Device Online Help # Go back one pageGo to the next page#Go to this book's Index

Enabling STP

To enable STP:

  1. From the Device Manager menu bar, choose VLAN > STP.
    2. The STP dialog box opens with the Globals tab displayed.


    Field Description
    StpState
    		Indicates whether STP is enabled or disabled.
    Protocol Type
    		Specifies the protocol type (i.e., ieee802.1D).
    Priority
    		Sets the STP bridge priority, in decimal. The range is 0 (highest priority) to 65535 (lowest priority). The default is 32768.
    Last Topology Change
    		The time (in hundredths of a second) since the last topology change was detected.
    Total Topology Changes
    		The total number of topology changes detected since the management entity was last reset or initialized.
    Root Identifier
    		The bridge identifier of the spanning tree root determined by STP that is executed by this node.
    Root Cost
    		The cost of the path to the root as seen from this bridge.
    Root Port
    		The number of the port which offers the lowest cost path from this bridge to the root bridge.
    Maximum Age
    		The maximum age of the STP information learned from the network on any port before it is discarded, in units of hundredths of a second.
    Hello Interval
    		The amount of time between the transmission of configuration bridge PDUs by this node on any port when it is the root of the spanning tree or is trying to become so, in units of hundredths of a second.
    Hold Interval
    		This value determines the interval during which no more than two configuration bridge PDUs are transmitted by this node, in units of hundredths of a second.
    Forwarding Delay
    		This interval, measured in units of hundredths of a second, controls how fast a port changes its spanning state when moving towards the forwarding state.
    Bridge Maximum Age
    		The value in hundredths of a second that all bridges use for MaxAge when this bridge is acting as the root. Note: The 802.1D-1990 standard specifies that the range for this parameter is related to the value of the Bridge Hello Interval. The default is 2000 (20 seconds).
    Bridge Hello Interval
    		The value in hundredths of a second that all bridges use for HelloTime when this bridge is acting as the root. The granularity of this timer is specified by the IEEE 802.1D-1990 standard to be in increments of 1/100 of a second. The default is 200 (2 seconds).
    Bridge Forwarding Delay
    		The value in hundredths of a second that all bridges use for forward delay when this bridge is acting as the root. The default is 1500 (15 seconds).

  2. Set the StpState to enabled.
    3. Note that the Globals tab allows you to control the StpState for the entire switch. This is the first level of control. The second level occurs at the STP ports level and it allows you to control the StpState for each port. Thus, you need to enable the StpState for the switch and also enable the port status in the Port > STP tab as explained in Step 3.
  3. To enable the port status:
    1. Select a port and choose Edit > Port > STP.
      2. The STP dialog box opens.
    2. Click the Status box to enable STP and then click Apply. Note that the STP for each port is automatically generated.
  4. Enter an STP bridge priority, a Bridge Maximum Age, a Bridge Hello Interval, and a Bridge Forwarding Delay, or just accept the default values.

See also:
Go back one pageGo to the next page##Go to this book's Index