Understanding Spanning Tree Portfast

When a computer or server is connected to a Switch port, it can access the network and communicate with other devices. Layer 2 Switches cause network Loops, which can be prevented by the STP protocol.

Understanding Spanning Tree Portfast

Understanding Spanning Tree Portfast

Network backup is of great importance in large corporate networks. Because a server with high traffic needs to be active on the local network or on the Internet all the time. For this reason, redundancy of the network is very important. Portfast is a Cisco-specific feature.

STP sends BPDU frames to recalculate network map when any Switch fails in a network configured with the STP protocol. It takes 50 seconds to find an alternative way to STP. You can check Spanning Tree port status for this.

For example, if there is a server connected to the Switch FastEthernet 0/0 interface, waiting for 50 seconds will result in severe time loss for this server. As a result, the server will not be able to serve for 50 seconds. In a large network, this is absolutely unacceptable.

How to Enable Portfast on Interface of Cisco Switch

For FastEthernet0/0 interface of Cisco Switch is to not join the account, this interface must be configured as PortFast.

So, what is Spanning Tree Portfast? The purpose of Spanning Tree portfast configuration is to bypass Listening and Learning steps. In short, it allows the port to enter the Forwarding mode instantly. As a result, the server connected to the Switch FastEthernet 0/0 interface will immediately join the network without waiting for 50 seconds.

Ports configured as Portfast are ports that are not connected to Switch, Hub or Bridge devices. Portfast is only used for end-user devices.

To configure a Switch port as Portfast, execute the following command on the interface.

Switch(config)# int range fastEthernet 0/0
Switch(config-if-range)# spanning-tree portfast

If you want to enable Portfast on more than one port, please execute the following command.

Switch(config)# int range fastEthernet 0/1 - 12
Switch(config-if-range)# spanning-tree portfast

How to Enable PortFast ⇒ Video

By using the Cisco Packet Tracer program, you can watch the following video to better understand how PortFast works and how to enable Spanning Tree PortFast on the Cisco Switch, and you can also subscribe to our YouTube channel!

   Final Word

The Portfast feature is unique to Cisco branded devices only. Configuring Portfast on Cisco switches is a fairly straightforward process.

   Related Articles

♦ How Switch Works?
What is Port Security?
♦ What is Trunk Port?
The Methods of Switching
♦ What is Access Port?

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