[cisco-voip] Switch Hanging off Phone

[Mike Brooks]

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
>
>