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Hi Darren,
We have nortel IP phones and Cisco phones on the same network at one of our customers . PC’s connect to phone in both cases, and we use the identical switchport config for cisco and nortel (see below). In the case of the nortel phones the effect of the ” swithcport voice vlan ” command is not for the benefit of cdp but in order that the switchport accept traffic if its tagged , provided its tagged with the voice vlan value.all other untagged traffic falls in the native (data) vlan.When the nortel phones intially start up , they dont participate in the cdp process as your quite correclty pointed out , and so send untagged traffic to the cisco switch ( which the switch places in the data vlan). The nortel phones initially recieve a dhcp offer ip addr on the data vlan, special scope options configured on data vlan scope are specifically understood by the nortel phones and detail what the voice vlan should be ( and match the value used int the “switchport voice vlan ” cmd. The nortel phones then reboot, this time tagging all voice traffic with the vlan value.

hth
carlos.chorao.#11351.r/s
conf t int fa x/x switchport mode access switchort access switchport voice vlan span portfast no sh end

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From: nobody@groupstudy.com on behalf of Hosking, Darren Sent: Mon 05/06/2006 21:51 To: ccielab@groupstudy.com Cc: davidbombal@davidbombal.com; Vincent Mashburn Subject: RE: Voice VLAN and data VLAN configuration

If it’s not a Cisco phone then there is no reason to use “switchport voice vlan” because a non-Cisco phone won’t listen to CDP. CDP and DTP should probably be turned off too.
Nortel documentation talks about LLDP (Link Layer Discovery Protocol) as an industry standard way of doing this, however, there is no mention of this protocol on the Cisco web site.
I’m connecting Nortel phones to a Cisco switch and am concerned about forcing every port to be a trunk. The native VLAN is the data VLAN so a PC directly plugged in will work but I’ve seen some performance issues.
How do others configure Cisco switches for non-Cisco IP phones with daisy chained PC’s or just PC’s (ie one config needs to work for both with no performance penalty)?
Even if the port is not hard coded to be a trunk the switch (tried on 3750) still accepts tagged voice and untagged data, although this means DTP is on which probably shouldn’t be sent to Nortel (and possibly other) IP phones.
Thanks, Darren
—–Original Message—– From: David Bombal [mailto:davidbombal@davidbombal.com] Sent: Monday, 5 June 2006 2:37 AM To: Hosking, Darren Cc: ccielab@groupstudy.com Subject: RE: Voice VLAN and data VLAN configuration
Hi Darren,
The same configuration can be used with other vendors. The Cisco IP Phones use CDP to determine which VLAN they should be in (Voice Vlan ID). Other vendors use a DHCP server with specific options to tell their phones which vlan they belong to. The switch configuration remains the same as far as I am aware.
David Bombal CCIE, CCSI, CCSP, CCIP http://www.ConfigureTerminal.com
—–Original Message—– From: Hosking, Darren [mailto:dhosking@commander.com] Sent: 04 June 2006 11:13 To: David Bombal Subject: RE: Voice VLAN and data VLAN configuration
What about for non-Cisco IP phones?
Thanks, Darren
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of David Bombal Sent: Sunday, 4 June 2006 2:40 AM To: ‘Albert Ip’; ccielab@groupstudy.com Subject: RE: Voice VLAN and data VLAN configuration
Hi Albert,
Previously it was recommended to hardcode the port to trunk for ports that have phones connected to them. These days the recommended way to configure the voice ports is as follows:
EXAMPLE 1: CAT3550(config)#interface FastEthernet0/1 CAT3550(config-if)# switchport access vlan 10 ! DVLAN CAT3550(config-if)# switchport voice vlan 110 ! VVLAN CAT3550(config-if)# mls qos trust device cisco-phone ! Conditional Trust CAT3550(config-if)# service-policy input IPPHONE+PC-BASIC ! Attaches policy
EXAMPLE 2: CAT2970(config)#interface GigabitEthernet0/1 CAT2970(config-if)# switchport access vlan 10 ! DVLAN CAT2970(config-if)# switchport voice vlan 110 ! VVLAN CAT2970(config-if)# service-policy input IPPHONE+PC-BASIC ! Attaches policy
The reason for the change was to stop broadcasts from other VLANS killing phones.
I hope this helps.
Thank you, David Bombal CCIE, CCSI, CCSP, CCIP etc http://www.ConfigureTerminal.com

—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Albert Ip Sent: 03 June 2006 10:29 To: ccielab@groupstudy.com Subject: Voice VLAN and data VLAN configuration
Hi All,
Please help me clarify the following configuration is correct or not, thanks!!!
Voice vlan 200 Data vlan 100 Config on port f0/13
# vlan 100 name VLAN_Data vlan 200 name VLAN_Voice # int f0/13 sw encap dot1q sw mode trunk sw voice vlan 200 sw access vlan 100 #
Please kindly advise, thanks!!!!
Albert
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