Cisco Systems Cisco Systems Nokia Juniper Networks RFC9252 defines procedures and messages for BGP Overlay Services for Segment Routing over IPv6 (SRv6) including Layer 3 Virtual Private Network, Ethernet Virtual Private Network, and Global Internet Routing. This document updates RFC9252 and provides more detailed specifications for the signaling and processing of SRv6 Segment Identifiers advertisements for BGP Overlay Service routes associated with SRv6 Endpoint Behaviors that support arguments.