From: Scott Morris (swm@emanon.com)
Date: Wed May 31 2006 - 22:30:23 ART
If you're configuring an IP phone (cisco in particular), you are required to
trunk, so your first config will not work.
When you do trunk to the phone, your PC traffic is supposed to be untagged
but your voice vlan traffic should be tagged (trunked). So your second
config won't work either...
The voice vlan command is used to modify a field in CDP frames so that the
Cisco IP phone can read what the voice vlan (or auxilliary vlan if you've
been around a while!) is to help it "discover" itself. But otherwise,
doesn't really dictate anything.
Note the configs:
http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration
_guide_chapter09186a00801cdf35.html
The trunking portion really isn't covered in there at all because both
Cisco's IP phones and the 3550 work with dynamic trunking protocols to
magically figure things out! If you are running on a different switch (or
NM-16ESw), you'll need:
Switchport encapsulation dot1q
Switchport native vlan 10 <-- The UNTAGGED one!
Switchport mode trunk
Cheers,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Vinu
Sent: Wednesday, May 31, 2006 9:22 PM
To: Cisco certification
Subject: if voice phone supports 802.1q should i config the port as trunk
hey i have a voice phone connected to my switch consider f 0/15, the voice
vlan is 100 and data vlan is 10, my phone supports 802.1q...
tell me which one is correct ?
#switchport voice vlan 200
#switchport access vlan 10
#switchport mode access
other sugestion is
#switchport voice vlan 200
#switchport trunk encapsulation dot1q
#switchport trunk allowed vlan 10
--
Regards,
Vinu
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