Dynamic establishment of virtual circuits multisegment pseudowires

摘要

The present invention provides a technique for automatically establishing a virtual circuit from one edge device to another through a core network. The virtual circuit may comprise one or more pseudowire segments. These pseudowire segments extend between adjacent edge and core devices within the core network. Pseudowire segments through the core network are automatically stitched together as a setup message is forwarded from a first edge device to a second edge device through the core network. A virtual circuit is established in one direction, and packets are forwarded in an opposite direction. With the present invention, a virtual circuit comprising any number of pseudowire segments, as well as two attachment circuits, may be established in an automatic and efficient manner upon being initiated by the first edge device.

主权项

1. A system for dynamically establishing a multi-segment pseudowire connection, comprising:
a first edge device having destination information for a second edge device and adapted to support a first attachment circuit, the first edge device being further adapted to:
identify a next hop toward the second edge device based on the destination information;create a setup message comprising a source address associated with the first edge device and the destination information;send the setup message over the next hop to initiate automatic establishment of the multi-segment pseudowire connection;associate the next hop with a first pseudowire segment between the first edge device and the next hop; andassociate the first pseudowire segment with the first attachment circuit such that packets arriving over the first pseudowire segment are forwarded over the first attachment circuit to implement part of the multi-segment pseudowire connection.