Cisco Systems SRW248G4PK9NA User Manual

Configuring Default VLAN Settings

187

Cisco Small Business 300 Series Managed Switch Administration Guide 

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.

To configure VLANs:

1. If required, change the default VLAN by using the 

 section.

2. Create the required VLANs by using the 

 section.

3. Set the desired VLAN-related configuration for ports and enable QinQ on an 

interface using the 

 section.

4. Assign interfaces to VLANs by using the 

 section or 

the 

 section.

5. View the current VLAN port membership for all the interfaces in the 

 section.

When using factory default settings, the device automatically creates VLAN 1 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.