Cisco Sg3008 Manual

							VLAN Management
Vo i c e  V L A N
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By default, all interfaces are CoS/802.1p trusted.   The device applies the quality of 
service based on the CoS/802.1p value found in the voice stream. In Auto Voice 
VLAN, you can override the value of the voice streams using advanced QoS.   For 
Telephony OUI voice streams, you can override the quality of service and 
optionally remark the 802.1p of the voice streams by specifying the desired CoS/
802.1p values and using the remarking option under Telephony OUI.
Voice VLAN Constraints
The following constraints exist:
•Only one Voice VLAN is supported.
•A VLAN that is defined as a Voice VLAN cannot be removed
In addition the following constraints are applicable for Telephony OUI:
•The Voice VLAN cannot be VLAN1 (the default VLAN).
•The Voice VLAN cannot be Smartport enabled.
•The Voice VLAN cannot support DVA (Dynamic VLAN assignment).
•The Voice VLAN cannot be the Guest VLAN if the voice VLAN mode is OUI. 
If the voice VLAN mode is Auto, then the Voice VLAN can be the Guest 
VLAN.
•The Voice VLAN QoS decision has priority over any other QoS decision, 
except for the Policy/ACL QoS decision.
•A new VLAN ID can be configured for the Voice VLAN only if the current 
Voice VLAN does not have candidate ports.
•The interface VLAN of a candidate port must be in General or Trunk mode. 
•The Voice VLAN QoS is applied to candidate ports that have joined the 
Voice VLAN, and to static ports.
•The voice flow is accepted if the MAC address can be learned by the 
Forwarding Database (FDB). (If there is no free space in FDB, no action 
occurs).
Voice VLAN Workflows
The device default configuration on Auto Voice VLAN, Auto Smartports, CDP, and 
LLDP cover most common voice deployment scenarios.   This section describes 
how to deploy voice VLAN when the default configuration does not apply. 
						

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Workflow1: To configure Auto Voice VL AN:
STEP 1Open the VLAN Management > Voice VLAN > Properties page.
STEP  2Select the Voice VLAN ID. It cannot be set to VLAN ID 1 (this step is not required for 
dynamic Voice VLAN).
STEP  3Set Dynamic Voice VLAN to Enable Auto Voice VLAN.
STEP  4Select the Auto Voice VLAN Activation method.
NOTEIf the device is currently in Telephony OUI mode, you must disable it 
before you can configure Auto Voice Vlan 
STEP  5Click Apply.
STEP  6Configure Smartports as described in the Common Smartport Tasks section.
STEP  7Configure LLDP/CDP as described in the Configuring LLDP and Configuring 
CDP sections, respectively.
STEP  8Enable the Smartport feature on the relevant ports using the Smartport > Interface 
Settings page. 
NOTEStep 7 and Step 8 are optional as they are enabled by default.
Workflow2: To configure the Telephony OUI Method
STEP 1Open the VLAN Management > Voice VLAN > Properties page. Set Dynamic Voice 
VLAN to Enable Telephony OUI.
NOTEIf the device is currently in Auto Voice VLAN mode, you must disable 
it before you can enable Telephony OUI. 
STEP  2Configure Telephony OUI in the Telephony OUI page.
STEP  3Configure Telephony OUI VLAN membership for ports in the Telephony OUI 
Interface page.
Configuring Voice VLAN
This section describes how to configure voice VLAN. It covers the following 
topics: 
						

