From: Edison Ortiz (edisonmortiz@gmail.com)
Date: Wed Jan 24 2007 - 13:29:26 ART
Did you enter the global command 'mls qos' ?
From the 3560 Doc
Usage Guidelines
You should configure voice VLAN on Layer 2 access ports.
You must enable Cisco Discovery Protocol (CDP) on the switchport connected
to the Cisco IP phone for the switch to send configuration information to
the phone. CDP is enabled by default globally and on the interface.
Before you enable voice VLAN, we recommend you enable quality of service
(QoS) on the switch by entering the mls qos global configuration command and
configure the port trust state to trust by entering the mls qos trust cos
interface configuration command.
When you enter a VLAN ID, the IP phone forwards voice traffic in IEEE 802.1Q
frames, tagged with the specified VLAN ID. The switch puts IEEE 802.1Q voice
traffic in the voice VLAN.
When you select dot1q, none, or untagged, the switch puts the indicated
voice traffic in the access VLAN.
In all configurations, the voice traffic carries a Layer 2 IP precedence
value. The default is 5 for voice traffic.
When you enable port security on an interface that is also configured with a
voice VLAN, set the maximum allowed secure addresses on the port to two.
When the port is connected to a Cisco IP phone, the IP phone requires one
MAC address. The Cisco IP phone address is learned on the voice VLAN, but is
not learned on the access VLAN. If you connect a single PC to the Cisco IP
phone, no additional MAC addresses are required. If you connect more than
one PC to the Cisco IP phone, you must configure enough secure addresses to
allow one for each PC and one for the Cisco IP phone.
If any type of port security is enabled on the access VALN, dynamic port
security is automatically enabled on the voice VLAN.
You cannot configure static secure MAC addresses in the voice VLAN.
A voice-VLAN port cannot be a private-VLAN port.
The Port Fast feature is automatically enabled when voice VLAN is
configured. When you disable voice VLAN, the Port Fast feature is not
automatically disabled.
Examples
This example shows how to configure VLAN 2 as the voice VLAN for the port:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# switchport voice vlan 2
You can verify your settings by entering the show interfaces interface-id
switchport privileged EXEC command.
----- Original Message -----
From: "Mark N" <mneely_23@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, January 24, 2007 11:14 AM
Subject: IEWB-RS Vol 1 Lab 10 1.3
> Question:
>
> Cisco 7960 phones generating voip traffic with a 802.1P header and a layer
> 2 CoS of 5. Congiure the network so VoIP traffic received from the IP
> phones retains its COS and traffic received from the PC's connected to the
> access ports of the IP phones is marked with COS of 3.
>
> The solution guide gives the answer tailored to a 3550 switch, and I am
> using 3560.
>
> The solution guide answer is:
>
> int fa0/10
> switchport voice vlan dot1p
> switchport priority extend cos 3
> mls qos trust cos
>
> When I enter this in, I get the following output,
>
> Rack1SW1(config-if)#switchport voice vlan dot1p
> % Voice VLAN does not exist. Creating vlan 0
> Rack1SW1(config-if)#
> 20:05:51: %PM-2-VLAN_ADD: Failed to add VLAN 0 - VLAN not found.
>
> Does this behave differently on the 3550 platform? Should I create a
> voice vlan of 5 since this is the data vlan and there was no mention of a
> seperate voice vlan.
>
> Thanks for any input,
>
> Mark
>
>
>
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This archive was generated by hypermail 2.1.4 : Thu Feb 08 2007 - 23:46:57 ART