Chapter
3: Web Management
VLANs
PoE Switch User Manual | 161
out or made changeable depending on the mode in question.
Grayed out fields show the value that the port will get when the mode is applied.
Access
Access ports are normally used to connect to end stations. Dynamic features like Voice VLAN
may add the port to more VLANs behind the scenes. Access ports have the following
characteristics:
Member of exactly one VLAN, the Port VLAN (a.k.a. Access VLAN), which by default is
1
Accepts untagged and C-tagged frames
Discards all frames that are not classified to the Access VLAN
On egress all frames classified to the Access VLAN are transmitted untagged. Other
(dynamically added VLANs) are transmitted tagged
Trunk
Trunk ports can carry traffic on multiple VLANs simultaneously, and are normally used to
connect to other switches. Trunk ports have the following characteristics:
By default, a trunk port is member of all VLANs (1-4095)
The VLANs that a trunk port is member of may be limited by the use of Allowed VLANs
Frames classified to a VLAN that the port is not a member of are discarded
By default, all frames but frames classified to the Port VLAN (a.k.a. Native VLAN) get
tagged on egress. Frames classified to the Port VLAN do not get C-tagged on egress
Egress tagging can be changed to tag all frames, in which case only tagged frames are
accepted on ingress
Hybrid
Hybrid ports resemble trunk ports in many ways, but adds additional port configuration
features. In addition to the characteristics described for trunk ports, hybrid ports have these
abilities:
Can be configured to be VLAN tag unaware, C-tag aware, S-tag aware, or
S-custom-tag aware
Ingress filtering can be controlled
Ingress acceptance of frames and configuration of egress tagging can be configured
independently