[cisco-voip] Switch port configs

[Jason Aarons (US)]

Third party phones can use LLDP-MED.  Avaya phones can get the voice vlan via dhcp on the data vlan and reboot into voice vlan.  You should always avoid having end user ports being trunks, by default trunk mode would pass all vlans into the phone, creates potential spanning tree issues, etc.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Shine Joseph
Sent: Monday, October 11, 2010 5:41 PM
To: Scott Voll; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Switch port configs

If you are connecting a non-Cisco IP phone to a switch, you will need to configure the port as trunk. As Cisco phones/switches uses CDP to work out voice VLAN trunk configuration is not required, though it works well. Due to the management overhead and the security concerns this configuration is not recommended.

When configured with the second option, the switch port gets configured as trunk, internally, but allows only two VLANs - Voice VLAN and the access VLAN.

HTH

Cheers,
Shine


e the port as
From: Scott Voll<mailto:svoll.voip at gmail.com>
Sent: Tuesday, October 12, 2010 1:10 AM
To: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: [cisco-voip] Switch port configs

is there anything wrong with having your switch ports configured as follows?

 switchport trunk encapsulation dot1q
 switchport trunk native vlan 14
 switchport mode trunk
 switchport voice vlan 146

Normally I would have them set like:

switchport access vlan 14
switchport voice vlan 146

These are 3560's running 12.2 code.

TIA

Scott
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