Spanning Tree Portfast

[majdaldeensaqer]

Hi !

as far as i know that portfast should be configured only on an access link !

i don't get exactly the point of it ...

for example lets say i want to send a frame from PC1 (that is connected to SW1) to PC2 (that is connected to SW2) ... even if portfast was configured on the access ports connected to both PCs , dont i have to wait for the switches to exchange BPDU and go through Listening and Learning states before my frame would be delivered to PC2 ?

sorry if my question wasn't clear ... my english is not that good !

Thank you 

[luis_cordova · Accepted solution]

Hi @majdaldeensaqer ,

You are right.

The detail is that the links between network devices, such as between switches, are permanent, so the spanning-tree process would only be done once.

On the contrary, the links between network devices and end devices is not permanent, so waiting for the spanning-tree process every time a new device is connected is what you avoid when entering the portfast command.

Regards

[Joseph W. Doherty · Accepted solution]

In addition to what Luis described, having portfast on (generally) the (user) edge ports also avoids sending topology change notifications as the edge port goes up or down.

[majdaldeensaqer]

Thank You very much ... all clear now !

[majdaldeensaqer]

thank you ! ^^