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 <[EMAIL PROTECTED]> 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 > _______________________________________________ -- 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
