VLAN Management
Voice VLAN
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Cisco Small Business 200 Series Smart Switch Administration Guide
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NOTE
The default configuration list here applies to switches whose firmware version
supports Auto Voice VLAN out of the box. It also applies to unconfigured switches
that have been upgraded to the firmware version that supports Auto Voice VLAN.
NOTE
The defaults and the voice VLAN triggers are designed to have no effect on any
installations without a voice VLAN and on switches that have already been
configured. You may manually disable and enable Auto Voice VLAN and/or Auto
Smartport to fit your deployment if needed.
Auto Voice VLAN
Auto Voice VLAN is responsible to maintain the voice VLAN, but depends on Auto
Smartport to maintain the voice VLAN port memberships. Auto Voice VLAN
performs the following functions when it is in operation:
•
It discovers voice VLAN information in CDP advertisements from directly
connected neighbor devices.
•
If multiple neighbor switches and/or routers, such as Cisco Unified
Communication (UC) devices, are advertising their voice VLAN, the voice
VLAN from the device with the lowest MAC address is used.
NOTE
If connecting the device to a Cisco UC device, you may need to
configure the port on the UC device using the
switchport voice vlan
command to ensure the UC device advertises its voice VLAN in CDP at the
port.
•
It synchronizes the voice VLAN-related parameters with other Auto Voice
VLAN-enabled switches, using Voice Service Discovery Protocol (VSDP).
The device always configures itself with the voice VLAN from the highest
priority source it is aware of. The priority is based on the source type and
MAC address of the source providing the voice VLAN information. Source
type priority from high to low are static VLAN configuration, CDP
advertisement, and default configuration based on changed default VLAN,
and default voice VLAN. A numeric low MAC address is of higher priority
than a numeric high MAC address.
•
It maintains the voice VLAN until a new voice VLAN from a higher priority
source is discovered or until the Auto Voice VLAN is restarted by the user.
When restarted, the device resets the voice VLAN to the default voice
VLAN and restarts the Auto Voice VLAN discovery.
•
When a new voice VLAN is configured/discovered, the device automatically
creates it, and replaces all the port memberships of the existing voice VLAN
to the new voice VLAN. This may interrupt or terminate existing voice
sessions, which is expected when network topology is altered.
Содержание Small Business 200
Страница 1: ...Cisco Small Business 200 Series Smart Switch Administration Guide Release 1 3 ADMINISTRATION GUIDE ...
Страница 13: ...Cisco Small Business 200 Series Smart Switch Administration Guide 13 Contents ...
Страница 24: ...Getting Started Window Navigation 11 Cisco Small Business 200 Series Smart Switch Administration Guide 1 ...
Страница 38: ...Status and Statistics Managing RMON 25 Cisco Small Business 200 Series Smart Switch Administration Guide 2 ...
Страница 124: ...Administration Discovery Configuring CDP 111 Cisco Small Business 200 Series Smart Switch Administration Guide 8 ...
Страница 144: ...Port Management Configuring Green Ethernet 131 Cisco Small Business 200 Series Smart Switch Administration Guide 9 ...
Страница 182: ...Port Management PoE Configuring PoE Settings 169 Cisco Small Business 200 Series Smart Switch Administration Guide 11 ...
Страница 206: ...VLAN Management Voice VLAN 193 Cisco Small Business 200 Series Smart Switch Administration Guide 12 ...
Страница 288: ...Security Denial of Service Prevention 275 Cisco Small Business 200 Series Smart Switch Administration Guide 17 ...