Vpls Service Considerations; Sap Encapsulations; Vlan Processing - Alcatel-Lucent 7750 SR OS Service Manual

VPLS Service Considerations

This section describes various of the general 7750 SR service features and any special capabilities
or considerations as they relate to VPLS services.

SAP Encapsulations

The 7750 SR VPLS service is designed to carry Ethernet frame payloads, so it can provide
connectivity between any SAPs and SDPs that pass Ethernet frames. The following SAP
encapsulations are supported on the 7750 SR VPLS service:
•
•
•
•
•
•
•

VLAN processing

The SAP encapsulation definition on Ethernet ingress ports defines which VLAN tags are used to
determine the service that the packet belongs to:
1. null encap defined on ingress: Any VLAN tags are ignored and the packet goes to a default
service for the SAP;
2. dot1q encap defined on ingress: Only first label is considered;
3. qinq encap defined on ingress: both labels are considered.
Note that the SAP can be defined with a wildcard for the inner label. (e.g. "100:*"). In this
situation all packets with an outer label of 100 will treated as belonging to the SAP. If, on the
same physical link there is also a SAP defined with qinq encap of 100:1 then traffic with
100:1 will go to that SAP and all other traffic with 100 as the first label will go to the SAP
with the 100:* definition.
In situations 2 and 3 above, traffic encapsulated with tags for which there is no definition are
discarded.
7750 SR OS Services Guide
Ethernet null
Ethernet dot1q
Ethernet qinq
SONET/SDH BCP-null
SONET/SDH BCP-dot1q
ATM VC with RFC 2684 Ethernet bridged encapsulation (See
Access and Termination on a VPLS Service on page
FR VC with RFC 2427 Ethernet bridged encapsulation (See
Access and Termination on a VPLS Service on page
Virtual Private LAN Services
ATM/Frame Relay PVC
426.)
ATM/Frame Relay PVC
426.)
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