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Catalyst2950 and Catalyst2955 Switch Software Configuration Guide
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Chapter19 Configuring Voice VLAN Configuring Voice VLAN
Voice VLAN Configuration Guidelines
These are the voice VLAN configuration guidelines:
•You should configure voice VLAN on switch access ports.
•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.
•When you enable port security on an interface that is also configured with a voice VLAN, you must
set the maximum allowed secure addresses on the port to at least two.
•If any type of port security is enabled on the access VLAN, dynamic port security is automatically
enabled on the voice VLAN.
•You cannot configure port security on a per-VLAN basis.
•You cannot configure static secure or sticky secure MAC addresses on a voice VLAN.
•Voice VLAN ports can also be these port types:
–
Dynamic access port. See the “Configuring Dynamic Access Ports on VMPS Clients” section
on page 17-28 for more information.
–
Secure port. See the “Configuring Port Security” section on page 22-7 for more information.
–
802.1x authenticated port. See the “Using 802.1x with Voice VLAN Ports” section on page1 0-7
for more information.
Note If you enable 802.1x on an access port on which a voice VLAN i s configu re d and t o
which a Cisco IP Phone is connected, the Cisco IP Phone loses connectivity to the
switch for up to 30 seconds.
–
Protected port. See the “Configuring Protected Ports” section on page 22-4 for more
information.
Configuring a Port to Connect to a Cisco 7960 IP Phone
Because a Cisco 7960 IP Phone also supports a connection to a PC or other device, a port connecti ng the
switch to a Cisco 7960 IP Phone can carry mixed traffic.
You can configure the port to carry voice traffic in one of these ways:
•Configuring Ports to Carry Voice Traffic in 802.1Q Frames, page 19-4
•Configuring Ports to Carry Voice Traffic in 802.1p Priority-Tagged Frames, page 19-4
You can configure the IP phone to carry data traffic in one of these ways:
•Overriding the CoS Priority of Incoming Data Frames, page 19 -5
•Configuring the IP Phone to Trust the CoS Priority of Incoming Data Frames, page 19-6