Major Benefits of Using VLANs
VLANs offer many benefits that are not found in typical LANs. Major benefits of
segregating IP phones into VLAN(s) are listed as below:
Performance Enhancements: VLAN is used to minimize the broadcast domain.
Creating smaller domain for IP phone can reduce overhead and limit resource
utilization. Additionally, less traffic will need to be routed, and the latency added
by routers will be reduced.
Ease of Administration: Much of the cost associated with network additions and
relocations can be saved through the use of VLANs. IP phone can be shifted from
one workgroup or department to another without installing new network cabling
and reconfiguring hubs or routers.
Security: VLANs can be used to create secure user groups and prevent others
outside of the broadcast domain from receiving sensitive data of the IP phone.
They can also be used to enhance firewall functions and restrict network access for
one or more users. By segregating IP phones into VLANs, security filters can be
implemented in the network to prevent the IP phones from receiving unnecessary
traffic from other devices. This helps prevent disruption due to DoS attacks or attempts to compromise the devices. It also allows locking down access to
configuration and servers to only allow access from the IP phones.
Yealink IP Phones Compatible with VLANMethod
There arefourways toget VLANIDfor Internet (WAN) port,but the VLAN used is chosen by the priority of each method(from highest to lowest): LLDP/CDP>Manual>DHCPVLAN.There is only one way to getVLAN ID for PC port: Manual.Yealink SIP VP-T49G IP phones support VLAN in the wireless network. The method that the phones use to obtain VLAN ID in the wireless network is the same as the one in the wired network.
Note
LLDP and CDP methods have the same priority to get VLAN ID. Normally, the VLAN ID get for the IP phoneby LLDP and CDP methods will be the same.
Thetablebelow lists the methods supported by Yealink SIP IP phones with different versions.
VLANDiscoveryMethod on Yealink IP Phones
Automatic DiscoveryMethodforVLAN
LLDP Introduction
LLDP(Link Layer Discovery Protocol)allows IP phonesto receive and/or transmit device-related information to directly connected devices on the network that arealso using the protocol, and store the information that is learned about other devices. Information gathered with LLDP isstored in the device as a management information database (MIB) and can be queried with the Simple Network Management Protocol (SNMP) as specified in RFC 2922. LLDP transmits the information as packets called LLDP Data Units (LLDPDUs). An LLDPDU consists of a set of Type-Length-Value(TLV) elements, each of which contains a particular type of information about the device or port transmitting it.
Each of the TLV components has the following basic structure：
LLDP supports advertising the followingTLVs:
Mandatory LLDP TLVs: Chassis ID, Port ID, and Time to Live (TTL) are included in an LLDPDU by default.
Optional LLDP TLVs: System Name, System Description and so on, the phone sends the optional TLVs along with the mandatory TLVs in an LLDPDU.
Organizationally Specific TLVs: MAC/PHY Configuration/Statusand Port VLAN ID, which are defined inIEEE Standard 802.3 and 802.1 respectively.The LLDP frame ends with a special TLV, named end of LLDPDUin which both the typeand lengthfields are 0.
LLDP-MED
LLDP-MED(Media Endpoint Discovery)is published by the Telecommunications Industry Association (TIA). Itis an extension to LLDP that operates between endpoint devices and network connectivity devices. LLDP-MEDspecifically provides support for voice over IP (VoIP) applicationsandprovides the following capabilities:
Capabilities Discovery—allows LLDP-MED endpoints to determine the capabilities that the connected device supports and has enabled.It can be used to indicate whether the connected device is a phone, a switch, a repeater, etc.
Voice VLAN Configuration—provides a mechanism for a switch to notify a device which VLAN to use, which enables “plug and play” networking.
Power Management—provides information related to how the device is powered, power priority, and how much power the device needs.
Inventory Management—provides a means to manage device and the attributes of the device such as model number, serial number, software revision, etc.
Location Identification Discovery—provides location information from the switch to the device when placingan emergency call.
In addition to the TLVs advertised by LLDP, LLDP-MED also supports advertising the following TLVs:
It should be noted that either LLDP or LLDP-MED—but not both—can be used at any given time on an interface between two devices
LLDP Feature on Yealink IP Phones
LLDPprovidesexceptional interoperability benefits, IP telephony troubleshooting, automatic deployment of policiesandadvanced PoE(Power over Ethernet). When LLDP feature is enabled on IP phones, the IP phones periodically advertisetheir own information to the directly connected LLDP-enabled switch. The IP phones can also receive LLDP packets from the connectedswitch. When the application type is “voice”, IP phones decide whether to update the VLAN configurations obtained from the LLDP packets. When the VLAN configurations on the IP phones are different from the ones sent by the switch, the IP phones perform anupdate and reboot. This allows the IP phones to be pluggedinto any switch, obtain their VLAN IDs, and then start communications with the call contro
Supported TLVs of IP Phones
TLVs supported by IP phones are summarized in the following table:
...
Download pdf :Click Here>
Yealink IP Phones Elevate the Experience in Diverse Hybrid Work Environments
Front Desk
Well-rounded Office Phone & Cost-effective WiFi IP phone
