Configuration / Advanced / STP Params Help

RSTP (802.1W) is an evolution of the Spanning Tree Protocol (STP, IEEE 802.1D). STP links network segments and eliminates one of the difficulties of configuring bridge topologies — bridge loops. There still can only be one active path. Once RSTP is configured for a bridged network the Spanning Tree Algorithm (STA) analyzes the network and determines which links should be active or not. The STA defines the links by configuring the ports.

In the bridged network the root bridge is selected. The STA sends out messages — Bridge Protocol Data Units (BPDU) — to determine the least cost path to the root bridge. From this analysis the port roles are determined.

To edit the global STP settings, click the Edit button.

Profile

Name

This name is used for Multiple Spanning Tree Protocol (MSTP). Use the name of the bridge as a key. Not currently supported.

Revision

This setting is used if you are running MSTP. Not currently supported.

Bridge Priority

The priority ID that is to be advertised for this bridge.

Force Version

The protocol to initiate with.

Values:

2: RSTP

0: STP

Fwd Delay

The delay used by STP bridges to transition Root and Designated Ports to Forwarding.

Hello Time

The interval between periodic transmissions of Configuration Messages by Designated Ports.

Migrate Time

The initial value of the mdelayWhile and edgeDelayWhile timers.

Tx Hold Count

The transmit hold count is used by the Port Transmit state machine to limit transmission rate.

Max Age

The maximum age of the information transmitted by the bridge when it is the Root Bridge.

 

December 6, 2011