Juniper Networks Orange Broadcom Verizon Bell Canada Draft-bonica-spring-srv6-end-dtm specifies SRv6/MPLS transport interworking procedures, and draft-agrawal-spring-srv6-mpls- interworking specifies SRv6/MPLS transport and service interworking procedures. For service interworking, the latter draft defines two modes, similar to VPN Inter-AS Option A and Option B. This document specifies another Option BC for service interworking which has much better scaling property.