Where would we typically configure PortFast and BPDU guard?
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Where would we typically configure PortFast and BPDU guard?
In most deployments, BPDU Guard feature is configured over the PortFast enabled STP ports, but in this implementation the BPDU Guard feature can be enabled on any of the STP ports, with or without PortFast feature being enabled on these ports.
Can PortFast be configured globally?
Note You can use the spanning-tree portfast default global configuration command to globally enable the Port Fast feature on all nontrunking ports.
How the configuration of BPDU Guard can secure STP operation?
BPDU guard is a safety mechanism that shuts down ports configured with STP portfast upon receipt of a BPDU. Assuming that all access ports have portfast enabled, this ensures that a loop cannot accidentally be created if an unauthorized switch is added to a topology.
On which switch ports should BPDU guard be enabled?
BPDU Guard feature must be enabled on a port that should never receive a BPDU from its connected device. If a switch port which is configured with Spanning Tree Protocol (STP) PortFast feature, it must be connected to an end device (For exampe: workstation, server, printer etc).
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.
What is spanning-tree BPDU guard?
BPDU guard is a portfast feature that protects your spanning tree on edge ports (Access ports). It (in layman’s terms) monitors your port for BPDUs. If it see’s one (presumably from an unauthorized switch, hub or host), it shuts the port down (err-disabled).
What is spanning-tree Portfast default?
What happens if a Portfast port receives a BPDU?
If an interface is enabled for portfast receives BPDU , the port goes into the spanning-tree inconsistent state. PortFast causes a switch or trunk port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states.
Does Portfast port send BPDU?
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. incrementing. Portfast is definitely enabled.
Is BPDU guard enabled by default?
spanning-tree portfast bpduguard default (By default, BPDU guard is disabled.) Note Globally enabling BPDU guard enables it only on STP ports; the command has no effect on ports that are not running STP.
How do I enable BPDU Guard globally?
The BPDU guard feature can be globally enabled on the switch or can be enabled per interface, but the feature operates with some differences. At the global level, you enable BPDU guard on Port Fast-enabled STP ports by using the spanning-tree portfast bpduguard default global configuration command.
Is Portfast enabled by default?
PortFast and BPDU guard are disabled, by default, on all interfaces.
What is spanning tree Portfast default?
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.
Is PortFast enabled by default?
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!
What is Portfast and BPDU guard?
The PortFast and BPDU. A BPDU is a data message transmitted across a local area network to detect loops in network topologies. Guard features enhance network reliability, manageability, and security for Layer-2 STP. STP is a network protocol that builds a logical loop-free topology for Ethernet networks. .
Does PortFast port send BPDU?
How do I configure Portfast?
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.
