Alcatel-Lucent 7750 SR Manual page 775

Existing SAP processing rules still apply for the I-VPLS case; the SAP encapsulation definition on
Ethernet ingress ports defines which VLAN tags are used to determine the service that the packet
belongs to:
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7750 SR OS Services Guide
Null encap defined on ingress — Any VLAN tags are ignored and the packet goes to a
default service for the SAP;
Dot1q encap defined on ingress — only first VLAN tag is considered;
Qinq encap defined on ingress — both VLAN tags are considered; wildcard support for
the inner VLAN tag
For dot1q/qinq encapsulations, traffic encapsulated with VLAN tags for which there is no
definition is discarded.
Note that any VLAN tag used for service selection on the I-SAP is stripped before the
PBB encapsulation is added. Appropriate VLAN tags are added at the remote PBB PE
when sending the packet out on the egress SAP.
Virtual Private LAN Services
Page 775