C
HAPTER
5
| Interface Configuration
VLAN Trunking
– 191 –
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 198). If VLAN trunking
is enabled on an interface, then that interface cannot be set to access
mode, and vice versa.
◆ To prevent loops from forming in the spanning tree, all unknown VLANs
will be bound to a single instance (either STP/RSTP or an MSTP
instance, depending on the selected STA mode).
◆ If both VLAN trunking and ingress filtering are disabled on an interface,
packets with unknown VLAN tags will still be allowed to enter this
interface and will be flooded to all other ports where VLAN trunking is
enabled. (In other words, VLAN trunking will still be effectively enabled
for the unknown VLAN).
PARAMETERS
These parameters are displayed:
◆ Interface – Displays a list of ports or trunks.
◆ Port – Port Identifier. (Range: 1-28)
◆ Trunk – Trunk Identifier. (Range: 1-12)
◆ VLAN Trunking Status – Enables VLAN trunking on the selected
interface.
WEB INTERFACE
To enable VLAN trunking on a port or trunk:
1. Click Interface, VLAN Trunking.
2. Click Port or Trunk to specify the interface type.
3. Enable VLAN trunking on any of the ports or on a trunk.
4. Click Apply.
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