ZyXEL ES-3148 Guida Utente

 Chapter 8 VLAN

ES-3148 User’s Guide

Enable VLAN Trunking on a port to allow frames belonging to unknown VLAN groups to 
pass through that port. This is useful if you want to set up VLAN groups on end devices 
without having to configure the same VLAN groups on intermediary devices.
Refer to the following figure. Suppose you want to create VLAN groups 1 and 2 (V1 and V2) 
on devices A and B. Without VLAN Trunking, you must configure VLAN groups 1 and 2 on 
all intermediary switches C, D and E; otherwise they will drop frames with unknown VLAN 
group tags. However, with VLAN Trunking enabled on a port(s) in each intermediary switch 
you only need to create VLAN groups in the end devices (A and B). C, D and E automatically 
allow frames with VLAN group tags 1 and 2 (VLAN groups that are unknown to those 
switches) to pass through their VLAN trunking port(s).

Figure 30   Port VLAN Trunking 

Select a VLAN type in the Basic Setting > Switch Setup screen. 

Figure 31   Switch Setup: Select VLAN Type 

Use a static VLAN to decide whether an incoming frame on a port should be

• sent to a VLAN group as normal depending on its VLAN tag. 
• sent to a group whether it has a VLAN tag or not. 
• blocked from a VLAN group regardless of its VLAN tag. 

You can also tag all outgoing frames (that were previously untagged) from a port with the 
specified VID.