By default, IGRP chooses a route based on bandwidth and delay.
But it can support Bandwidth, Delay, Reliability, Load, MTU.
Be default OSPF uses bandwidth for its metric.
Q. How does OSPF calculate its metric or cost?
A. OSPF uses a reference bandwidth of 100 Mbps for cost calculation. The formula to calculate the cost is reference bandwidth divided by interface bandwidth. For example, in the case of Ethernet, it is 100 Mbps / 10 Mbps = 10.
The formulat is cost=10 Power 8 / bandwidth
RIP uses hop count.
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