Cisco Catalyst 2950 Command Reference

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
switchport voice vlan
switchport voice vlan
Use the switchport voice vlan interface configuration command to configure voice VLAN on the port.
Use the no form of this command to return to the default setting.
switchport voice vlan {vlan-id | dot1p | none | untagged}
no switchport voice vlan
Syntax Description
Defaults The switch default is not to automatically configure the telephone (none).
The telephone default is not to tag frames.
Command Modes Interface configuration
Command History
Usage Guidelines You should configure voice VLAN on access ports.
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 phone.
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 static secure MAC addresses on the voice VLAN.
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.
vlan-id VLAN used for voice traffic. The range is 1 to 4094.
dot1p The telephone uses priority tagging and uses VLAN 0 (the native VLAN). By
default, the Cisco IP phone forwards the voice traffic with an IEEE 802.1p priority
of 5.
none The telephone is not instructed through the command-line interface (CLI) about
the voice VLAN. The telephone uses the configuration from the telephone key
pad.
untagged The telephone does not tag frames and uses VLAN 4095. The default for the
telephone is untagged.
Release Modification
12.1(9)EA1 This command was introduced.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz