asterisk users - Mar 2008 - Polycom IP 330 w/VLAN?

Hi, all.  I see that the Polycom SoundPoint IP 330 supports VLAN... but I
don't quite see how that works.  Do you point a non-VLAN'd segment at it
(akin to when you uplink a VLAN_enabled switch), and have the phone
implement the VLAN?  Or...?  *puzzled*

Thanks much,

-Ken

On Tue, Mar 11, 2008 at 04:48:19PM -0400, Ken D'Ambrosio
wrote:
> Hi, all.  I see that the Polycom SoundPoint IP 330 supports VLAN... but I
> don't quite see how that works.  Do you point a non-VLAN'd segment
at it
> (akin to when you uplink a VLAN_enabled switch), and have the phone
> implement the VLAN?  Or...?  *puzzled*
I would personally assume (without looking) that this means that the
phone speaks 802.1q on its uplink, and can assign the phone itself and
any pass-thru jacks to separate VLANs on the attached network.

Is that phone Linux-based?  Cause Linux has known how to do 1q for some
time; 2.4 at least, and maybe 2.2...

Cheers,
-- jra
-- 
Jay R. Ashworth                   Baylink                      jra at
baylink.com
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates     http://baylink.pitas.com                    
'87 e24
St Petersburg FL USA      http://photo.imageinc.us             +1 727 647 1274

	     Those who cast the vote decide nothing.
	     Those who count the vote decide everything.
	       -- (Joseph Stalin)

The 330/550/650 phones have a built-in 2-port switch that speaks
802.1q. Usual use of this is to send two VLANs down the wire. The
phone is configured to use one, and the phone transparently passes the
other to the phone's PC port. On Cisco, this would be a trunk port
with two VLANs, one for the phone and one for the PC (the latter
usually being the default VLAN). On HP ProCurve, you assign one tagged
and one untagged VLAN to the phone.

The VLAN used by the phone can be configured in several ways:

1. Hard-code it on the phone. Not recommended if you have lots of phones.
2. Auto-discovery using CDP. Requires Cisco or older HP switches.
3. Auto-discovery using DHCP. Disabled by default in SIP 2.1.x.

We use the third option. The phone first does DHCP on the default VLAN
(since it does not yet know which VLAN to use). The DHCP server sends
back the VLAN to use, which cause the phone to send a DHCP release,
reconfigure itself for the new VLAN, and do DHCP again on the new
VLAN. We use this method because we have newer HP switches that have
removed CDP support in favor of LLDP, which Polycom does not (yet?)
support.

-James


On 3/11/08, Ken D'Ambrosio <ken at jots.org>
wrote:
> Hi, all.  I see that the Polycom SoundPoint IP 330 supports VLAN... but I
> don't quite see how that works.  Do you point a non-VLAN'd segment
at it
> (akin to when you uplink a VLAN_enabled switch), and have the phone
> implement the VLAN?  Or...?  *puzzled*
>
> Thanks much,
>
> -Ken
>
>
> _______________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>