ES-4024A Series Switch Support Notes
untagged frame is received, Ingress Process insert a tag contained the PVID into the untagged frame. Each physical port has a default VID called PVID (Port VID). PVID is assigned to untagged frames or priority tagged frames (frames with null (0) VID) received on this port.
After Ingress Process, all frames have
2. Forwarding Process:
The Forwarding Process decides to forward the received frames according to the Filtering Database. If you want to allow the tagged frames can be forwarded to certain port, this port must be the egress port of this VID. The egress port is an outgoing port for the specified VLAN, that is, frames with specified VID tag can go through this port. The Filtering Database stores and organizes VLAN registration information useful for switching frames to and from switch ports. It consists of static registration entries (Static VLAN or SVLAN table) and dynamic registration entries (Dynamic VLAN or DVLAN table). SVLAN table is manually added and maintained by the administrator. DVLAN table is automatically learned via GVRP protocol, and can't be created and upgraded by the administrator.
The VLAN entries in Filtering Database have the following information:
1.VID: VLAN ID
2.Port: The switch port number
3.Ad Control: Registration administration control. There are 3 type of ad control, including forbidden registration, fixed registration and normal registration.
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