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. Access ports belong to different VLANs.
Spanning Tree Protocol Security Gpon Solution
In a valid configuration Port Fast-enabled ports do not receive BPDUs.
Spanning tree portfast bpduguard default. What is the cause of the issue. To do these changes run the below commands in CLI mode of switch. Issue this command in order to enable STP PortFast BPDU guard on the switch.
By default STP BPDU guard is disabled. A network administrator uses the spanning-tree portfast bpduguard default global configuration command to enable BPDU guard on a switch. Spanning Tree Root Guard prevents an unintended switch from becoming the root bridge.
Switch configure terminal switchconfig spanning-tree port type edge bpduguard default Enabling BPDU Guard on Specified Interfaces. This will enable the bpduguard on the trunk port above due to the switchport is in portfast the command. So In this scenario we require to made PortFast to only port Fa01.
Another Spanning Tree command to cover is Root Guard and this is used for a different reason than Portfast and BPDU Guard are. Default Enable portfast by default on all access ports so that means it enable portfast but it will not write the spanning-tree portfast command for each interface into the running or startup config. In case you are using the spanning tree portfast default all the ports will change to portfast mode automatically.
There is no way to enable portfast on trunks globally precisely because of the safety concerns against loops. 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. If you reaaly want portfast on a trunk which you might do if the trunk is connected to a server then you have to put spanning-tree portfast trunk on the interface itself.
Enabling BPDU Guard shuts down the port if it receives a BPDU. Config-if spanning-tree bpduguard enable BPDUガードの設定スイッチ上でのグローバルでの有効化 config spanning-tree portfast bpduguard default. If the BPDU Guard is configured on the global level using the spanning-tree portfast bpduguard default command the BPDU Guard will be automatically enabled on all PortFast-enabled ports of the switch.
Spanning-tree portfast trunk end. In your config u have just 1 entry spanning-tree portfast default so all access ports are portfast. Default Set a command to its defaults So what you did was Id think reset spanning-tree portfast default to its default settings IE.
PortFast is not configured on all access ports. Spanning-tree portfast bpduguard default. You can enable or disable STP PortFast BPDU guard on a global basis which affects all ports that have PortFast configured.
When you configure spanning-tree portfast default the portfast feature is enabled on all ports. In above command we can see there are three options available bpdu filter bpdu guard and default. This example shows how to enable BPDU Guard on all spanning tree edge ports.
Spanning-tree portfast bpduguard default. Spanning tree shuts down ports that are in a Port Fast-operational state if any BPDU is received on them. At the global level you enable BPDU guard on Port Fast-enabled ports by using the spanning-tree portfast bpduguard default global configuration command.
This command disables the portfast enabled ports when BPDUs are received on these ports. That is why enabling portfast globallly usually goes hand-in-hand with spanning-tree portfast bpduguard default which restores some level of protection against loops. The global command spanning-tree portfast bpduguard default is useful when you already have portfast enabled on ports either globally via spanning-tree portfast default or on ports directly via spanning-tree portfast.
You can enable BPDU Guard on specified interfaces. By default spanning tree sends BPDUs from all ports regardless of whether PortFast is enabled. Enable the Port Fast feature.
BPDU guard needs to be Continue reading. Spanning tree shuts down STP ports that are in a Port Fast-operational state if any BPDU is received on those ports. Enter interface configuration mode and specify the interface connected to an end station.
The catch is I had the bpduguard enabled on the global level in my switch spanning-tree portfast bpduguard default. You do not need to configure the BPDUguard on the trunk ports since portfast should be disabled on these ports anyway. Globally enable BPDU guard on the switch.
Return to privileged EXEC mode. By default BPDU guard is disabled. Console enable Cisco IOS Software Command.
CatOS Command Console enable set spantree portfast bpdu-guard enable Spantree portfast bpdu-guard enabled on this switch. On trunk ports you need to manually disable this feature with the no spanning-tree portfast command. BPDU Guard can be configured globally or on a per-interface basis.
I would assume its because of the default you have prepending the command making this a default command not a spanning-tree command. Spanning-tree portfast bpdufilter default I surmise that if a BPDU is detected BPDUFilter global will take the port out of the portfast state and shortly thereafter BPDUGuard will shut the port down. However BPDU guard is not activated on all access ports.
Spanning Tree Root Guard.