Auto Voice VLAN, Auto Smartports, CDP, and LLDP

Defaults

By factory defaults, CDP, LLDP, and LLDP-MED on the switch are enabled, manual Smartport mode is enabled, Basic QoS with trusted DSCP is enabled, and all ports are members of default VLAN 1, which is also the default Voice VLAN.

In addition, Dynamic Voice VLAN mode is the default to Auto Voice VLAN with enabling based on trigger, and Auto Smartport is the default to be enabled depending on Auto Voice VLAN.

Voice VLAN Triggers

When Dynamic Voice VLAN mode is Auto Voice VLAN enabled based on trigger, it means Auto Voice VLAN will become operational only if one or more triggers occur. Possible triggers are static voice VLAN configuration, voice VLAN information received in neighbor CDP advertisement, and voice VLAN information received in Voice VLAN Discovery Protocol (VSDP). If desired, an administrator can make Auto Voice VLAN mode operate immediately without waiting for a trigger.

When Auto Smartport is enabled depending on Auto Voice VLAN mode, it means Auto Smartport will be enabled when Auto Voice VLAN becomes operational. If desired, an administrator can enabled Auto Smartport independent of Auto Voice VLAN.

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 affect on any installations without a voice VLAN, and 200 and 300 series 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:

Auto Smartport works with CDP/LLDP to maintain the port memberships of the voice VLAN when voice end-points are detected from the ports: