End-to-end traffic engineering label switched paths in seamless MPLS

摘要

An aggregation node establishes a first session using a traffic-engineering label distribution protocol. The first session has a next hop adjacent to the aggregation node and positioned within a same network as the aggregation node. The aggregation node also establishes a second session using a traffic-engineering label distribution protocol, wherein the second session has a remote next hop positioned at a border between the network and a second network. The aggregation node sends a message destined for the remote next hop over the second session for establishing an end-to-end traffic engineered label switched path for a FEC specified in a label request message received from an access node, wherein the message includes the same the data indicating constraint information that was received by the aggregation node in the label request message.

主权项

1. A method comprising:
receiving, by an aggregation node, a label request message generated by an access node, wherein the label request message specifies a forwarding equivalence class (FEC) for traffic to be sent by the access node, and data that indicates constraint information for the traffic to be sent by the access node; by the aggregation node, establishing a first session for a traffic-engineering label distribution protocol with a next hop adjacent to the aggregation node and positioned within a same network as the aggregation node; by the aggregation node, establishing a second session for the same traffic-engineering label distribution protocol, wherein the second session has a remote next hop positioned at a border between the network and a second network; and sending a message destined for the remote next hop over the second session for establishing an end-to-end traffic engineered label switched path for the FEC specified in the label request message, wherein the message includes the data indicating the constraint information, which was received by the aggregation node in the label request message from the access node.