OSPF backbone is the part of the OSPF network that acts as the primary path for traffic that is destined to other areas or networks. There should never be more than three tiers with a maximum of six router hops across the farthest points of the network.

To illustrate, below is an example of an External LSA in the LSDB of an OSPF router. It describes a route to the IP prefix of 192.168.165.0/24, originated by the ASBR with Router-ID 192.168.0.49. The metric of 20 is external to OSPF. The forwarding address is 0, so the route should forward to … What Are OSPF Areas and Virtual Links? - Cisco Feb 25, 2020 Liveset Database - LSDB

LSDB - What does LSDB stand for? The Free Dictionary

OSPF::LSDB::View - display OSPF database as graphviz dot

OSPF backbone is the part of the OSPF network that acts as the primary path for traffic that is destined to other areas or networks. There should never be more than three tiers with a maximum of six router hops across the farthest points of the network.

OSPF Adjacencies are Established but the OSPF Routes are Aug 05, 2019 OSPF Fundamental Terminology Explained