Port Level
All existing Ethernet encapsulation types are supported (for example, null, dot1q, qinq).
SAPs
The I-VPLS SAPs can coexist on the same port with SAPs for other business services, for example, VLL, VPLS SAPs.
All existing Ethernet encapsulation are supported: null, dot1q, qinq.
SDPs
GRE and MPLS SDP are spoke-sdp only. Mesh SDPs can just be emulated by using the same split horizon group everywhere.
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:
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.
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.
I-VPLS services do not support the forwarding of PBB encapsulated frames received on SAPs or Spoke-SDPs through their associated B-VPLS service. PBB frames are identified based on the configured PBB Ethertype (0x88e7 by default).