Back to results
US 2003/0118036 A1Published application
Routing traffic in a communications network
AssigneeNortel Networks Limited
InventorsMark Gibson, Roy Mauger, Dave Stacey
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNortel Networks Limited
InventorsMark Gibson, Roy Mauger, Dave Stacey
Estimating the term…
In a packet communications network system, a border gateway protocol is employed to route an information packet from a source in a first autonomous system via a first label switched path to a destination in a second autonomous system via first and second border routers at an interface between the first and second autonomous systems. A label stack attached to the packet identifies both a forwarding interface for the packet and a forwarding behaviour at that interface. This provides a mapping from the first label switched path on to a second label switched path to the destination in the second autonomous system. Preferably, the destination router in the second autonomous system returns to the source router in the first autonomous system a two-label stack identifying first and second paths across the first and second autonomous systems respectively.
A method of routing an information packet from a source in a first autonomous system via a first label switched path to a destination in a second autonomous system via a second label switched path, the method comprising;
A method of routing an information packet from a source router in a first autonomous system via a first label switched path to a destination router in a second autonomous system via first and second border routers at an interface between said first and second autonomous systems, wherein a border gateway protocol (BGP) is employed in which a label identifies both a forwarding interface for a packet and a forwarding behaviour at that interface so as to provide a mapping from said first label switched path on to a second label switched path to the destination in said second autonomous system.
A communications network comprised by a plurality of interconnected autonomous systems and in which information packets are routed from a source in a first autonomous system via a first label switched path to a destination in a second autonomous system via first and second border routers at an interface between said first and second autonomous systems, wherein the communications network employs a border gateway protocol (BGP) in which a label identifies both a forwarding interface for a packet and a forwarding behaviour at that interface so as to provide a mapping from said first label switched path on to a second label switched path to the destination in said second autonomous system.
Dependencies are inferred from the claim text.