ZTE Corporation ZTE Corporation Cisco Systems Arrcus, Inc Both SR-MPLS prefixes-SID and IPv4 prefix may be configured as anycast and as such the same value can be advertised by multiple routers. It is useful for other routers to know that the advertisement is for an anycast identifier. Each prefix is advertised along with an 8-bit field of capabilities,by using the flag flield in the OSPFv2 Extended Prefix TLV [RFC7684], but the definition of anycast flag to identify the prefix as anycast has not yet been defined. This document updates [RFC7684], by defining a new flag in the OSPFv2 Extended Prefix TLV [RFC7684] to advertise the anycast property.