Propagation of IPv6 Neighbor Advertisement Flags in EVPN

The information below is for an old version of the document
Document Type Expired Internet-Draft (individual)
Last updated 2016-01-07 (latest revision 2015-07-06)
Replaced by draft-ietf-bess-evpn-na-flags
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The MAC/IP Advertisement route specified in [RFC7432] can optionally carry IPv4 and IPv6 addresses associated with a MAC address. Remote PEs can use this information to reply locally (act as proxy) to IPv4 ARP requests and IPv6 Neighbor Solicitation messages and reduce/suppress the flooding produced by the Address Resolution procedure. However, if the Neighbor information is learnt via EVPN, the PE would not know if a particular IPv6->MAC pair belongs to a host, a router or a host with an anycast address as this information is not carried in the MAC/IP route advertisements. This document proposes an OPTIONAL advertisement of the Flags defined in [RFC4861] along with the EVPN MAC/IP Advertisement routes, so that an EVPN PE implementing a proxy-ND function can reply to Neighbor Solicitations with the correct Flag information in Neighbor Advertisements.


Jorge Rabadan (
Senthil Sathappan (
Kiran Nagaraj (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)