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 <[email protected]> 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 <[email protected]> wrote: > > That is not nice at all L > > Did you figure out a way to prevent it from switch side? > > *From:* Matthew Loraditch [mailto:[email protected] > <[email protected]>] > *Sent:* Thursday, November 10, 2016 3:34 PM > *To:* Ahmed Elnagar <[email protected]>; ' > [email protected]' <[email protected]> > *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 > <https://twitter.com/HelionTech> | LinkedIn > <https://www.linkedin.com/company/helion-technologies?trk=top_nav_home> | > G+ <https://plus.google.com/+Heliontechnologies/posts> > > *From:* cisco-voip [mailto:[email protected] > <[email protected]>] *On Behalf Of *Ahmed Elnagar > *Sent:* Thursday, November 10, 2016 8:28 AM > *To:* '[email protected]' <[email protected]> > *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? > > > _______________________________________________ > cisco-voip mailing list > [email protected] > https://puck.nether.net/mailman/listinfo/cisco-voip > > > _______________________________________________ > cisco-voip mailing list > [email protected] > https://puck.nether.net/mailman/listinfo/cisco-voip >
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