After the LSRs have exchanged the labels, LIB, LFIB, and FIB data structures are completely populated.
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MPLS is fully functional when the IGP and LDP (or TDP) have populated all the tables:
■ Main IP routing table
Although it takes longer for LDP to exchange labels (compared with IGP), a network can use the FIB table in the meantime, so there is no routing downtime while LDP exchanges labels between adjacent LSRs.
The term LDP (Label Distribution Protocol) also applies to TDP (Tag Distribution Protocol).
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