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

[Ahmed Elnagar]

Well, I was not trying to answer the Q. I was just sharing my dislikeness of this switch as I had alot o problems with it :), sepically with vlans trunking. I had it running with IP Phones normally with no problem. changeing the port role on the switch sometimes it helps, but I dont think in ur case. but what I got from ur words seems that the users is not using a PC connected to th phone (otherwise they will connect 2 cables from the switch) if that is the case try to disable the PC port of the IP Phone.
 
Thanks and Best Regards

Ahmed A. Elnagar
Network Engineer Specialist
 
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt 
Postal Code:12411 Cairo Egypt

Mob: +2010-2833868
Website: www.act-eg.com
E-mail: aelnagar at act-eg.com

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From: cisco-voip-bounces at puck.nether.net on behalf of Matt Slaga (US)
Sent: Tue 03-Jul-07 3:25 PM
To: Ahmed Elnagar; Jefflin Choi; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] cisco IP Phone causes stp loop.



Wow, that reply should help you solve that problem lickety split!

 

Try turning off GARP on the phone, disable web access and turn off voice vlan access.

 

 

 

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Tuesday, July 03, 2007 3:25 AM
To: Jefflin Choi; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] cisco IP Phone causes stp loop.

 

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.

 

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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

 

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