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Forbidden—The interface is not allowed to join the VLAN . When a port is
not a member of any other VLAN, enabling this option on the port makes
the port part of internal VLAN 4095 (a reserved VID) .
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Excluded—The interface is currently not a member of the VLAN . This is the
default for all the ports and LAGs when the VLAN is newly created .
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Tagged—The interface is a tagged member of the VLAN .
Untagged—The interface is an untagged member of the VLAN . Frames of
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the VLAN are sent untagged to the interface VLAN .
STEP 4 Click Apply . The interfaces are assigned to the VLAN, and written to the
Running Configuration file .
You can continue to display and/or configure port membership of another VLAN
by selecting another VLAN ID .
Voice VLAN
This section covers the following topics:
Overview
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Feature Configuration
Telephony OUI Interfaces
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Overview
In a LAN, voice devices, such as IP phones, VoIP endpoints, and voice systems
are placed into the same VLAN . This VLAN is referred as the voice VLAN .
If the voice devices are in different voice VLANs, IP (Layer 3) routers are needed to
provide communication .
The device supports a single voice VLAN . By default, the voice VLAN is VLAN 1 . A
different voice VLAN can be manually configured .
Telephony Organizationally Unique Identifier
Telephony OUIs are assigned by the Institute of Electrical and Electronics
Engineers, Incorporated (IEEE) Registration Authority . Since the number of IP
phone manufacturers is limited and well-known, the known OUI values cause
the relevant frames, and the port on which they are seen, to be automatically
assigned to the Voice VLAN . The OUI Global table can hold up to 128 OUIs .
Chapter 6 VLAN Management
When a port is manually configured as a candidate to join the voice VLAN, the
device dynamically adds the port to the voice VLAN if it receives a packet with a
source MAC address matching to one of the configured telephony OUIs . An OUI
is the first three bytes of an Ethernet MAC address .
Voice End-Points
For a voice VLAN work properly, voice devices, such as IP phones and VoIP
endpoints, must be assigned to the voice VLAN where it sends and receives its
voice traffic . Some of the possible scenarios are as follows:
A phone/endpoint may be statically configured with the voice VLAN .
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A phone/endpoint may obtain the voice VLAN in the boot file it downloads
from a TFTP server . A DHCP server may specify the boot file and the TFTP
server when it assigns an IP address to the phone .
The device expects the attaching voice devices to send voice VLAN, tagged
packets . On ports where the voice VLAN is also the native VLAN, voice VLAN
untagged packets are possible .
Voice VLAN QoS
Working with the OUI mode, the device can additionally configure the mapping
and remarking (CoS/802 . 1 p) of the voice traffic based on the OUI .
By default, all interfaces are CoS/802 . 1 p trusted . The device applies the quality of
service based on the CoS/802 . 1 p value found in the voice stream . For Telephony
OUI voice streams, you can override the quality of service and optionally remark
the 802 . 1 p of the voice streams by specifying the desired CoS/802 . 1 p values and
using the remarking option under Telephony OUI .
Voice VLAN Constraints
The following constraints exist:
Only one Voice VLAN is supported .
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A VLAN that is defined as a Voice VLAN cannot be removed
The Voice VLAN cannot be the default VLAN .
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The Voice VLAN QoS decision has priority over any other QoS decision,
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except for the Policy decision .
A new VLAN ID can be configured for the Voice VLAN only if the current
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Voice VLAN does not have candidate ports .
The interface VLAN of a candidate port must be in Trunk mode .
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