Cisco 200-125 Exam
Which command enhances the 802.1D convergence time on ports that are connected to hosts?
- A. spanning-tree backbonefast
- B. spanning-tree uplinkfast
- C. spanning-tree portfast
- D. spanning-tree cost512
Answer: Option C.
By using PortFast feature, the port wont spend 50 seconds to move from blocking (20sec), listening (15sec), learning (15sec) and finally forwarding but will jump directly to the forwarding state. This feature should be used on ports connected to hosts only because hosts surely dont send BPDU. An example of configuring
PortFast on an interface is shown below: