What is spanning tree BPDU filter enable?
The spanning-tree BPDUfilter works similar to BPDUGuard as it allows you to block malicious BPDUs. When you receive a BPDU on a portfast enabled interface then it will lose its portfast status, disables BPDU filtering and acts as a normal interface.
What is the use of spanning tree BPDUGuard enable?
You also can use the spanning-tree bpduguard enable interface configuration command to enable BPDU guard on any STP port without also enabling the Port Fast feature. When the interface receives a BPDU, it is put in the error-disabled state.
What is difference between BPDU guard and BPDU filter?
BPDU filter will prevent inbound and outbound BPDU but will remove portfast state on a port if a BPDU is received. On the other hand, BPDU Guard keeps an eye open for any BPDU’s entering the interfaces that are enabled this feature. The port will disable as soon as the first BPDU is received, by shutting the port down.
When should BPDUfilter be used?
you would use bpdufilter when you want a switch plugged into your network but you don’t want it participating in spanning tree. An example: In an office environment where someone needs another network drop under their desk but you don’t have time/budget to run a new line for now.
What is the use of BPDU filter?
BPDU filter is a feature used to filter sending or receiving BPDUs on a switchport. It is extremely useful on those ports which are configured as portfast ports as there is no need to send or receive any BPDU messages on of these ports. BPDU filter can be configured globally or under the interface level.
What does BPDU filter do?
Can I use BPDU filter on trunk ports?
You should never use portfast or BPDU guard/filter on inter-switch trunk ports. Only access ports.
Why do we use BPDU filters?
What is BPDU filter enable?
The STP BPDU filter feature allows control of spanning tree participation on a per-port basis. It can be used to exclude specific ports from becoming part of spanning tree operations. A port with the BPDU filter enabled will ignore incoming BPDU packets and stay locked in the spanning tree forwarding state.
Why is a BPDU filter needed?
Why is a BPDU filter needed at the demarc point? To prevent the ISP’s WAN topology from mixing with the corporate network’s topology for the purpose of plotting STP paths.
What is the benefit of BPDU guard?
BPDU Guard feature protects the port from receiving STP BPDUs, however the port can transmit STP BPDUs. When a STP BPDU is received on a BPDU Guard enabled port, the port is shutdown and the state of the port changes to ErrDis (Error-Disable) state.