4A0-115: Nokia Ethernet Virtual Private Network Services

RFC 8214 specifies that EVPN-VPWS uses only Ethernet Auto-Discovery (A-D) per-EVI routes (Type 1) — it does not use MAC/IP Advertisement routes, since no MAC learning or lookup is required for a point-to-point VPWS service. When a PE advertises its per-EVI A-D route, the Ethernet Tag ID field must always be set to a non-zero value, representing the locally significant VPWS service instance identifier for that PE's attachment circuit, and the route also carries a non-zero MPLS label that the remote PE uses in the data plane to forward traffic to the correct egress AC. The two PEs' local AC tag/VLAN values do not need to match each other; EVPN-VPWS does not require tag translation or verification between PEs — the MPLS label, not the tag value, identifies the destination AC.