Establishing and Protecting Label Switched Paths Across Topology-Transparent Zones

摘要

A label switched path (LSP) establishing method comprising receiving a first path message from a network node outside of a topology-transparent zone (TTZ) along a path for the LSP, computing a TTZ path through the TTZ from the network component to an egress TTZ edge node along the LSP, sending a second path message to a TTZ internal node along the TTZ path, receiving a first reservation (RESV) message from the TTZ internal node that comprises a label allocated for the egress TTZ edge node, and sending a second RESV message that comprises a label allocated for the network component and the label allocated for the egress TTZ edge node to the network node.

主权项

1. In a network component, a method for establishing a label switched path (LSP), the method comprising:
receiving a first path message from a network node outside of a topology-transparent zone (TTZ) along a path for the LSP; computing a TTZ path through the TTZ from the network component to an egress TTZ edge node along the LSP; sending a second path message to a TTZ internal node along the TTZ path; receiving a first reservation (RESV) message from the TTZ internal node that comprises a label allocated for the egress TTZ edge node; and sending a second RESV message that comprises a label allocated for the network component and the label allocated for the egress TTZ edge node to the network node, wherein the LSP crosses a plurality of network domains and the TTZ.