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(also link state database)

LSDB definition

The LSDB, short for link state database, is a vital part of the OSPF (Open Shortest Path First) protocol, primarily used for routing purposes within large and complex networks. The LSDB maintains a complete network topology map, keeping information about the state of every link within that network. Every router within an OSPF network maintains its own LSDB and keeps it synced with the LSDBs of its neighboring routers.

See also: BGP, internet protocol address

LSDB examples

  • Network troubleshooting: The LSDB is crucial for network administrators in understanding and visualizing the network topology for troubleshooting and network optimization.
  • OSPF-based routing: In OSPF protocol, the router’s decision on the best route is based on the information stored in the LSDB.

Advantages and disadvantages of the LSDB


  • Accurate network topology: The LSDB maintains a comprehensive network topology, which leads to more efficient routing.
  • Scalability: OSPF, and by extension the LSDB, is ideal for large-scale networks due to its hierarchical design.


  • Complexity: OSPF and the LSDB can be complex to manage, requiring a solid understanding of network protocols.
  • Increased router processing: Keeping LSDBs in sync across all routers requires significant processing power, which can impact router performance.

Using LSDB

  • Ensure your network equipment supports OSPF and your administrators are trained in OSPF and LSDB management.

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