with said line interface and said plurality of subports, said subport forwarding module further comprising means for receiving outbound packets from said plurality of subports, each outbound packet assigned to a subport in accordance with the label associated therewith, aggregating said outbound packets into a high speed packet stream, forwarding said high speed packet stream to the line-interface for transmission over said one or more data links and for forwarding inbound packets received over said one or more data links to one of said plurality of subports in accordance with the label associated with each said inbound packet.

A network device for use in a label switching network, comprising:

• a switching fabric;
• a line interface adapted to interface to one or more data links;
• a plurality of subports, each subport of lesser speed than the speed of said line interface;
• a memory for storing executable program code;
• a central processor programmed to execute said program code stored in said memory, wherein said program code further comprises:
• program code adapted to assign a unique Media Access Control (MAC) address to each subport;
• program code to provision inbound traffic to one or more subports in accordance with a label switched path and transmitting resultant subport assignments to an upstream node, said upstream node in communication with network device via said one or more data links;
• a subport forwarding module in communication with said line interface and said plurality of subports, said subport forwarding module further comprising:
• means for receiving outbound packets from said plurality of subports, each outbound packet assigned to a subport in accordance with the label associated therewith;
• means for setting the source MAC address field of each outbound packet to the MAC address of its assigned subport;
• means for aggregating the output of a plurality of subports into a high speed packet stream and forwarding said high speed packet stream over said one or more data links;
• and
• means for forwarding inbound packets received over said one or more data links to one of said plurality of subports in accordance with the source MAC address field of each said inbound packet.

A computer program product comprising a computer readable medium having computer readable program code means embodied in said medium, characterized by that upon loading said code means into computer memory a process for performing forwarding of packets to a plurality of subports is executed, said computer program product comprising:

• computer readable program code means for provisioning inbound traffic on a downstream node to one or more subports in accordance with a label switched path and transmitting resultant subport assignments to an upstream node, said upstream node in communication with said downstream node via a communications link;
• computer readable program code means for forwarding each outbound packet to be transmitted to a subport in said upstream node in accordance with the label associated with said outbound packet previously assigned by said downstream node;
• computer readable program code means for aggregating the output of a plurality of subports at said upstream node into a high speed packet stream and forwarding said high speed packet stream over said communications link;
• and
• computer readable program code means for forwarding inbound packets transmitted by said upstream node and received over said communications link by said downstream node to a subport in accordance with the label associated with said inbound packet.