Which MPLS component is responsible for distributing labels between LSRs?
- FIB
- RIB
- CEF
- LDP
Explanation: According to the sources, label distributing protocols are the mechanisms where one Label Switch Router (LSR) informs another LSR of the label to be associated with a particular Forwarding Equivalence Class (FEC) , .
The Label Distribution Protocol (LDP) is identified as the most common standard protocol used specifically to distribute labels for IGP prefixes between adjacent routers , .
While the control plane builds the RIB (Routing Information Base) through routing protocols like OSPF or EIGRP, it is the LDP that assigns local labels to these prefixes and exchanges them over established LDP sessions to populate the LIB and LFIB tables , , .
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