The following lists encapsulation service options on Ethernet access ports:
null
Supports a single service on the port. For example, where a single customer with a single service customer edge (CE) device is attached to the port. The encapsulation ID is always 0 (zero).
dot1q
Supports multiple services for one customer or services for multiple customers (Figure: Multiple SAPs on a single port). For example, the port is connected to a customer who needs multiple services. The encapsulation ID used to distinguish an individual service is the VLAN ID in the IEEE 802.1Q header.
QinQ
The QinQ encapsulation type adds a IEEE 802.1Q tag to the 802.1Q tagged packets entering the network, to expand the VLAN space by tagging tagged packets, producing a double-tagged frame.
The following lists encapsulation service options on Ethernet access-uplink ports:
QinQ
The QinQ encapsulation type adds a IEEE 802.1Q tag to the 802.1Q tagged packets entering the network, to expand the VLAN space by tagging tagged packets, producing a double-tagged frame.
Figure: Multiple SAPs on a single port