The grayed out fields show the value that the port will get when the mode is applied to the port. A port can have one of three modes: 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 a 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 – except 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, but they have 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 S-custom-tag aware
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Ingress filtering can be controlled
• Ingress acceptance of frames and configuration of egress tagging can be configured independently Port VLAN Set or show the port’s VLAN ID (a.k.a. PVID). Allowed VLANs are in the range 1 through 4095 (the default is 1. On ingress, frames get classified to the Port VLAN if:
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