Which function does LDP provide in an MPLS topology?
Which function does LDP provide in an MPLS topology?
The function of the Label Distribution Protocol (LDP) in an MPLS (Multiprotocol Label Switching) topology is to enable label-switched routers (LSRs) to exchange label binding information. This information supports hop-by-hop forwarding in an MPLS network, allowing for the establishment of Label Switched Paths (LSPs). This requirement facilitates efficient and scalable routing without explicitly needing IP routing information. Therefore, LDP directly provides hop-by-hop forwarding capabilities in an MPLS topology for LSRs.
Ref: Multiprotocol Label Switching (MPLS) on Cisco Routers “… Distribution of Label Bindings … • Label Distribution Protocol (LDP) - Enables peer LSRs in an MPLS network to exchange label binding information for supporting hop-by-hop forwarding in an MPLS network. …” A. It enables a MPLS topology to connect multiple VPNs to P routers. Wrong answer. B. It provides hop-by-hop forwarding in an MPLS topology for LSRs. Correct answer. C. It exchanges routes for MPLS VPNs across different VRFs. Wrong answer. D. It provides a means for LSRs to exchange IP routes. Wrong answer.
B is correct
correct B
B is correct. The others does not make sense