Re: question on port fast and bpdu guard

For the 3560 switch, our star of the CCIE R&S Exam, if you enable BPDU Guard in global configuration mode, it only effects PortFast ports on the device.

If you enable BPDU Guard at the interface level, it can be enabled for any port regardless of PortFast settings.

PortFast is not REQUIRED in traditional STP topologies, just recommended for ports connecting to devices that power cycle like host systems. The PortFast command does indeed carry forward to RSTP/MSTP networks and is critical for the identification of EDGE PORTS in the RSTP topology.

Check out this Expert-level link:

http://blog.ine.com/2010/04/05/understanding-stp-and-rstp-convergence/

Warmest Regards,

Anthony J. Sequeira, CCIE #15626
http://www.INE.com

On Apr 15, 2010, at 10:49 AM, imran ali wrote:

> HI gurus,
>
> does enabling bpdu guard requires a port fast to be enabled.. i mean bpdu
> guard can be enabled independent of port fast status ?.
>
> further why portfast is required in traditional STP topology and not in RSTP
> networks..??
>
> can i enable portfast feature in RSTP netorks
>
> Thanks,
>
>
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Received on Thu Apr 15 2010 - 11:13:13 ART