OSPF (Open Shortest Path First)calculates the best path based on thecostof the route, which is derived from the bandwidth of the interfaces along the path.
Step-by-Step Breakdown:
* OSPF Path Selection:
* OSPF assigns a cost to each link, typically based on the link's bandwidth (higher bandwidth equals lower cost).
* The OSPF algorithm computes the shortest path to a destination by adding the costs of all links in the path. The path with thenumerically lowest total costis chosen as the best path.
* Cost Calculation:The OSPF cost can be manually adjusted or automatically calculated using the default formula:
Cost=Reference BandwidthLink Bandwidth\text{Cost} = \frac{\text{Reference Bandwidth}}{\text{Link Bandwidth}}Cost=Link BandwidthReference Bandwidth Juniper Reference:
* OSPF Best Path Selection: OSPF selects the path with the lowest cumulative cost, ensuring efficient use of higher-bandwidth links in Junos networks.