How do I disable BPDU guard?
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 the purpose of setting BPDU guard on switch access ports?
BPDU Guard feature is used to protect the Layer 2 Spanning Tree Protocol (STP) Topology from BPDU related attacks. BPDU Guard feature must be enabled on a port that should never receive a BPDU from its connected device.
When should I use spanning-tree Bpduguard?
BPDU filtering allows you to avoid transmitting BPDUs on PortFast-enabled ports that are connected to an end system. When you enable PortFast on the switch, spanning tree places ports in the forwarding state immediately, instead of going through the listening, learning, and forwarding states.
How do I know if my BPDU Guard is enabled?
To display the BPDU guard state, enter the show running configuration or the show stp-bpdu-guard command. For the BPDU status enter the stp-bpdu-guard command.
Can I use BPDU filter on trunk ports?
A BPDU is a data message transmitted across a local area network to detect loops in network topologies. Guard feature can be enabled on any of the STP. Guard feature on a trunk port that forms the STP. STP is a network protocol that builds a logical loop-free topology for Ethernet networks.
On what switch ports should BPDU guard be enabled?
Question: On what switch ports should BPDU guard be enabled to enhance STP stability? Explanation: End-user ports should connect only to end-user devices and not to other switches.
How do I disable PortFast ports?
To disable PortFast and BPDU Guard uncheck the PortFast and BPDU Guard checkboxes. It is recommended to enable PortFast only on access port types. However, PortFast can be enabled on the trunk ports by selecting the Trunk checkbox in the WebUI.
What does BPDU guard stand for?
Bridge Protocol Data Unit
Introduction. This document explains the PortFast Bridge Protocol Data Unit (BPDU) guard feature. This feature is one of the Spanning Tree Protocol (STP) enhancements that Cisco created. This feature enhances switch network reliability, manageability, and security.
Do you need to enable bpduguard on Fex?
Hence you can connect it to switch if you want to keep it just Layer 3. But if you want to keep the port as layer 2, then as Jeye mentioned, bpduguard is enabled by default. Now when you connect a switch to FEX, it will send out a BPDU and hence the FEX port will get err-disabled.
How to disable BPDU guard on a port?
Check whether you have the BPDU Guard enabled globally using the spanning-tree portfast bpduguard default global configuration command. If that is the case then on the individual port, the BPDU Guard can be disabled using the spanning-tree bpduguard disable command.
Which is the host interface layer bpduguard or Fex?
From 5.2.1, by default the host interfaces are Layer 3. Hence you can connect it to switch if you want to keep it just Layer 3. But if you want to keep the port as layer 2, then as Jeye mentioned, bpduguard is enabled by default. Now when you connect a switch to FEX, it will send out a BPDU and hence the FEX port will get err-disabled.
Do you need to enable BPDU filter on Switch Interface?
If you want to connect a switch to those port then you need to enable bpdu filter on the switch interface which connects to FEX. This will prevent any BPDU going from switch to FEX and hence it will work out for you.