Web Management Guide-R04

Table Of Contents
Chapter 4
| Interface Configuration
VLAN Trunking
– 164 –
3. Select Show from the Action list.
Figure 76: Showing Traffic Segmentation Members
VLAN Trunking
Use the Interface > VLAN Trunking page to allow unknown VLAN groups to pass
through the specified interface.
Command Usage
Use this feature to configure a tunnel across one or more intermediate switches
which pass traffic for VLAN groups to which they do not belong.
The following figure shows VLANs 1 and 2 configured on switches A and B, with
VLAN trunking being used to pass traffic for these VLAN groups across switches
C, D and E.
Figure 77: Configuring VLAN Trunking
Without VLAN trunking, you would have to configure VLANs 1 and 2 on all
intermediate switches – C, D and E; otherwise these switches would drop any
frames with unknown VLAN group tags. However, by enabling VLAN trunking
on the intermediate switch ports along the path connecting VLANs 1 and 2,
you only need to create these VLAN groups in switches A and B. Switches C, D
and E automatically allow frames with VLAN group tags 1 and 2 (groups that
are unknown to those switches) to pass through their VLAN trunking ports.
VLAN trunking is mutually exclusive with the “access” switchport mode (see
Adding Static Members to VLANs” on page 173). If VLAN trunking is enabled
on an interface, then that interface cannot be set to access mode, and vice
versa.