<div dir="ltr">no, not plugged back into the walljack.<br><br>But the whole phone setup went wild yesterday around 6PM, and he "moved the network equipment on my desk around" around 6PM yesterday. Sure seems a likely culprit!<br>
<br><div class="gmail_quote">On Sat, Sep 20, 2008 at 2:58 PM, Matlock, Kenneth L <span dir="ltr"><<a href="mailto:MatlockK@exempla.org">MatlockK@exempla.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Are you sure that one of the ports off the linksys wasn't 'accidentally' plugged back into a wall jack (and essentially into the upstream switch)?<br>
<br>
Very easy to bridge 2 VLANs doing that, and that will almost definitely affect one (or both) of them.<br>
<br>
What VLAN is used for the data traffic? I believe by default most 'switch' gear uses VLAN 1 by default, and if it was spitting out STP or VTP data, that could cause serious issues, depending on your topology.<br>
<br>
Ken Matlock<br>
<a href="mailto:matlockk@exempla.org">matlockk@exempla.org</a><br>
(303) 467-4671<br>
Network Analyst<br>
Exempla Healthcare<br>
<br>
________________________________<br>
<br>
From: <a href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</a> on behalf of Todd Franklin<br>
Sent: Sat 9/20/2008 1:47 PM<br>
To: Mike Brooks<br>
Cc: <a href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><br>
Subject: Re: [cisco-voip] Switch Hanging off Phone<br>
<div><div></div><div class="Wj3C7c"><br>
<br>
Thanks Mike. The config of the switchport:<br>
<br>
interface FastEthernet0/4<br>
switchport trunk encapsulation dot1q<br>
switchport mode dynamic desirable<br>
switchport voice vlan 6<br>
srr-queue bandwidth share 10 10 60 20<br>
srr-queue bandwidth shape 10 0 0 0<br>
mls qos trust device cisco-phone<br>
mls qos trust cos<br>
auto qos voip cisco-phone<br>
spanning-tree portfast<br>
<br>
It really screwed around with the phones. The data stayed ok.<br>
<br>
He came off from the switchport, into the 7940. From there into the Linksys (which has a built in 4 port switch) and one of those ports he had plugged into his PC.<br>
<br>
What do you think?<br>
<br>
Todd<br>
<br>
<br>
On Sat, Sep 20, 2008 at 3:38 PM, Mike Brooks <<a href="mailto:2xccie2b@gmail.com">2xccie2b@gmail.com</a>> wrote:<br>
<br>
<br>
What was the configuration of the switchport ? Also was the data vlan<br>
affected at all or just devices on the voice vlan ? A common issue we<br>
have seen with hubs plugged in is them getting mis-cabled by the<br>
enduser and getting looped up causing major issues on the network. I<br>
do not believe the linksys devices send BPDUs. If it was a cabling<br>
issue on the linksys ..then enabling bpduguard on the port will<br>
errdisable the port..because the port will receive its own bpdu if the<br>
linksys is miscabled.<br>
<br>
Also, the linksys could have been acting as a rouge dhcp server. Not<br>
knowing how your network is set up or the symptoms you were<br>
experiencing it would be hard to tell.<br>
<br>
Just a few guesses ;-)<br>
<br>
hth,<br>
<br>
Mike Brooks<br>
CCIE# 16027 (R&S)<br>
<br>
<br>
On Sat, Sep 20, 2008 at 3:10 PM, Todd Franklin <<a href="mailto:toddnh65@gmail.com">toddnh65@gmail.com</a>> wrote:<br>
> Phone system went "kerflunk" yesterday. Found a 7940 with a Linksysy<br>
> wireless router plugged into the PC port of the phone. Could that have done<br>
> it? I seem to remember one VAR telling me this was a grand way to take an<br>
> IPT network down.<br>
><br>
> Also, is there any configuration I can add to the 3560s that would<br>
> "disallow" this configuration?<br>
><br>
> Thank you!<br>
><br>
> Todd<br>
<br>
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><br>
><br>
<br>
<br>
<br>
</div></div></blockquote></div><br></div>