What is STP Bpdu guard?
BPDU Guard is a feature that defends the Layer 2 Spanning Tree Protocol (STP) topology against BPDU-related threats and is designed to protect the switching network. The BPDU guard feature must be activated on ports that should not receive BPDUs from connected devices.
What does STP guard do?
STP loop guard prevents any alternative or root ports from becoming designated ports (ports toward downstream switches) due to loss of BPDUs on the root port.
What is spanning tree port type normal?
spanning-tree port type (default global) Configures all switch interfaces as edge/network/normal ports. These ports can be connected to any type of device. The no form of the command disables the spanning tree operation.
What is UplinkFast and BackboneFast?
UplinkFast works by finding alternate ports for directly connected links. Similarly BackboneFast works on finding an alternate path when an indirect link to the root port goes down.
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.
When should I enable root guard?
Root Guard feature can be enabled on switch ports that is connected to other switches that should never become a Root Bridge. For example, a port on the distribution layer switch which is connected to an access layer switch can be Root Guard enabled, because the access layer switch should never become the Root Bridge.
How do I disable BPDU guard?
To disable BPDU guard, use the no spanning-tree portfast bpduguard default global configuration command. You can override the setting of the no spanning-tree portfast bpduguard default global configuration command by using the spanning-tree bpduguard enable interface configuration command on an STP port.
What is spanning tree type network?
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.
What is TCN guard?
no spanning-tree tcn-guard. Description. Disables propagation of topology change notifications (TCNs) to other STP ports. Use this when you do not want topology changes to be noticed by peer devices. The no form of this command, enables propagation of topology changes.
How do I enable loop guard on a spanning tree port?
You can enable Loop Guard per interface on either shared or point-to-point links. The spanning tree port type designation depends on the device the port is connected to, as follows: Edge—Edge ports are connected to Layer 2 hosts and are access ports.
How do I enable loop guard in Cisco NX-OS?
If you are familiar with the Cisco IOS CLI, be aware that the Cisco NX-OS commands for this feature might differ from the Cisco IOS commands that you would use. You can enable Loop Guard per interface on either shared or point-to-point links. The spanning tree port type designation depends on the device the port is connected to, as follows:
What is the default spanning tree interface?
The default spanning tree interface is normal ports. You can use Bridge Assurance to protect against certain problems that can cause bridging loops in the network.
How to enable or disable BPDU guard for a spanning tree interface?
Enables or disables BPDU Guard for the specified spanning tree edge interface. By default, BPDU Guard is disabled on the interfaces. Falls back to the default BPDU Guard global setting that you set for the interfaces by entering the spanning-tree port type edge bpduguard default command.