Edge Port and Non-Edge Port States
As soon as a port is configured as an Edge port using the CLI, it goes into a forwarding state instantly (in less than 100 msec).
When the link to a port comes up and IEEE 802.1w detects that the port is an Edge port, that port instantly goes into a forwarding state.
If IEEE 802.1w detects that port as a non-edge port, the port state is changed as determined by the result of processing the received RST BPDU. The port state change occurs within four seconds of link up or after the hello timer expires twice on the port.