Enable portfast in production network

Hi Experts,

Curious to know if portfast can be enabled in production network without casuing service disruption?

I tested with IOU in GNS3 and it seem to have no packet loss when the port was enabled with portfast. "debug spanning-tree events" also did not show any event nor the topology change was observed for that VLAN.

 

Is it safe to enable access ports with portfast while the traffic is being sent over the port?

 

Your help is highly appreciated!

 

-Aniruddh

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