MPLS Control and Data Plane Components

BC.

To build the control and data plane for MPLS Label Switched Paths (LSPs), two components are required:

1. Label Distribution Protocol (LDP)

2. Forwarding Information Base (FIB) or Label Forwarding Information Base (LFIB)

3. Label Distribution Protocol (LDP): LDP is a signaling protocol used to distribute labels to Label Switching Routers (LSRs) for building MPLS LSPs. LDP assigns labels to each forwarding equivalence class (FEC) and advertises these labels to other LSRs in the network, so that they can use them to forward packets along the LSP.

4. Forwarding Information Base (FIB) or Label Forwarding Information Base (LFIB): The FIB or LFIB is used to store the label forwarding information learned from LDP or other label distribution protocols. It is a routing table that contains information about the next hop for each labeled packet based on the label value. When an LSR receives a labeled packet, it looks up the label in its FIB or LFIB to determine the next hop and then forwards the packet accordingly.

Additional Components:

• Cisco Express Forwarding (CEF) - CEF is a high-performance switching technology that is used to forward labeled packets at high speed in the MPLS network. It can be used in conjunction with FIB/LFIB to provide high-speed packet forwarding.
• Open Shortest Path First (OSPF) - OSPF is a routing protocol that can be used to distribute labels for MPLS traffic engineering purposes. It can be used in conjunction with LDP to assign traffic to specific LSPs based on different metrics such as bandwidth, delay, and cost.

Therefore, the correct answer choices for the question are C (LDP) and D (LFIB).