KBC Networks ESML8P-PC2 - Manual (Page 59)

Manual-ESML8P-PC2_Series-Rev1211
Copyright © KBC Networks Ltd.
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802.1Q VLAN
When the VLAN operation mode is set on 802.1Q, all ports on the switch belong to the default
VLAN of VID 1, which means they logically are regarded as members of the same broadcast
domain. The valid VLAN ID is in the range of number between 1 and 4094. The amount of VLAN
groups is up to 256 including the default VLAN that cannot be deleted.
GVRP (GARP VLAN Registration Protocol) is a protocol that facilitates control of VLANs within a
larger network. GVRP conforms to the IEEE 802.1Q specification, which defines a method of
tagging frames with VLAN configuration data. This allows network devices to dynamically
exchange VLAN configuration information with other devices. For example, with GVRP enabled,
the switches are able to automatically exchange the information of their VLAN database.
Therefore, the user needn’t manually configure the link type. The packets belonging to the same
VLAN can communicate across switches.
Each member port of 802.1Q is on either an Access Link (VLAN-tagged) or a Trunk Link (no
VLAN-tagged). All frames on an Access Link carry no VLAN identification. Conversely, all frames
on a Trunk Link are VLAN-tagged. Besides, there is the third mode—Hybrid. A Hybrid Link can
carry both VLAN-tagged frames and untagged frames. A single port is supposed to belong to a
particular VLAN group, except it is on a Trunk/Hybrid Link.
The technique of 802.1Q tagging inserts a 4-byte tag, including VLAN ID of the destination port—
PVID, in the frame. With the combination of Access/Trunk/Hybrid Links, the communication
across switches also can make the packet sent through tagged and untagged ports.
802.1Q Configuration
Please follow the instructions below to configure the 802.1Q VLAN.
• Click the pull-down menu to select 802.1Q and click Apply to configure the VLAN
Operation Mode on 802.1Q.
• Enable GVRP Protocol: Tick this checkbox to enable GVRP protocol. This checkbox is
available while the VLAN Operation Mode is set on 802.1Q.
• Management VLAN ID: Only the VLAN members, whose Untagged VID (PVID) equals to
the value specified in this field, have permission to access the switch. The default value is
‘0’ that means this limit is not enabled (all members in different VLANs can access this
switch).
• After you have configured the three parameters, click the Apply button right beneath this
area to finish creating an 802.1Q VLAN.