Objective
In the previous chapter, only end-to-end forwarding utilizing either SR-MPLS LSP or LDP LSP was explored. The objective of this chapter is to initially divide the topology into two distinct MPLS domains: SR-MPLS only on the left-hand side and LDP only on the right-hand side of the diagram, as illustrated in Figure 4.1.
Figure 4.1 – SR-LDP interworking
The IS-IS IGP provides end-to-end routing among all the routers in the topology, making an end-to-end LSP desirable even if the routers are in two distinct MPLS domains with different label distribution methods.
This necessitates LSP stitching, where an incoming SR-MPLS label is mapped to an outgoing LDP label, and vice versa.
This is achieved through the tasks outlined here:
- Remove LDP on the left half of the network to make it SR-only
- Examine how Label Switched Paths (LSPs) stitch from LDP to SR
- Examine how LSPs stitch from SR to LDP using Segment Routing Mapping Server...
