# Viewing RSTP general information

Use this procedure to view general information about Rapid Spanning Tree Protocol (RSTP) when RSTP is in active mode.

## Procedure steps

1. From the navigation tree, double-click VLAN.

2. From the VLAN tree, double-click Spanning Tree.

3. From the Spanning Tree folder, click RSTP.

4. Select the Globals tab.

## Variable definitions

The following table outlines the parameters of the Globals tab.

Table 1. RSTP Globals tab parameters
Variable | Value
--- | ---
PathCostDefault | Sets the version of the Spanning Tree default Path Costs that the Bridge uses. The value of 16-bit uses the 16-bit default Path Costs from IEEE Std. 802.1D-1998. A value of 32-bit uses the 32-bit default Path Costs from IEEE Std. 802.1t.
TXHoldCount | The value used by the Port Transmit state machine to limit the maximum transmission rate. The value can range from 1 to 10.
Version | The version of the Spanning Tree Protocol the bridge is currently running: stpCompatible: indicates that the bridge uses the Spanning Tree Protocol specified in IEEE 802.1D. rstp: indicates that the bridge uses the Rapid Spanning Tree Protocol specified in IEEE 802.1w.
Priority | The value of the writable portion of the Bridge Identifier comprising the first two octets. The values that are set for Priority must be in steps of 4096.
BridgeMaxAge | The value in 1/100 seconds that all bridges use for MaxAge when this bridge acts as the root. The value must be a multiple of 100. The range is 600 to 4000.
BridgeHelloTime | The value in 1/100 seconds that all bridges use for HelloTime when this bridge acts as the root. The value must be a multiple of 100. The range is 100 to 1000.
BridgeForward Delay | The value in 1/100 seconds that all bridges use for ForwardDelay when this bridge is acting as the root. Note that 802.1D-1990 specifies that the range for this parameter is related to the value of BridgeMaxAge. The value must be a multiple of 100. The range is 400 to 3000.
DesignatedRoot | The unique identifier of the Bridge recorded as the Root in the Configuration BPDUs that are transmitted by the Designated Bridge for the segment to which the port is attached. Reference IEEE 802.1D-1990: Section 4.5.5.4.
RootCost | The cost of the path to the root as seen from this bridge.
RootPort | The port number of the port that offers the lowest cost path from this bridge to the root bridge.
MaxAge | The maximum age of Spanning Tree Protocol information learned from the network on any port before being discarded. The maximum age is specified in units of hundredths of a second. This is the actual value that the bridge uses.
HelloTime | The amount of time required for transmission of the configuration BPDUs by the node on any port when it is the root of the spanning tree or trying to become the root. This is specified in units of hundredths of a second. This is the actual value that the bridge uses.
ForwardDelay | This time value, measured in units of hundredths of a second, controls how fast a port changes its spanning state when moving towards the Forwarding state. The value determines how long the port stays in each of the Listening and Learning states, which precede the Forwarding state.
RstpUpCount | The number of times the RSTP Module has been enabled. A trap is generated on the occurrence of this event.
RstpDownCount | The number of times the RSTP Module has been disabled. A trap is generated on the occurrence of this event
NewRootIdCount | The number of times this Bridge has detected a Root Identifier change. A trap is generated on the occurrence of this event.
TimeSinceTopologyChange | The time (in hundredths of a second) since the TcWhile Timer for any port in this Bridge was non-zero for the Common Spanning Tree context.
TopChanges | The total number of topology changes detected by this bridge since the management entity was last reset or initialized.