[cisco-voip] cisco IP Phone causes stp loop.

[Jefflin Choi]

LOL. Yeah, same goes for me.

Anyway, it is either the switch doesn't go to errdisable or the Phone
doesn't send BPDU which prevent switches from blocking.

If ever that the IP phone doesn't send BPDU, then the problem can be
encountered not only on CE500 but all the switches of cisco.

Any ideas?


On 7/3/07, Ahmed Elnagar <aelnagar at act-eg.com> wrote:
>
>  Just a note
>
> *I Hate 500 Express *it is a very bad switch and it has a lot of strange
> configuration setting plus no useful troubleshooting capabilities at all.
>
>
>  ------------------------------
>
> *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Jefflin Choi
> *Sent:* Tuesday, July 03, 2007 9:56 AM
> *To:* cisco-voip at puck.nether.net
> *Subject:* [cisco-voip] cisco IP Phone causes stp loop.
>
>
>
> Hi all,
>
>
>
> Some end user plugged the pc port and switch port of an IP Phone to a
> Catalyst CE500 port at the same time causing our client's switch on a loop.
>
>
>
> CE500--------7912 IP Phone
>
>   |                        |
>
>   |------------------------|
>
>
>
> We can't prevent end user making accidental mistakes like this which might
> cause network failure.
>
>
>
> I was wondering if Cisco IP phones are sending BPDU so that the CE500 will
> errdisable the port. Doesn't it?
>
>
>
> Any way to prevent the this from happening?
>
>
>
> Thanks,
>
> Jeff
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://puck.nether.net/pipermail/cisco-voip/attachments/20070703/62e523ca/attachment.html