Re: Portfast in Trunk port

I am pretty sure this could be beneficial in a router on a stick scenario. So that of course begs the question - who the ^%&$ would do that in production.

This could also be used in a situation where you have a VMware ESX host that is trunking multiple VLANs to the Catalyst Switch.

Cisco does indeed caution against using this feature between two switches in your infrastructure.

Anthony Sequeira
http://www.stormwind.com
Twitter: @compsolv
Facebook: http://www.facebook.com/compsolv

On May 4, 2012, at 1:37 PM, CCIE KID wrote:

> Hi all
>
> I have a doubt in enabling Portfast in trunk port. My customer config has
> enabled Portfast in trunk port and i have no idea why we should enable it
> on trunk port and hat use it has. Yes Portfast is used for Host connected
> ports and it virtually doesn't go thru the STP port states such listening
> and learning and thereby goes to forwarding directly and also if there is
> any change in port status such as removing the PC or server or any other
> device, TCN BPDUs will not be generated. THis is the function of Portfast.
> So why would u enable Portfast on Trunk ports.
>
> So if the trunk port goes down, TCN BPDU won't be generated for that
> particular trunk port , and so the STP convergence will be affected with
> this ?
> Any thoughts on this ?
>
> Need experts advice on this ? Why do they do purposefully in real time ..
> Any reasons behind it
>
>
>
> --
> With Warmest Regards,
>
> CCIE KID
> CCIE#29992 (Security)
>
>
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Received on Fri May 04 2012 - 14:00:36 ART