How does STP determine priority?

How does STP determine priority?

To verify the bridge priority of a switch, use the show spanning-tree command. In Example 3-4, the priority of the switch has been set to 24,576. Also notice that the switch is designated as the root bridge for the spanning-tree instance.

Why is STP priority 4096?

The priority range is 0 to 61440 in increments of 4096. The default is 32768. The lower the number the more likely the switch will be chosen as the root switch. Valid priority values are multiples of 4096.

What is the default STP priority?

32768
The default priority is 32768, and additional roots are set below this number. STP increments priority by 4096, so the next priority is 4096 below 32768. The lower the number, the higher the priority.

What is STP port priority?

When a loop occurs in a network topology, spanning tree can use the port priority value for the ports to decide which port must be put in forwarding state. The port priority is only used to determine the topology if the loop in the network cannot be resolved using bridge IDs or path cost.

Is STP enabled by default?

STP is enabled by default on devices running Layer 2 code. STP is disabled by default on devices running Layer 3 code. You can enable or disable STP on the following levels: Globally – Affects all ports and port-based VLANs on the device.

How does STP protocol work?

STP uses the Spanning-Tree Algorithm (SPA) to create a topology database of the network. To prevent loops, SPA places some interfaces in forwarding state and other interfaces in blocking state. all switches in a network elect a root switch. All working interfaces on the root switch are placed in forwarding state.

How do I change STP priority?

We can change the Spanning Tree Port Priority value, using the interface configuration commad “spanning-tree vlan port-priority “, as shown below. You may change the Spanning Tree Port Priority value only in increments of 16.

How do you configure STP?

How to configure STP?

1. STP configuration. Enter Global Configuration mode: switch# configure terminal.
2. Root Guard configuration. The Root Guard feature is responsible for verifying if the port on which it was enabled is a designated port.
3. STP configuration verification.

How do I turn on STP?

Select the network location for which you want to enable or disable STP. Select Wired > Settings > Spanning Tree. Under Spanning Tree Mode, select Disable, STP, or RSTP. Tap Save.