The voice VLAN feature is provided to
separate voice traffic from data traffic and assign higher priority to voice
traffic, thus decreasing voice transmission delay and jitter.
You can assign or remove a port to or from
the voice VLAN manually or have the switch do that dynamically by configuring
the automatic voice VLAN assignment mode on the port.
On a port configured with the automatic
voice VLAN assignment mode, the switch automatically assigns the port to the
voice VLAN when receiving a packet with the source MAC address matching a
recognizable voice device vendor OUI. As soon as the port is assigned to the
voice VLAN, an aging timer starts. If no recognizable voice traffic has been
received before the timer expires, the port is removed from the voice VLAN.
Figure 1-1 Network diagram for automatic
voice VLAN assignment configuration
As shown in Figure 1-1, PC is connected to
GigabitEthernet 1/0/1 of Switch A through IP phone 1, and IP phone 2 is
connected to GigabitEthernet 1/0/2 of Switch A. IP phone 1 sends out voice
traffic with the tag of the voice VLAN, while IP phone 2 sends out voice
traffic without any VLAN tag.
Configure the voice VLAN feature to satisfy
the following requirements:
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Configure VLAN 2 as the voice VLAN, and set the
aging time of the voice VLAN to 100 minutes. Use VLAN 6 to transmit user
service data.
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GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2
can recognize voice traffic automatically. Service data from PC and voice
traffic are assigned to different VLANs and then transmitted to the server and
the voice gateway respectively through Switch B.
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Because the OUI addresses of IP phone 1 and IP
phone 2 are not in the default voice device vendor OUI list of the switch, you
are required to add their OUI addresses 000f-e200-0000 and 000f-2200-0000 to
the OUI list. In addition, configure their descriptions as IP Phone1 and
IP Phone2 respectively.
|
Product Series
|
Software Version
|
Hardware Version
|
|
S3610 series Ethernet switches
|
Release 5301
|
All versions
|
|
S5510 series Ethernet switches
|
Release 5301
|
All versions
|
|
S5510-SI series Ethernet switches
|
Release 1207
|
All versions except S5500-20TP-SI
|
|
Release 1301
|
S5500-20TP-SI
|
|
S5510-EI series Ethernet switches
|
Release 2102
|
All versions
|
|
S7500E series Ethernet switches
|
Release 6100
|
All versions
|
# Create VLAN 2 and VLAN 6.
<SwitchA>
system-view
[SwitchA]
vlan 2
[SwitchA-vlan2]
quit
[SwitchA]
vlan 6
[SwitchA-vlan6]
quit
# Set the aging time for the voice VLAN.
[SwitchA] voice
vlan aging 100
# Add 000f-e200-0000 to the OUI address
list and configure its description as IP Phone1.
[SwitchA] voice
vlan mac-address 000f-e200-0000 mask ffff-ff00-0000 description IP Phone1
# Add 000f-2200-0000 to the OUI address
list and configure its description as IP Phone2.
[SwitchA] voice
vlan mac-address 000f-2200-0000 mask ffff-ff00-0000 description IP Phone2
# Configure VLAN 2 as the voice VLAN.
[SwitchA]
voice vlan 2 enable
# Configure the automatic voice VLAN
assignment mode on Ethernet 1/0/1. This step is optional, because the mode is
enabled by default.
[SwitchA]
interface GigabitEthernet 1/0/1
[SwitchA-GigabitEthernet1/0/1]
voice vlan mode auto
# Configure Ethernet 1/0/1 as a trunk port.
[SwitchA-GigabitEthernet1/0/1]
port link-type trunk
# Configure VLAN 6 as the default VLAN of
Ethernet 1/0/1 and configure Ethernet 1/0/1 to permit the packets of VLAN 6 to
pass through. (PC data will be transmitted in the VLAN.)
[SwitchA-GigabitEthernet1/0/1]
port trunk pvid vlan 6
[SwitchA-GigabitEthernet1/0/1]
port trunk permit vlan 6
# Enable voice VLAN on GigabitEthernet
1/0/1.
