Spanning Tree Port Cost

Spanning-tree Cost

The STP port path cost default value is determined from the media speed and path cost calculation method of a LAN interface

Port cost is set by the media speed.
When you configure the value , higher values will indicate higher costs.

On access ports, assign the port cost by port. On trunk ports, assign the port cost by VLAN; you can configure all the VLANs on a trunk port as the same port cost.

The EtherChannel bundle is considered as a single port. The port cost is the aggregation of all the configured port costs assigned to that channel.