Configuring Spanning Tree Path Cost Support for 802.1D 2004

Devices running Spanning Tree Protocol (STP) with higher speed ports (above 40 Gbps) can be configured to use more granular path costs as outlined by the 802.1D 2004 standards. To avoid contention with ports running STP path costs using the 802.1D 1998 standards, a CLI command is entered in global configuration mode to force all ports running STP to use the 802.1D 2004 path costs.

  1. Enter global configuration mode. 
    device# configure terminal
  2. Configure all ports running STP globally to use the 802.1D 2004 path costs. 
    device(config)# spanning-tree path-cost-method long

The following example configures all ports running STP globally to use the 802.1D 2004 path cost method. 

device# configure terminal
device(config)# spanning-tree path-cost-method long
Parent topic: Spanning Tree Path Cost Support for 802.1D 2004