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•Configuring Voice VLAN Properties
•Displaying Auto Voice VLAN Settings
•Configuring Telephony OUI
Configuring Voice VLAN Properties
Use the Voice VLAN Properties page for the following:
•View how voice VLAN is currently configured.
•Configure the VLAN ID of the Voice VLAN.
•Configure voice VLAN QoS settings.
•Configure the voice VLAN mode (Telephony OUI or Auto Voice VLAN).
•Configure how Auto Voice VLAN is triggered.
To view and configure Voice VLAN properties:
STEP 1Click VLAN Management > Voic e VL AN > Properties.
•The voice VLAN settings configured on the device are displayed in the Vo i c e  
VLAN Settings (Administrative Status) block. 
•The voice VLAN settings that are actually being applied to the voice VLAN 
deployment are displayed in the Voice VLAN Settings (Operational Status) 
block. 
STEP  2Enter values for the following fields:
•Voic e VL AN ID—Enter the VLAN that is to be the Voice VLAN.
NOTEChanges in the voice VLAN ID, CoS/802.1p, and/or DSCP cause the 
device to advertise the administrative voice VLAN as a static voice VLAN. If 
the option 
Auto Voice VLAN Activation triggered by external Voice VLAN is 
selected, then the default values need to be maintained.
•CoS/802.1p —Select a CoS/802.1p value that to be used by LLDP-MED as 
a voice network policy. Refer to 
Administration > Discovery > LLDP > LLDP 
MED Network Policy 
for additional details.
•DSCP—Selection of DSCP values that to be used by the LLDP-MED as a 
voice network policy. Refer to 
Administration > Discovery > LLDP > LLDP 
MED Network Policy 
for additional details. 
						

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•Dynamic Voice VLAN—Select this field to disable or enable voice VLAN 
feature in one of the following ways:
-
Enable Auto Voice VLAN—Enable Dynamic Voice VLAN in Auto Voice 
VLAN mode.
-
Enable Telephony OUI—Enable Dynamic Voice VLAN in Telephony OUI 
mode.
-
Disable—Disable Auto Voice Vlan or Telephony OUI.
•Auto Voice VLAN Activation—If Auto Voice VLAN was enabled, select one 
of the following options to activate Auto Voice VLAN:
-
Immediate—Auto Voice VLAN on the device is to be activated and put 
into operation immediately if enabled.
-
By External Voice VLAN Trigger—Auto Voice VLAN on the device is 
activated and put into operation only if the device detects a device 
advertising the voice VLAN.
NOTEManually re-configuring the voice VLAN ID, CoS/802.1p, and/or DSCP 
from their default values results in a static voice VLAN, which has higher 
priority than auto voice VLAN that was learned from external sources.
STEP  3Click Apply. The VLAN properties are written to the Running Configuration file.
Displaying Auto Voice VLAN Settings
If Auto Voice VLAN mode is enabled, use the Auto Voice VLAN page to view the 
relevant global and interface parameters. 
You can also use this page to manually restart Auto Voice VLAN, by clicking 
Restart Auto Voice VLAN. After a short delay, this resets the voice VLAN to the 
default voice VLAN and restarts the Auto Voice VLAN discovery and 
synchronization process on all the switches in the LAN that are Auto Voice VLAN 
enabled. 
NOTEThis only resets the voice VLAN to the default voice vlan if the Source Type is in the 
Inactive state.
To view Auto Voice VLAN parameters: 
						

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Vo i c e  V L A N
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STEP 1Click VLAN Management > Voic e VL AN > Auto Voice VLAN.
The Operation Status block on this page shows the information about the current 
voice VLAN and its source:
•Auto Voice VLAN Status—Displays whether Auto Voice VLAN is enabled.
•Voic e VL AN ID—The identifier of the current voice VLAN
•Source Type—Displays the type of source where the voice VLAN is 
discovered by the root device.
•CoS/802.1p—Displays CoS/802.1p values to be used by the LLDP-MED as 
a voice network policy. 
•DSCP—Displays DSCP values to be used by the LLDP-MED as a voice 
network policy. 
•Root Switch MAC Address—The MAC address of the Auto Voice VLAN root 
device that discovers or is configured with the voice VLAN from which the 
voice VLAN is learned.
•Switch MAC Address—Base MAC address of the device. If the devices 
Switch MAC address is the Root Switch MAC Address, the device is the 
Auto Voice VLAN root device.
•Voic e VL AN ID Change Time—Last time that voice VLAN was updated.
STEP  2Click Restart Auto Voice VLAN to reset the voice VLAN to the default voice VLAN 
and restart Auto Voice VLAN discovery on all the Auto-Voice-VLAN-enabled 
switches in the LAN.
The Voice VLAN Local Table displays voice VLAN configured on the device, as 
well as any voice VLAN configuration advertised by directly-connected neighbor 
devices. It contains the following fields:
•Interface—Displays the interface on which voice VLAN configuration was 
received or configured. If N/A appears, the configuration was done on the 
device itself. If an interface appears, a voice configuration was received from 
a neighbor.
•Source MAC Address— MAC address of a UC from which the voice 
configuration was received.
•Source Type— Type of UC from which voice configuration was received. 
The following options are available:
-Default—Default voice VLAN configuration on the device 
						

