Capacity field denotes the capacity of an interface. Often, the configured capacity/bandwidth of an interface can be different from the maximum bandwidth of the physical interface. Once you have configured the capacity, the capacity information is leveraged for capacity planning reports. It is important to configure the capacity of interfaces for accurate 99th and 95th utilization. Leveraging the percentile utilization helps in accurate capacity planning.

You can see interface details by simply zooming in on a network device on the topology. The topology shows the device with the bigger circle with all its interfaces within that circle. Each interface has an ingress and egress and the capacity shown is the bandwidth of that interface.