Forward Delay (2 bytes) (BPDU)

Protocol: BPDU (Spanning Tree) BPDU PCI

Field: forward delay

Length: 2 bytes

Contents: time between state changes.

The current value is always set by the root bridge and then used by all other bridges, too.

This field contains the time, in 1/256ths of a second, that bridges should stay in each of the immediate states before transiting a port from blocking to forwarding.