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-Static—User-defined voice VLAN configuration defined on the device.
-CDP—UC that advertised voice VLAN configuration is running CDP.
-LLDP—UC that advertised voice VLAN configuration is running LLDP.
-Voice VL AN ID—The identifier of the advertised or configured voice 
VLAN
•Voic e VL AN ID—The identifier of the current voice VLAN.
•CoS/802.1p—The advertised or configured CoS/802.1p values that are 
used by the LLDP-MED as a voice network policy. 
•DSCP—The advertised or configured DSCP values that are used by the 
LLDP-MED as a voice network policy. 
•Best Local Source—Displays whether this voice VLAN was used by the 
device. The following options are available:
-Ye s—The device uses this voice VLAN to synchronize with other Auto 
Voice VLAN-enabled switches. This voice VLAN is the voice VLAN for the 
network unless a voice VLAN from a higher priority source is discovered.   
Only one local source is the best local source.
-No—This is not the best local source.
STEP  3Click Refresh to refresh the information on the page
Configuring Telephony OUI
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 a 
Vo ic e  V L A N .
The OUI Global table can hold up to 128 OUIs.
This section covers the following topics:
•Adding OUIs to the Te l e p h o n y  O U I  Ta b l e
•Adding Interfaces to Voice VLAN on Basis of OUIs 
						

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Adding OUIs to the Telephony OUI Table
Use the Telephony OUI page to configure Telephony OUI QoS properties. In 
addition, the Auto Membership Aging time can be configured. If the specified time 
period passes with no telephony activity, the port is removed from the Voice 
VLAN. 
Use the Telephony OUI page to view existing OUIs, and add new OUIs. 
To configure Telephony OUI and/or add a new Voice VLAN OUI:
STEP 1Click VLAN Management > Voic e VL AN > Te l e p h o n y  O U I.
The Telephony OUI page contains the following fields:
•Telephony OUI Operational Status—Displays whether OUIs are used to 
identify voice traffic.
•CoS/802.1p—Select the CoS queue to be assigned to voice traffic.
•Remark CoS/802.1p—Select whether to remark egress traffic.
•Auto Membership Aging Time—Enter the time delay to remove a port from 
the voice VLAN after all of the MAC addresses of the phones detected on the 
ports have aged out.
STEP  2Click Apply to update the Running Configuration of the device with these values.
The Telephony OUI table appears:
•Te l e p h o n y  O U I—First six digits of the MAC address that are reserved for 
OUIs.
•Description—User-assigned OUI description.
STEP  3Click Restore OUI Defaults to delete all of the user-created OUIs, and leave only 
the default OUIs in the table. 
To delete all the OUIs, select the top checkbox. All the OUIs are selected and can 
be deleted by clicking Delete. If you then click Restore, the system recovers the 
known OUIs.
STEP  4To add a new OUI, click Add.
STEP  5Enter the values for the following fields:
•Te l e p h o n y  O U I—Enter a new OUI.
•Description—Enter an OUI name. 
						

