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ManualsBrandsCisco ManualsComputer equipment2955T 12 - Catalyst Switch
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17-3
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-07
Chapter 17 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 secure addresses. 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 15-29 for more information.
–
Secure port. See the “Configuring Port Security” section on page 19-4 for more information.
–
802.1X authenticated port. See the “Voice VLAN Ports” section on page 10-5 for more
information.
–
Protected port. See the “Configuring Protected Ports” section on page 19-3 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 connecting 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 17-4
• Configuring Ports to Carry Voice Traffic in 802.1P Priority-Tagged Frames, page 17-4
You can configure the IP phone to carry data traffic in one of these ways:
• Overriding the CoS Priority of Incoming Data Frames, page 17-5
• Configuring the IP Phone to Trust the CoS Priority of Incoming Data Frames, page 17-6