Specifications

VLANs
Rev. 9.41 Module 2 – 39
Tagged and untagged VLAN memberships
The 802.1Q field allows switches to support multiple VLANs. To allow a switch port
to transmit and receive traffic in a particular VLAN, you configure that port to be a
tagged or untagged member of that VLAN.
For untagged memberships, the Ethernet frame cannot contain the 802.1Q field.
Devices that do not support 802.1Q can only be an untagged member of a VLAN.
For tagged memberships, the Ethernet frame must contain the 802.1Q field.
Typically, tagged memberships are used if a port, such as an uplink port, carries
traffic from multiple VLANs.
In the example shown here, the uplink port is a tagged member of VLAN 10 and an
untagged member of VLAN 1. It can transmit and receive traffic from both VLANs.
When VLAN tagging is enabled, administrators can assign each switch port to one
untagged VLAN and to multiple tagged VLANs.
For HP Internal Use Only