Cisco Small Business 200 Series Administration Manual page 188
Small business 200 series smart switch
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Also See for Small Business 200 Series:
- User manual (428 pages) ,
- Administration manual (202 pages) ,
- Quick start manual (72 pages)
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VLAN Management
Voice VLAN
From a VLAN perspective, the above models operate in both VLAN-aware and VLAN-unaware
environments. In the VLAN-aware environment, the voice VLAN is one of the many VLANs configured in an
installation. The VLAN-unaware scenario is equivalent to a VLAN-aware environment with only one VLAN.
The device always operates as a VLAN-aware switch.
The device supports a single voice VLAN. By default, the voice VLAN is VLAN 1. The voice VLAN is
defaulted to VLAN 1. A different voice VLAN can be manually configured. It can also be dynamically
learned when Auto Voice VLAN is enabled.
Ports can be manually added to the voice VLAN by using basic VLAN configuration described in the
Configuring VLAN Interface Setting section, or by manually applying voice-related Smartport macro to the
ports. Alternatively, they can be added dynamically if the device is in Telephony OUI mode, or has Auto
Smartports enabled.
Dynamic Voice VLAN Modes
The device supports two dynamic voice VLAN modes: Telephony OUI (Organization Unique Identifier)
mode and Auto Voice VLAN mode. The two modes affect how voice VLAN and/or voice VLAN port
memberships are configured. The two modes are mutually exclusive to each other.
•
Telephony OUI
In Telephony OUI mode, the voice VLAN must be a manually-configured VLAN, and cannot be the
default VLAN.
When the device is in Telephony OUI mode and 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. For more information about Telephony OUI, see
•
Auto Voice VLAN
In Auto Voice VLAN mode, the voice VLAN can be either the default voice VLAN, manually
configured, or learned from external devices such as UC3xx/5xx and from switches that advertise
voice VLAN in CDP or VSDP. VSDP is a Cisco defined protocol for voice service discovery.
Unlike Telephony OUI mode that detects voice devices based on telephony OUI, Auto Voice VLAN
mode depends on Auto Smartport to dynamically add the ports to the voice VLAN. Auto Smartport,
if enabled, adds a port to the voice VLAN if it detects an attaching device to the port that advertises
itself as a phone or media end points through CDP and/or LLDP-MED.
Voice End-Points
To have a voice VLAN work properly, the voice devices, such as Cisco 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:
Cisco Small Business 200 Series Smart Switch Administration Guide
14
Telephony
OUI.
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