System information

54 IBM and Cisco LAN Switching: Interoperability and Migration Guide
An access port is intended to connect to a network with untagged devices
only. When a frame arrives at an access port, it becomes a member of the
VLAN that is set by the default VLAN ID (or PVID). As the frame enters the
switch, it is tagged with a VLAN tag with a value equal to the PVID of the port.
This frame is then sent to other ports in the switch that belong to this VLAN.
Hybrid ports are used for trunks. A hybrid port can receive and send both
tagged and untagged frames when at least two VLANs are configured on the
port. If an untagged frame is received at a hybrid port, it follows the same
rules as an untagged frame received at an access port. The untagged frame
will have a tag inserted with a value equal to the PVID of the port and the
frame will be switched to the set of ports that belong to this VLAN. For any
VLAN all frames must be either tagged or untagged, not mixed.
Figure 33. Switch Port Control / Status: Port 2