LDP Architecture
Page 520 7450 ESS MPLS Guide
Communication within LDP tasks is typically done by inter-process communication through the
event queue, as well as through updates to the various data structures. The primary data structures
that LDP maintains are:
• FEC/label database — This database contains all the FEC to label mappings that include,
both sent and received. It also contains both address FECs (prefixes and host addresses) as
well as service FECs (L2 VLLs and VPLS).
• Timer database — This database contains all the timers for maintaining sessions and
adjacencies.
• Session database — This database contains all the session and adjacency records, and
serves as a repository for the LDP MIB objects.
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