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STEP  6Click Apply. The OUI is added to the Telephony OUI Table.
Adding Interfaces to Voice VLAN on Basis of OUIs
The QoS attributes can be assigned per port to the voice packets in one of the 
following modes:
•All—Quality of Service (QoS) values configured to the Voice VLAN are 
applied to all of the incoming frames that are received on the interface and 
are classified to the Voice VLAN.
•Telephony Source MAC Address (SRC)—The QoS values configured for 
the Voice VLAN are applied to any incoming frame that is classified to the 
Voice VLAN and contains an OUI in the source MAC address that matches a 
configured telephony OUI.
Use the Telephony OUI Interface page to add an interface to the voice VLAN on 
the basis of the OUI identifier and to configure the OUI QoS mode of voice VLAN. 
To configure Telephony OUI on an interface:
STEP 1Click VLAN Management > Voic e VL AN > Telephony OUI Interface.
The Telephony OUI Interface page contains voice VLAN OUI parameters for all 
interfaces.
STEP  2To configure an interface to be a candidate port of the telephony OUI-based voice 
VLAN, click Edit.
STEP  3Enter the values for the following fields:
•Interface—Select an interface.
•Telephony OUI VLAN Membership—If enabled, the interface is a candidate 
port of the telephony OUI based voice VLAN.   When packets that match one 
of the configured telephony OUI are received, the port is added to the voice 
VLAN.
•Telephone OUI QoS Mode—Select one of the following options:
-All—QoS attributes are applied on all packets that are classified to the 
Vo ic e  V L A N .
-Telephony Source MAC Address—QoS attributes are applied only on 
packets from IP phones. 
						

							VLAN Management
Access Port Multicast TV VLAN
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STEP  4Click Apply. The OUI is added.
Access Port Multicast T V VLAN
Multicast TV VLANs enable Multicast transmissions to subscribers who are not on 
the same data VLAN (Layer 2-isolated), without replicating the Multicast 
transmission frames for each subscriber VLAN. 
Subscribers, who are not on the same data VLAN (Layer 2-isolated) and are 
connected to the device with different VLAN ID membership. can share the same 
Multicast stream by joining the ports to the same Multicast VLAN ID. 
The network port, connected to the Multicast server, is statically configured as a   
member in the Multicast VLAN ID. 
The network ports, which through subscribers communicate with the Multicast 
server (by sending IGMP messages), receive the Multicast streams from the 
Multicast server, while including the Multicast TV VLAN in the Multicast packet 
header. For this reasons, the network ports must be statically configured as the 
following:
•Trunk or general port type (see Configuring VLAN Interface Settings)
•Member on the Multicast TV VLAN
The subscriber receiver ports can be associated with the Multicast TV VLAN only 
if it is defined in one of the two following types:
•Access port
•Customer port (see Customer Port Multicast T V VLAN)
One or more IP Multicast address groups can be associated with the same 
Multicast TV VLAN. 
Any VLAN can be configured as a Multicast-TV VLAN. A port assigned to a 
Multicast-TV VLAN:
•Joins the Multicast-TV VLAN.
•Packets passing through egress ports in the Multicast TV VLAN are 
untagged. 
						

							VLAN Management
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•The port’s Frame Type parameter is set to Admit All, allowing untagged 
packets (see Configuring VLAN Interface Settings).
The Multicast TV VLAN configuration is defined per port. Customer ports are 
configured to be member of Multicast TV VLANs using the Multicast TV VLAN 
Page.
IGMP Snooping
Multicast TV VLAN relies on IGMP snooping, which means that:
•Subscribers use IGMP messages to join or leave a Multicast group.
•Device performs IGMP snooping and configures the access port according 
to its Multicast membership on Multicast TV VLAN
.
The device decides for each IGMP packet that is received on an access port 
whether to associate it with the access VLAN or with the Multicast TV VLAN 
according to the following rules:
•If an IGMP message is received on an access port, with destination 
Multicast IP address that is associated with the port’s Multicast TV VLAN, 
then the software associates the IGMP packet with the Multicast TV VLAN. 
•Otherwise the IGMP message is associated to the access VLAN and the 
IGMP message is only forwarded within that VLAN.
•The IGMP message is discarded if:
-The STP/RSTP state on the access port is discard.
-The MSTP state for the access VLAN is discard.
-The MSTP state for the Multicast TV VLAN is discard, and the IGMP 
message is associated with this Multicast TV VLAN.
Differences Between Regular and Multicast T V VLANs
Characteristics of Regular vs. Multicast T V VLANs
Regular VLAN Multicast T V VLAN
VLAN Membership Source and all receiver 
ports must be static 
members in the same 
data VLAN.Source and receiver ports 
cannot be members in the 
same data VLAN.