Chapter 5 | Configuration Using the |
Topology Changes Counts The total amount of STP state changes that have occurred.
LastTopology Change The elapsed time since the bridge was initialized or reset, and the last topographic change occurred. The time is displayed in a day hour minute second format, for example, 2 days 5 hours 10 minutes and 4 seconds.
Spanning Tree > Global STP
The Global STP screen contains global parameters for STP on the Switch.
Spanning Tree > Global STP
Global Setting
Spanning Tree State Select Enable or Disable from the
BPDU Handling Determines how BPDU packets are managed when STP is disabled on the port or Switch. BPDUs are used to transmit spanning tree information. The possible values are:
•Filtering Filters BPDU packets when spanning tree is disabled on an interface.
•Flooding Floods BPDU packets when spanning tree is disabled on an interface. This is the default value.
Path Cost Default Values The method used to assign default path costs to STP ports. The possible values are:
•Short Specifies a range of
•Long Specifies a range of
Bridge Settings
Priority Specifies the bridge priority value. When switches or bridges are running STP, each is assigned a priority. After exchanging BPDUs, the device with the lowest priority value becomes the Root Bridge. The default value is 32768. The value must be a multiple of 4096. For example, 4096, 8192, 12288, etc. The range is 0 to 65535.
HelloTime Specifies the device HelloTime (the amount of time in seconds a root bridge waits between configuration messages). The default is 2 seconds. The range is 1 to 10 seconds.
Max Age Specifies the device Maximum Age Time (the amount of time in seconds that a bridge waits before sending configuration messages). The default is 20 seconds. The range is 6 to 40 seconds.
Forward Delay Specifies the device forward delay time (the amount of time in seconds a bridge remains in a listening and learning state before forwarding packets). The default is 15 seconds. The range is 4 to 30 seconds.
Choose settings for the Hello Time, Max Age, and Forward Delay parameters so that both of the following are true:
Max Age ≥ 2 × (Hello Time + 1)
2 × (Forward Delay – 1) ≥ Max Age
Click Save Settings to save the changes, or Cancel Changes to cancel the changes.
Spanning Tree > STP Port Settings
The STP Port Settings screen allows network administrators to assign STP settings to specific interfaces.
Spanning Tree > STP Port Settings
Interface Indicates the port or LAG on which STP is enabled. Select either Port (default) or LAG, then select the interface from the
Enable STP Select this to enable STP on the port. The default is Enabled.
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