Understanding OSPF

Open Shortest Path First is using Djikstra's shortest path first algorithm. It is a link-state routing protocol, another link-state routing protocol is Intermediate System to Intermediate System also known as IS-IS. General facts about OSPF 1. Uses its own transport protocol number 89. Protocol number 89 indicates that this packet is destined for OSPF. 2. … Continue reading Understanding OSPF

Routing table – a router’s decision

How router chooses a route. A router that has multiple exit to a destined network will decide which route will be in routing table by these: 1st: Choose the route that has the longest prefix match. 2nd: Choose the route that has the lowest administrative distance.¬†Administrative distance is a value a router uses to trust … Continue reading Routing table – a router’s decision