[cisco-voip] IP Phone Ports

[Dave Goodwin]

If you enable bpduguard it will err-disable the port(s) upon receipt of a
BPDU.

On Thu, Nov 10, 2016 at 8:44 AM Stephen Welsh <stephen.welsh at unifiedfx.com>
wrote:

> I thought that this would be prevented by default because of spanning
> tree/BPDU, but it’s common practice to disable spanning tree for access
> ports (i.e. using portfast) so that may allow the loop to occur, so maybe
> just disable port-fast?
>
> Kind Regards
>
> Stephen Welsh
> CTO
>
>
> On 10 Nov 2016, at 13:35, Ahmed Elnagar <ahmed_elnagar at hotmail.com> wrote:
>
> That is not nice at all L
>
> Did you figure out a way to prevent it from switch side?
>
> *From:* Matthew Loraditch [mailto:MLoraditch at heliontechnologies.com
> <MLoraditch at heliontechnologies.com>]
> *Sent:* Thursday, November 10, 2016 3:34 PM
> *To:* Ahmed Elnagar <ahmed_elnagar at hotmail.com>; '
> cisco-voip at puck.nether.net' <cisco-voip at puck.nether.net>
> *Subject:* RE: IP Phone Ports
>
> Yes it will create a loop. Not a fun time trying to track these things
> down. I’ve had some non-Cisco IP phones completely down a LAN.
>
>
> Matthew G. Loraditch – CCNP-Voice, CCNA-R&S, CCDA
> Network Engineer
> Direct Voice: 443.541.1518
> Facebook <https://www.facebook.com/heliontech?ref=hl> | Twitter
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>
> *From:* cisco-voip [mailto:cisco-voip-bounces at puck.nether.net
> <cisco-voip-bounces at puck.nether.net>] *On Behalf Of *Ahmed Elnagar
> *Sent:* Thursday, November 10, 2016 8:28 AM
> *To:* 'cisco-voip at puck.nether.net' <cisco-voip at puck.nether.net>
> *Subject:* [cisco-voip] IP Phone Ports
>
> Dear all;
>
> I want to know what will happen if a user connect “by mistake” both the PC
> port and Switch port to the network switch? Will this create a loop? Anyone
> tried it before?
>
>
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