For the access interface, most types of SAPs on Layer 2 and Layer 3 services are supported including capture SAPs, SAPs on pseudowires, B-VPLS SAPs, and VPLS template SAPs, but are not applicable to Epipe template SAPs and video ISA SAPs.
Control packets that are extracted in a VPRN service, where the packets arrived into the node through a VPLS SAP (that is, R-VPLS scenario), use the DCP policy and policer instances associated with the VPLS SAP. For VPLSs that have a Layer 3 interface bound to them, (R-VPLS), protocols such as OSPF and ARP may be configured in the DCP policy.
Control traffic that arrives on a network interface, but inside a tunnel (for example, SDP, LSP, PW) and logically terminates on a service (that is, traffic that is logically extracted by the service instead of the network interface layer itself) bypass the DCP function. The control packets are not subject to the DCP policy that is assigned to the network interface on which the packets arrived. This helps to avoid customer traffic in a service from impacting other services or the operator's infrastructure.