The OSPF (Open Shortest Path First) protocol uses the cost to determine the best path through a network. The cost metric in OSPF is based on the bandwidth of the interface over which packets are sent. Unlike other routing protocols that may use hop counts, delay times, or even network loads as metrics, OSPF calculates the cost of a link as inversely proportional to bandwidth: the higher the bandwidth, the lower the cost. cost.
The cost of a link in OSPF is generally calculated with the formula:
Cost=Reference bandwidth / Link bandwidth
Where he reference bandwidth is a fixed value for the entire OSPF network and is typically 100 Mbps by default in many implementations, although it can be adjusted to better reflect current network speeds. He link bandwidth is the capacity of the network interface through which the OSPF connection is established.
The cost metric allows OSPF to select the fastest and most efficient routes for traffic on a network, rather than simply the routes with the fewest hops. This approach makes OSPF well suited for large, heterogeneous networks, where link speeds can vary significantly.
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