Yealink Yealink SIP-T48G, Руководство администратора, Страница: 163 / 319

Configuring Advanced Features
151
This chapter provides information for making configuration changes for the following
advanced features:

VLAN

Voice Quality Monitoring

Quality of Service

SNMP

IPv6 Support
VLAN (Virtual Local Area Network) is used to logically divide a physical network into
several broadcast domains. VLAN membership can be configured through software
instead of physically relocating devices or connections. Grouping devices with a
common set of requirements regardless of their physical location can greatly simplify
network design. VLANs can address issues such as scalability, security and network
management.
The purpose of VLAN configurations on the IP phone is to insert tag with VLAN
information to the packets generated by the IP phone. When VLAN is properly
configured for the ports (Internet port and PC port) on the IP phone, the IP phone will tag
all packets from these ports with the VLAN ID. The switch receives and forwards the
tagged packets to the corresponding VLAN according to the VLAN ID in the tag as
described in IEEE Std 802.3.
VLAN on IP phones allows simultaneous access for a regular PC. This feature allows a PC
to be daisy chained to an IP phone and the connection for both PC and IP phone to be
trunked through the same physical Ethernet cable.
In addition to manual configuration, the IP phone also supports automatic discovery of
VLAN via LLDP, CDP or DHCP. The assignment takes effect in this order: assignment via
LLDP/CDP, manual configuration, then assignment via DHCP.
For more information on VLAN, refer to VLAN Feature on Yealink IP Phones , available
online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142 .
LLDP (Linker Layer Discovery Protocol) is a vendor-neutral Link Layer protocol, which
allows IP phones to receive and/or transmit device-related information from/to directly
connected devices on the network that are also using the protocol, and store the