RE: if voice phone supports 802.1q should i config the port as

From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Wed May 31 2006 - 22:42:35 ART

Hi Scott
What about this one
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225see/scg/swvoi
p.htm#wp1030836

Configuring Ports to Carry Voice Traffic in IEEE 802.1Q Frames

Beginning in privileged EXEC mode, follow these steps to configure a port to
carry voice traffic in IEEE 802.1Q frames for a specific VLAN:
         

Step 1

configure terminal

Enter global configuration mode.

Step 2
        

mls qos
        

Enable QoS for the entire switch.

Step 3
        

interface interface-id
        

Specify the interface connected to the IP phone, and enter interface
configuration mode.

Step 4
        

mls qos trust cos
        

Classify ingress traffic packets with packet CoS values. For untagged
packets, use the port default CoS value.

Step 5
        

switchport voice vlan vlan-id
        

Instruct the Cisco IP Phone to forward all voice traffic through the
specified VLAN. By default, the Cisco IP Phone forwards the voice traffic
with an IEEE 802.1Q priority of 5.

Valid VLAN IDs are from 1 to 4094.

Step 6
        

end
        

Return to privileged EXEC mode.

Step 7
        

show interfaces interface-id switchport or

show running-config interface interface-id
        

-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de Scott
Morris
Enviado el: Miircoles, 31 de Mayo de 2006 09:30 p.m.
Para: 'Vinu'; 'Cisco certification'
Asunto: RE: if voice phone supports 802.1q should i config the port as trunk

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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