350-401 · Question #436
Refer to the exhibit. Rapid PVST+ is enabled on all switches. Which command set must be configured on Switch1 to achieve the following results on port fa0/1? - When a device is connected, the port tra
The correct answer is B. Switch1(config)# spanning-tree portfast bpdufilter default. To enable immediate port forwarding and suppress BPDU transmission/reception while maintaining operational status upon BPDU receipt, the spanning-tree portfast bpdufilter default command is used.
Question
Refer to the exhibit. Rapid PVST+ is enabled on all switches. Which command set must be configured on Switch1 to achieve the following results on port fa0/1?
- When a device is connected, the port transitions immediately to a forwarding state.
- The interface should not send or receive BPDUs.
- If a BPDU is received, it continues operating normally.
Exhibits
Options
- ASwitch1(config)# interface f0/1
- BSwitch1(config)# spanning-tree portfast bpdufilter default
- CSwitch1(config)# spanning-tree portfast bpduguard default
- DSwitch1(config)# interface f0/1
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Why each option
To enable immediate port forwarding and suppress BPDU transmission/reception while maintaining operational status upon BPDU receipt, the `spanning-tree portfast bpdufilter default` command is used.
This command only enters interface configuration mode and does not configure PortFast, BPDU filtering, or specify behavior upon BPDU reception.
The `spanning-tree portfast bpdufilter default` command configures PortFast globally and enables BPDU filtering on all PortFast-enabled interfaces. This suppresses BPDUs, allows immediate port transition to forwarding, and, if a BPDU is received, the port reverts to normal STP operation without disabling.
The `spanning-tree portfast bpduguard default` command enables BPDU Guard globally, which disables a PortFast-enabled port upon receiving a BPDU, directly contradicting the requirement to continue operating normally.
This command only enters interface configuration mode and does not configure PortFast, BPDU filtering, or specify behavior upon BPDU reception.
Concept tested: Spanning Tree PortFast BPDU Filter
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750x_cg/sw_mstp.html#wp1078491
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