[cisco-voip] voice-VLAN problems between Cat 3500XL and Cisco IP phones?

[Wes Sisk]

can you paste in your current switch port config?  Here is a working  
config for one of my desk phones:

interface FastEthernet0/15
switchport trunk encapsulation dot1q
switchport trunk native vlan 120
switchport mode trunk
switchport voice vlan 425
spanning-tree portfast

also, make sure you created the vlan under the vlan database.  I  
believe the 35xx do not auto create the vlan when you configure it on  
a port
vlan database
show

/Wes

On Oct 22, 2006, at 8:39 AM, Alexander Bochmann wrote:

Hi,

we're currently trying to connect a couple of Cisco IP phones
to older Cat 3524XL PoE switches.

The access ports on the switches are configured as trunk,
with the voice-VLAN as non-native (according to Cisco-docs,
just configuring the voice vlan doesn't work on the old 12.0WC
IOS on those switches).
Voice-VLAN autodetection via CDP works. If we connect other
devices in the voice VLAN, everything is fine.
If we connect a Cisco IP phone, DHCP doesn't work. The phones
just say "DHCP timeout", although a sniffer shows that they
receive DHCP answers from the server.

Has anyone perhaps run into a similar problem? I'm thoroghly
out of ideas what to try next...

Alex.

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