<div dir="ltr">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><div class="gmail_quote">On Sat, Sep 20, 2008 at 3:38 PM, Mike Brooks <span dir="ltr"><<a href="mailto:2xccie2b@gmail.com">2xccie2b@gmail.com</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;">
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>
<div><div></div><div class="Wj3C7c"><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>
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</blockquote></div><br></div>