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VLAN type
In VLAN function supported by this device, VLAN can be divided in following 2 units.
•Port VLAN
It is the function that executes grouping in port unit. Addresses for all the network protocols can be given.
•Protocol VLAN
It is a function that groups the ports on the basis of specific protocols.
Types of protocols that can be specified by protocol VLAN are as follows.
- IP
- IPv6
Furthermore, protocol VLAN of optional protocol can be created by directly specifying the frame type. Exanoke)
IPX (Ethernet II type EtherType:Value [0x8137,0x8138] specification)
Relationship between VLAN tag and port
When VLAN function is used, it is defined whether VLAN tag is attached at the time of sending the frame to
port in VLAN in advance. Whether to attach or not is determined according to whether the node which is at the
end of each port can identify the VLAN tag.
When VLAN function is used, segment which is connected to the end of each port of this device belongs to any
one of the following 3.
•Access link
It is the section where only the frames with no VLAN tag flow. End node which cannot recognize VLAN tag is
connected.
•Trunk link
It is the section where only the frames with VLAN tag flow. Same devices which support VLAN function with tag,
are connected by normal trunk link. End node which cannot recognize VLAN tag is not connected.
•Hybrid link
It is the section where frames with and without VLAN tag flow. Here, multiple VLANs exist and there are access
links or trunk links for respecitve VLANs. However, if focus is on specific protocol, there is only 1 VLAN where
hybrid link can be operated as access link. For example, when 2 VLANs are operated as access links on 1 hybrid
link, and if focused on IP protocol, only 1 from this can be recognized.
Points to be noted
• When 2 or more VLANs are operated as access links for specific protocol, since VLAN tag is not attached to
frame which is sent by respective VLAN, to which VLAN the frame belongs cannot be identified.
• When it is used together with spanning tree function, bridge frame and routing frame are according to
restrictions on spanning tree.
• When protocol VLAN definition is set such that it exceeds the upper limit that can be set in device, VLAN ID
specified in protocol VLAN definition that exceeds the upper limit and protocol VLAN definition, becomes
invalid, and hence all the ports that belong to invalid VLAN ID cannot be used. In addition to this, upper limit
that can be set for protocol VLAN definition in the device is 16.
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