Thought I would share something I had trouble with and was able to get resolved. Below is a code snip from one of my customers switches. This was on a dell powerconnect 5548P. Using this code to set the phones automatically in the voice vlan use LLDP MED. This is similar to how you can set a Cisco UC phone in the voice vlan using Cisco CDP. In this situation we are using Polycom 550 and 650 phones. These phones support LLDP MED and have LLDP enabled by default. The below code auto sets the phone into the voice vlan 100 while leaving the PC connected to the phone in the default native vlan 1. You may or may not need to adjust the OUI table to match the MAC addressess of your devices. One caveat I found is you must set a hostname on the switch. If you leave the hostname as is out of the box the switch will pass a null value to the phone in the LLDP MED communication and it will fail to work.
Code:
Vlan Database
Vlan 100
interface vlan 1
ip address 192.168.1.254 255.255.255.0
interface vlan 100
Name Voice
IP address 10.10.1.254 255.255.255.0
Voice vlan enable
voice vlan ID 100
spanning-tree bpdu filtering
qos trust cos (its my understanding that Polycom's tag their traffic with a COS of 5 rather than a DSCP of 46. Can be changed in the provisioning file)
lldp med network-policy 1 voice vlan 100 vlan-type tagged
interface gigabitethernet1/0/36
spanning-tree disabled
lldp notifications enable
lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy
lldp med enable network-policy location poe-pse inventory
lldp med network-policy add 1
switchport mode general
switchport general allowed vlan add 1,100 untagged
