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Chapter 36: VLAN Commands
Configuring Voice VLANs
– 1115 –
delays, packet loss, and jitter, which results in higher voice quality. This
is best achieved by assigning all VoIP traffic to a single VLAN.
•
VoIP traffic can be detected on switch ports by using the source MAC
address of packets, or by using LLDP (IEEE 802.1AB) to discover
connected VoIP devices. When VoIP traffic is detected on a configured
port, the switch automatically assigns the port as a tagged member of
the Voice VLAN.
•
Only one Voice VLAN is supported and it must already be created on the
switch before it can be specified as the Voice VLAN.
•
The Voice VLAN ID cannot be modified when the global auto-detection
status is enabled (see the
command.
E
XAMPLE
The following example enables VoIP traffic detection and specifies the Voice
VLAN ID as 1234.
Console(config)#voice vlan 1234
Console(config)#
voice vlan aging
This command sets the Voice VLAN ID time out. Use the
no
form to restore
the default.
S
YNTAX
voice vlan aging
minutes
no voice vlan
minutes
- Specifies the port Voice VLAN membership time out.
(Range: 5-43200 minutes)
D
EFAULT
S
ETTING
1440 minutes
C
OMMAND
M
ODE
Global Configuration
C
OMMAND
U
SAGE
The Voice VLAN aging time is the time after which a port is removed from
the Voice VLAN when VoIP traffic is no longer received on the port.
The VoIP aging time starts to count down when the OUI’s MAC address
expires from the MAC address table. Therefore, the MAC address aging
time should be added to the overall aging time. For example, if you
configure the MAC address table aging time to 30 seconds, and voice VLAN
aging time to 5 minutes, then after 5.5 minutes, a port will be removed
from the voice VLAN when VoIP traffic is no longer received on the port.
Alternatively, if you clear the MAC address table manually, then the switch
will also start counting down the voice VLAN aging time.
Summary of Contents for SSE-G2252
Page 42: ...44 General IP Routing on page 627...
Page 603: ...Chapter 16 IP Configuration Setting the Switch s IP Address IP Version 6 609...
Page 883: ...Chapter 24 General Security Measures Port based Traffic Segmentation 894...
Page 989: ...Chapter 30 Congestion Control Commands Automatic Traffic Control Commands 1000 Console...
Page 1007: ...Chapter 33 Address Table Commands 1019...
Page 1137: ...Chapter 38 Quality of Service Commands 1150...