How do I add a spanning-tree PortFast to a Cisco switch?
Configure the Spanning-Tree portfast Setting
- Enter the configuration mode for the interface.
- Shut down the interface.
- Change the portfast setting.
- Review the portfast status.
- Reset the default spanning tree portfast value for the interface.
- Review the portfast status.
What is PortFast command?
Enabling the PortFast feature causes a switch or a trunk port to enter the STP forwarding-state immediately or upon a linkup event, thus bypassing the listening and learning states. The PortFast feature is enabled at a port level, and this port can either be a physical or a logical port.
What is the function of spanning-tree PortFast command?
Portfast feature causes a switch port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states.
How do I check my spanning-tree PortFast?
To view the configured Spanning Tree PortFast enabled ports, run the “show running-config” IOS command as shown below. We can see that PortFast is enabled on access ports fa0/1 to fa0/24. To display a detailed summary of interface information, run “show spanning-tree detail” command as shown below.
Does PortFast disable spanning tree?
A common misunderstanding among Cisco students is that portfast disables spanning-tree on a certain interface. This is not correct however…if you enable portfast on an interface then it will jump to the forwarding state of spanning-tree. We still run spanning-tree on the interface!
How do I enable spanning tree on a Cisco switch?
Step 1 – enabling STP
- switch>enable – It is used to enter privileged mode.
- switch#configure terminal – It is used to enter the switch management interface.
- switch(config)#spanning-tree vlan vlan-id – We use this command to enable the spanning tree protocol on our VLAN.
Which two commands can be used to enable PortFast on a switch?
Explanation: BPDU guard can be enabled on all PortFast-enabled ports by using the spanning-tree portfast bpduguard default global configuration command. Alternatively, BPDU guard can be enabled on a PortFast-enabled port through the use of the spanning-tree bpduguard enable interface configuration command.
Should I use Spanning Tree Portfast?
PortFast feature should be used only to connect a single workstation to a switch port to avoid layer 2 switching loop. Spanning Tree PortFast feature causes a port to enter the forwarding state immediately, bypassing the listening and learning states.
What is Spanning Tree Portfast default?
The spanning-tree portfast default global configuration mode command enables PortFast on all non-trunking interfaces. To configure BPDU guard on a Layer 2 access port, use the spanning-tree bpduguard enable interface configuration mode command, as shown in Example 3-6.
Should I use spanning tree PortFast?
Who benefits from PortFast?
It allows a device connected to this port to access the network without waiting for STP convergence on each VLAN. It minimizes the time that trunk ports must wait for spanning tree to converge.
When should I use Portfast?
How to configure spanning tree on Cisco switches?
• To configure Spanning Tree Protocol (STP) PortFast on a Switch running IOS, run “spanning-tree portfast” command as shown below. omnisecu.com.SW1> enable omnisecu.com.SW1# configure terminal Enter configuration commands, one per line.
What is the default spanning tree protocol used in Cisco?
Introduction. Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches.
What is spanning tree and why use spanning tree?
The Spanning Tree Protocol ( STP) is a network protocol that builds a loop-free logical topology for Ethernet networks. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them. Spanning tree also allows a network design to include backup links providing fault tolerance if an active link fails.
How to configure portfast on Cisco switch step by step?
Use the physical devices or create the following topology using a simulator,such as Cisco Packet Tracer or GNS3,but do not interconnect the devices now.