[SwitchA-GigabitEthernet1/0/1]
voice vlan enable
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After the configuration is completed, PC data
will be assigned to VLAN 6 (the data VLAN) on GigabitEthernet 1/0/1 for
transmission. When IP phone traffic arrives at GigabitEthernet 1/0/1, the port
automatically joins the voice VLAN and transmits the voice traffic with the
voice VLAN tag, so that IP phone 1 can receive packets normally.
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GigabitEthernet 1/0/1 can be a hybrid port. In
this case, you can follow the same configuration procedure except that you
should set the data VLAN as the default VLAN. When IP phone traffic arrives at
the port, the port automatically permits the voice VLAN and transmits the
traffic with the voice VLAN tag.
# Set the voice VLAN assignment mode of
GigabitEthernet 1/0/2 to manual. The manual mode must be adopted because the
voice traffic from IP phone 2 is untagged.
[SwitchA-GigabitEthernet1/0/1]
quit
[SwitchA]
interface GigabitEthernet 1/0/2
[SwitchA-GigabitEthernet1/0/2]
undo voice vlan mode auto
# Configure GigabitEthernet 1/0/2 to be an
access port and assign it to the voice VLAN.
[SwitchA-GigabitEthernet1/0/2]
port access vlan 2
# Enable voice VLAN on GigabitEthernet
1/0/2.
[SwitchA-GigabitEthernet1/0/2]
voice vlan enable
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You can set GigabitEthernet 1/0/2 as a trunk or
hybrid port. In either case, configure the voice VLAN as the default VLAN and
configure the port to remove the VLAN tag when forwarding traffic with the
voice VLAN tag.
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If traffic from IP phone 2 is tagged, configure GigabitEthernet
1/0/2 as a trunk or hybrid port and send the packets of VLAN 2 with the VLAN
tag.
#
vlan 1 to
2
#
vlan 6
#
interface
GigabitEthernet1/0/1
port
link-type trunk
port
trunk permit vlan 1 6
port trunk
pvid vlan 6
voice
vlan enable
#
interface
GigabitEthernet1/0/2
port
access vlan 2
undo
voice vlan mode auto
voice
vlan enable
#
voice
vlan aging 100
voice
vlan mac-address 000f-2200-0000 mask ffff-ff00-0000 description IP Phone2
voice
vlan mac-address 000f-e200-0000 mask ffff-ff00-0000 description IP Phone1
voice
vlan 2 enable
By default, the system maintains the OUI
list shown in Table 1-1.
You can remove or modify these pre-defined OUI addresses as needed.
Table 1-1 Default OUI addresses
preconfigured on the switch
|
No.
|
OUI Address
|
Vendor
|
|
1
|
0001-e300-0000
|
Siemens phones
|
|
2
|
0003-6b00-0000
|
Cisco phones
|
|
3
|
0004-0d00-0000
|
Avaya phones
|
|
4
|
00d0-1e00-0000
|
Pingtel phones
|
|
5
|
0060-b900-0000
|
Philips/NEC phones
|
|
6
|
00e0-7500-0000
|
Polycom phones
|
|
7
|
00e0-bb00-0000
|
3com phones
|
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To use a VLAN as a protocol VLAN and the voice
VLAN at the same time, ensure that the voice VLAN assignment mode on the port
to be associated with the protocol VLAN is not automatic mode. In automatic
mode, the port cannot be assigned to the voice VLAN manually and thus can cause
your attempt to associate the protocol VLAN with the port to fail.
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You cannot set the voice VLAN as the default
VLAN on a port in automatic voice VLAN assignment mode.
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The switch supports only one voice VLAN.
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Only a static VLAN can be configured as the
voice VLAN.
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In the voice VLAN operating in security mode,
the device allows only the packets whose source address matches a recognizable
voice device vendor OUI to pass through. All other packets, including
authentication packets such as 802.1x authentication packets, will be dropped.
Therefore, you are discouraged to transmit both voice and data in the voice
VLAN at the same time. If that is needed, disable the security mode of the
voice VLAN first.
