DUAL algorithm
CCNA
EIGRP Topology Table: The Complete Guide to Successors, Feasible Successors, and DUAL
The EIGRP topology table is the database that separates EIGRP from every distance-vector protocol that came before it. It holds every loop-free route an EIGRP router learns from its neighbors, not just the one it currently uses. That single design choice is why EIGRP can recover from a link failure in milliseconds instead of waiting...
CCNA
OSPF Passive Interfaces: Configuration and Best Practices
In OSPF (Open Shortest Path First), a passive interface is an interface on which the router stops sending OSPF Hello packets, while still advertising that interface’s connected network in OSPF. Because no Hellos are sent, no OSPF neighbor adjacency can form on that link — but the subnet remains reachable and advertised to the rest...