[cisco-voip] Switch Hanging off Phone

[Todd Franklin]

Thanks Mike.  The config of the switchport:

interface FastEthernet0/4
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 switchport voice vlan 6
 srr-queue bandwidth share 10 10 60 20
 srr-queue bandwidth shape  10  0  0  0
 mls qos trust device cisco-phone
 mls qos trust cos
 auto qos voip cisco-phone
 spanning-tree portfast

It really screwed around with the phones.  The data stayed ok.

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.

What do you think?

Todd

On Sat, Sep 20, 2008 at 3:38 PM, Mike Brooks <2xccie2b at gmail.com> wrote:

> What was the configuration of the switchport ?  Also was the data vlan
> affected at all or just devices on the voice vlan ?  A common issue we
> have seen with hubs plugged in is them getting mis-cabled by the
> enduser and getting looped up causing major issues on the network.  I
> do not believe the linksys devices send BPDUs.  If it was a cabling
> issue on the linksys ..then enabling bpduguard on the port will
> errdisable the port..because the port will receive its own bpdu if the
> linksys is miscabled.
>
> Also, the linksys could have been acting as a rouge dhcp server.  Not
> knowing how your network is set up or the symptoms you were
> experiencing it would be hard to tell.
>
> Just a few guesses ;-)
>
> hth,
>
> Mike Brooks
> CCIE# 16027 (R&S)
>
> On Sat, Sep 20, 2008 at 3:10 PM, Todd Franklin <toddnh65 at gmail.com> wrote:
> > Phone system went "kerflunk" yesterday.  Found a 7940 with a Linksysy
> > wireless router plugged into the PC port of the phone.  Could that have
> done
> > it?  I seem to remember one VAR telling me this was a grand way to take
> an
> > IPT network down.
> >
> > Also, is there any configuration I can add to the 3560s that would
> > "disallow" this configuration?
> >
> > Thank you!
> >
> > Todd
> > _______________________________________________
> > cisco-voip mailing list
> > cisco-voip at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-voip
> >
> >
>
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