[asterisk-users] Polycom IP600 + PC share same switch port with VLAN

[James Sneeringer]

As far as I can tell, with Polycom phones you cannot do what you're
asking (which is for the PC and the phone to be in the same VLAN while
the PC is connected to the phone). I don't know how they handle it
when the voice frames are untagged, but they definitely won't pass
tagged voice frames to the PC port:

http://knowledgebase.polycom.com/KanisaPlatform/Publishing/616/12526_f.SAL_PUBLIC_1_2.html

Your switch port is configured for untagged frames on a single VLAN
(that's what "access" mode is). Polycom phones need voice and data to
be on separate VLANs in order for you to use the PC port. Since
Polycom phones apparently don't support the Cisco Voice VLAN feature,
you need to configure the port as a trunk port, which will allow you
to send multiple VLANs to the phone. The phone will take frames tagged
for your designated voice VLAN, and will pass the rest on to the PC
port. For example:

interface FastEthernet2/0/1
 switchport trunk encapsulation dot1q
 switchport trunk native vlan XXX
 switchport trunk allowed vlan XXX,100
 switchport mode trunk
 spanning-tree portfast trunk

Replace XXX with whatever your PC VLAN is. Setting XXX as the native
VLAN for this port will cause frames in that VLAN to be untagged for
that port, which is what your PC probably expects. If it happens to be
1, then it's the native VLAN by default. The last command may or may
not be available, depending on your version of IOS. If it isn't,
portfast just won't work and you're just stuck with STP negotiation
anytime the port bounces.

-James


On Fri, Feb 29, 2008 at 12:13 AM, Lee, John (Sydney)
<John.Lee at compuware.com> wrote:
> Thanks very much for the quick response.
>
>  However, "switchport voice vlan.." I thought is only valid for CISCO phones
>  and I am using Polycom and thus it would not work.
>
>  Furthermore, I have already tried "switchport voice vlan..." before I emailed to the list.
>  ________________________________________
>  From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Bob G
>  Sent: Friday, 29 February 2008 5:02 PM
>  To: Asterisk Users Mailing List - Non-Commercial Discussion
>  Subject: Re: [asterisk-users] Polycom IP600 + PC share same switch port with VLAN
>
>
>  You can paste and copy
>
>  innterface FastEthernet2/0/1  switchport access vlan 20 switchport mode access switchport voice vlan 120 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
>
>
> ----- Original Message -----
>  From: "Lee, John (Sydney)"
>  To: asterisk-users at lists.digium.com
>  Subject: [asterisk-users] Polycom IP600 + PC share same switch port with VLAN
>  Date: Fri, 29 Feb 2008 16:39:24 +1100
>
>
>  Hi all,
>
>  I have been googling and testing without any luck and would appreciate
>  any guidance from anyone.
>
>  A port has already been configured on the CISCO switch with the
>  following:
>  interface FastEthernet2/0/1
>  description VOIP VLAN 100
>  switchport access vlan 100
>  switchport mode access
>  duplex full
>  speed 100
>
>  I plugged the phone into the port and everything worked as far as VOIP
>  is concerned.
>
>  Then I plug a PC into the PC port of the Polycom phone with the hope
>  that I only need one port to support 2 devices.
>  (I wanted the VOIP phone to use VLAN 100 and PC just the native VLAN)
>
>  PROBLEM: However, I found that I could not get the PC (using DHCP) to
>  get an IP address at all. It seems to be that the traffic from the PC is
>  also tagged as VLAN 100 as well.
>  I was told by others that there is a setting on the Polycom phone which
>  allows the traffic of the PC, under this type of settings, to go native.
>
>  Can anyone please help?
>
>  Thanks.
>
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