20
In chart 1, there is a layer 2 switches without setting VLAN. Any broadcast frame will be transmitted to the
other ports except the send port. For example, a broadcast information is sent out from port 1 then
transmitted to port 2,3and 4.
In chart 2, red and blue indicate two different VLANs in the switch, and port 1 and port 2 belong to red
VLAN, port 3 and port 4 belong to blue VLAN. If a broadcast frame is sent out from port 1, switch will
transmit it to port 2, the other port in the red VLAN and not transmit it to port3 and port 4 in blue VLAN. By
this means, VLAN divide the broadcast domain viare stricting the range of broadcast frame transmition.
Note: chart 2 use red and blue to identify the different VLAN, but in practice, VLAN uses different VLAN
IDs to identify.
QoS Configuration
Field name
explanation
Enable LLDP
Enable LLDP by selecting it
Packet Interval
The time interval of sending LLDP Packet
Enable Learning
Function
After enabling LLDP Learn, telephone can automatically learn the
data of DSCP, 802.1p, VLAN ID from the switch. If the data is
different from the data of the LLDP server, telephone will change
its own value as the value of the switch
(
Synchronous with VLAN
in switch
)
Enable DSCP
Enable Dscp by selecting it
SIPDSCP
Specify the value of the SIP DSCP