Use the MST Configuration page to view and configure each MSTI (Multiple Spanning Tree Instances) on the device. MSTP (Multiple Spanning Tree Protocol) allows the creation of MSTIs based upon a VLAN or groups of VLANs. Configuring MSTIs creates an active topology with a better distribution of network traffic and an increase in available bandwidth when compared to classic STP.
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Spanning Tree MST Summary Fields
| Field | Description |
|---|---|
| MST ID | The number that identifies the MST instance. |
| Priority | The bridge priority for the spanning-tree instance. This value affects the likelihood that the bridge is selected as the root bridge. A lower value increases the probability that the bridge is selected as the root bridge. |
| # of Associated VLANs | The number of VLANs that are mapped to the MSTI. This number does not contain any information about the VLAN IDs that are mapped to the instance. |
| Bridge Identifier | A unique value that is automatically generated based on the bridge priority value of the MSTI and the base MAC address of the bridge. When electing the root bridge for an MST instance, if the bridge priorities for multiple bridges are equal, the bridge with the lowest MAC address is elected as the root bridge. |
| Time Since Topology Change | The amount of time that has passed since the topology of the MSTI has changed. |
| Designated Root | The bridge identifier of the root bridge for the MST instance. The identifier is made up of the bridge priority and the base MAC address. |
| Root Path Cost | The path cost to the designated root for this MST instance. Traffic from a connected device to the root bridge takes the least-cost path to the bridge. If the value is 0, the cost is automatically calculated based on port speed. |
| Root Port | The port on the bridge with the least-cost path to the designated root for the MST instance. |
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