Juniper Networks, Inc.
Serverless segment routing (SR)-label distribution protocol (LDP) stitching

Abstract:

A data forwarding device belonging to both (1) a segment routing (SR) domain and (2) a label distribution protocol (LDP) domain may be used to perform a method comprising: (a) receiving, by the data forwarding device, information uniquely associated with each of one or more nodes in the LDP domain; (b) associating, for each of the one or more nodes in the LDP domain, a unique SR segment identifier (SID) with the information uniquely associated with the node in the LDP domain, to generate one or more SR SID-to-LDP node associations; and (c) transmitting the one or more SR SID-to-LDP node associations for propagation to at least one other node in the SR domain, whereby the at least one other node in the SR domain will become aware of the one or more nodes in the LDP domain. The SR-LDP border router is aware of all the nodes in SR and LDP domain including the SRGB database (base label, node label, and label range). Once the border node is configured for LDP-SR stitching it assigns one of the free SR node SID to each LDP node. Subsequently, border node will propagate this binding to all the SR nodes (e.g., using the existing IGP TLVs). One of the available bits in label binding TLV may be set to make the nodes in the SR domain aware of the LDP nodes.