What is spanning-tree PortFast?
Portfast feature causes a switch port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states.
Why is STP PortFast used?
The PortFast feature is introduced to avoid network connectivity issues. These issues are caused by delays in STP enabled ports moving from blocking-state to forwarding-state after transitioning from the listening and learning states.
When should I enable PortFast?
Any port that is directly connected to an end station cannot create bridging loops. Therefore, the port can rapidly transition to the forwarding state by skipping the learning and listening states. To enable immediate transition into the forwarding state, you can enable the STP portfast feature.
What does spanning-tree PortFast default do?
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?
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.
Should you use PortFast?
Is PortFast enabled by default?
PortFast is not enabled by default. With PortFast enabled on a port, you effectively take the port and tell spanning tree not to implement STP on that port.
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!
Can we enable PortFast on trunk ports?
It is recommended to enable PortFast only on access port types. However, PortFast can be enabled on the trunk ports by selecting the Trunk check box in the WebUI.
What is spanning tree and why use spanning tree?
Spanning tree protocol (STP) is a Layer 2 network protocol used to prevent looping within a network topology. STP was created to avoid the problems that arise when computers compete for the ability to use the shared telecommunications path on a local area network ( LAN ). When too many computers try to send at the same time, overall network performance is affected and can bring all traffic to a near halt.
Should I enable spanning tree?
All switches from Cisco ship with Spanning Tree Protocol (STP) enabled by default, but if STP is misconfigured for any reason, you can easily enable it. To enable spanning tree, connect to your switch and type spanning-tree mode while in Global Configuration mode.
What is spanning tree option?
The spanning tree protocol is a link-management protocol that provides path redundancy while preventing duplicate loops in a network. The spanning tree option is enabled or disabled on the network switch.
What is designated port in spanning tree protocol?
Root Port is the port on any Non-Root Bridge which is the best port to reach the Root Switch (Root Bridge). Hence, there is no Root Port in Root Bridge. All the ports in a Root Switch (Root Bridge) are Spanning Tree Designated Ports and will be in Spanning Tree Forwarding State.