VLAN Management
Configuring Default VLAN Settings
187 Cisco Small Business 300 Series Managed Switch Administration Guide
12
Customer traffic is encapsulated with an S-tag with TPID 0x8100, regardless of
whether it was originally c-tagged or untagged. The S-tag allows this traffic to be
treated as an aggregate within a provider bridge network, where the bridging is
based on the S-tag VID (S-VID) only.
The S-Tag is preserved while traffic is forwarded through the network service
provider's infrastructure, and is later removed by an egress device.
An additional benefit of QinQ is that there is no need to configure customers' edge
devices.
QinQ is enabled in the VLAN Management > Interface Settings page.

VLAN Configuration Workflow

To configure VLANs:
1. If required, change the default VLAN by using the Configuring Default VLAN
Settings section.
2. Create the required VLANs by using the Creating VLANs section.
3. Set the desired VLAN-related configuration for ports and enable QinQ on an
interface using the Configuring VLAN Interface Settings section.
4. Assign inte rfaces to VLAN s by using the Configuring Port to VLAN section or
the Configuring VLAN Membership section.
5. View the current VLAN port membership for all the interfaces in the Configuring
VLAN Membership section.
Configuring Default VLAN Settings
When using factory default settings, the device automatically creates VLAN1 as
the default VLAN, the default interface status of all ports is Trunk, and all ports are
configured as untagged members of the default VLAN.
The default VLAN has the following characteristics:
•It is distinct, non-static/non-dynamic, and all ports are untagged members
by default.
•It cannot be deleted.
•It cannot be given a label.