IS-IS SR-TE Server Mapping Advertisements

In an LDP network with gradual deployment of segment routing, there can be islands of devices that support either only LDP or only segment routing. To enable interoperability between the LDP devices and the segment routing devices, this feature introduces support for the Segment Routing Mapping Server (SRMS). When the SRMS functionality is enabled on the router, the router uses IS-IS SID/label binding TLVs to generate segment routing node-SID bindings for all LDP forwarding equivalence class (FEC) label bindings from the LDP network, for example, to advertise label bindings for all inet.3 LDP routes. These segment routing node-SID bindings are flooded across the IS-IS domain and installed by segment routing-capable routers in the MPLS data plane exactly as if the node SIDs had been advertised by the nodes themselves, and not by SRMS.