Transition Networks SISPM1040-182D user manual 18.2 802.1Q Vlan

Transition Networks SISPM1040-182D

6.18.2 802.1Q VLAN

Virtual Local Area Network (VLAN) can be implemented on the switch to logically create different broadcast domains.

When the 802.1Q VLAN function is enabled, all ports on the switch belong to 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 number of VLAN groups is up to 256, including the default VLAN that cannot be deleted.

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. Additionally, 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 one 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, communication across switches can send the packet through tagged and untagged ports.

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