Virtual Private LAN Services
7210 SAS M Services Guide Page 285
VPLS Service Considerations
This section describes various 7210 SAS service features and any special capabilities or
considerations as they relate to VPLS services.
SAP Encapsulations
VPLS services are designed to carry Ethernet frame payloads, so it can provide connectivity
between any SAPs that pass Ethernet frames. The following SAP encapsulations are supported on
the VPLS service:
• Ethernet null
• Ethernet Dot1q
• Ethernet Dot1q Default
• Ethernet Dot1q Explicit Null
VLAN Processing
The SAP encapsulation definition on Ethernet ingress ports defines which VLAN tags are used to
determine the service that the packet belongs:
1. Null encapsulation defined on ingress — Any VLAN tags are ignored and the packet goes to
a default service for the SAP.
2. Dot1q encapsulation defined on ingress — Only first label is considered.
3. Dot1q Default encapsulation defined on ingress — Tagged packets not matching any of the
configured VLAN encapsulations would be accepted. This is like a default SAP for tagged
packets.
4. Dot1q Explicit Null encapsulation defined on ingress — Any untagged or priority tagged
packets will be accepted.
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