Configuring PVST on Cisco Switches
Per-VLAN Spanning Tree (PVST) is a Cisco proprietary protocol that allows you to run a separate instance of Spanning Tree Protocol (STP) for each VLAN on a switch. This increases network efficiency and reduces the risk of network loops in a multi-VLAN environment.
In this article, we will guide you through the process of configuring PVST on Cisco switches.
Step 1: Enable PVST
To enable PVST on a Cisco switch, you can use the following command:
Switch(config)# spanning-tree mode pvst
Step 2: Configure PVST Parameters
After enabling PVST, you can configure additional parameters such as root bridge selection, priority values, and VLAN assignments. Here are some common commands for configuring PVST parameters:
Switch(config)# spanning-tree vlan 10 root primary– Sets VLAN 10 as the primary root bridge for that VLAN.Switch(config)# spanning-tree vlan 20 priority 4096– Sets the priority value for VLAN 20 to 4096.Switch(config)# interface fastEthernet 0/1Switch(config-if)# spanning-tree portfast– Enables PortFast on a specific interface.
Step 3: Verify PVST Configuration
Once you have configured PVST, you can verify the settings using the following command:
Switch# show spanning-tree summary
This command will display a summary of the PVST configuration, including VLAN-specific information and the status of the root bridge.
Conclusion
Configuring PVST on Cisco switches is an essential task for maintaining a stable and efficient network environment. By following the steps outlined in this article, you can successfully implement PVST and improve the overall performance of your network.