Summary
This chapter explored the communication dynamics within a network split into two distinct MPLS data planes: one running exclusively on SR-MPLS and the other solely on LDP. This transition involved removing LDP from one portion of the network, where SR-MPLS was previously introduced, effectively transitioning it to an SR-only environment.
To validate this transition, the lab investigated how Label Switched Paths (LSPs) transition between LDP and SR. It’s noted that the IOS-XR platform seamlessly handles the transition from LDP to SR LSPs. However, for SR to LDP LSPs, an additional component called the Segment Routing Mapping Server (SRMS) is necessary. The SRMS plays a vital role in generating and distributing SR labels or SIDs within the SR-MPLS network for non-SR routers, enabling the establishment of LSPs across SR and LDP domains.
Throughout the validation process, the lab ensures the smooth operation of LSPs across various MPLS domains in both directions.
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