Planet GS-5220 Series User Manual page 196

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:
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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:
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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
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
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User's Manual of GS-5220 LCD Series