What is spanning-tree port Fast edge?

Beginning with Cisco IOS Release 12.2(33)SXI, you can specifically configure a spanning tree port as either an edge port, a network port, or a normal port. STP PortFast causes a Layer 2 LAN port configured as an access port to enter the forwarding state immediately, bypassing the listening and learning states.

What does Portfast edge do?

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 Cisco edge port?

From one of those what i understand is, The edge port is a portfast with BPDU guard and BPDU filtering which loses its portfast status upon receiving a BPDU.. but the normal stp portfast will remains in the portfast state as long as the portfast is disabled manually.

What is spanning-tree Portfast command?

Portfast feature causes a switch port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states.

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!

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.

Do access ports send BPDUs?

all access ports or be configured directly under the interface. it will continue to use portfast and bridging loops may appear. Part of the myth is also that portfast enabled ports do not send BPDUs. BPDUs are still sent on portfast enabled ports.

Does edge port send BPDU?

With the edge-port status which defaults to on for RSTP, it can automatically change to off if it detects another switch there. It’s in this situation that you really need spanning-tree to keep sending out BPDU’s on all ports if a loop was created on this other switch.

What happens if a edge port receives a BPDU?

After BPDU protection is enabled on a switch, if an edge port on the switch receives a BPDU, the switch will shut down the edge port, while keeping the port attribute unchanged. This ensures that the spanning tree topology is not recalculated and services are not interrupted.

How do you enable port Fast on a Cisco switch?

Configure the Spanning-Tree portfast Setting

1. Enter the configuration mode for the interface.
2. Shut down the interface.
3. Change the portfast setting.
4. Review the portfast status.
5. Reset the default spanning tree portfast value for the interface.
6. Review the portfast status.

What is spanning-tree mode rapid Pvst?

Rapid per VLAN Spanning Tree (Rapid PVST+) is an updated implementation of STP that allows you to create one spanning tree topology for each VLAN. Rapid PVST+ is the default Spanning Tree Protocol (STP) mode on the switch. Spanning tree is used to refer to IEEE 802.1w and IEEE 802.1s.

What is a spanning tree normal port?

A spanning tree normal port is one that functions in the default manner for spanning tree. Under normal circumstances it will transition from the Listening, Learning, Forwarding stages based on the default timers. Also i read the lessons on both spanning-tree uplinkfast and spanning-tree backbonefast.

What is the difference between STP portfast and edge port?

From one of those what i understand is, The edge port is a portfast with BPDU guard and BPDU filtering which loses its portfast status upon receiving a BPDU.. but the normal stp portfast will remains in the portfast state as long as the portfast is disabled manually.

How does portfast BPDU guard prevent spanning tree loops?

Because PortFast can be enabled on nontrunking ports connecting two switches, spanning tree loops can occur because BPDUs are still being transmitted and received on those ports. PortFast BPDU guard prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port.

What is portfast mode in Cisco switch?

When you enable PortFast on a switch or trunk port, the port is immediately transitioned to the spanning tree forwarding state. To prevent loops from occurring in a network, the PortFast mode is supported only on nontrunking access ports because these ports typically do not transmit or receive BPDUs.