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L2SWITCH(config)#protocol-vlan frame-type nonLLC-SNAP vlan 13 ports 3-4
L2SWITCH(config)#protocol-vlan frame-type ethernetII ether-type 0800 vlan 14 ports 1-2
6.3.5.3.
Web Configuration
Parameter
Description
Frame Type
Select one of three frame types, “EthernetIU” and “NonLLC-SNAP”
and “LLC-SNAP”.
Ethernet type
Input the Ethernet type for the EthernetII frame type.
VLAN
Configure the VLAN ID.
Port List
Configure the member ports.
Action
Click the “Delete” button to delete the protocol VLAN profile.
6.3.6.
Q-in-Q VLAN (VLAN Stacking)
6.3.6.1.
Introduction
Q-in-Q tunneling is also known as VLAN stacking. Both of them use 802.1q double tagging
technology. Q-in-Q is required by ISPs (Internet Service Provider) that need Transparent LAN
services (TLS), and the service provider has their own set of VLAN, independent of customer
VLANs. Typically, each service provider VLAN interconnects a group of sites belonging to a
customer. However, a service provider VLAN could also be shared by a set of customers sharing
the same end points and quality of service requirements of the VLAN. Double tagging is
considered to be a relatively simpler way of implementing transparent LAN. This is
accomplished by encapsulating Ethernet Frame. A second or outer VLAN tag is inserted in
Ethernet frames sent over the ingress PE (Provider Edge). This VLAN tag corresponds to the
VLAN of the Service Provider (SP). When the frame reaches the destination PE, the SP VLAN
is stripped off. The DA of the encapsulated frame and the VLAN ID are used to take further L2
