The IESG has approved the following document: - 'Propagation of ARP/ND Flags in EVPN' (draft-ietf-bess-evpn-na-flags-09.txt) as Proposed Standard
This document is the product of the BGP Enabled ServiceS Working Group. The IESG contact persons are Alvaro Retana, John Scudder and Martin Vigoureux. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-na-flags/ Technical Summary An EVPN MAC/IP Advertisement route can optionally carry an IPv4 or IPv6 addresses associated with a MAC address. Remote PEs can use this information to populate their ARP/ND tables on IRB interfaces or their proxy-ARP/ND tables in Broadcast Domains (BD). PEs can then reply locally (act as an ARP/ND proxy) to IPv4 ARP requests and IPv6 Neighbor Solicitation messages and reduce/suppress the flooding produced by the Address Resolution procedure. However, the information conveyed in the MAC/IP route may not be enough for the remote PE to reply to local ARP or ND requests. For example, if a PE learns an IPv6->MAC ND entry via EVPN, the PE would not know if that 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 EVPN MAC/IP Advertisement routes. Similarly, other information relevant to the IP->MAC ARP/ND entries may be needed. This document defines an Extended Community that is advertised along with an EVPN MAC/IP Advertisement route and carries information relevant to the ARP/ND resolution, so that an EVPN PE implementing a proxy-ARP/ND function can reply to ARP Requests or Neighbor Solicitations with the correct information. Working Group Summary The document was developed to address the desire to minimise flooding of traffic associated with address resolution in EVPN. It is particularly important due to the large size that EVPN networks can grow to, particularly in terms of the numbers of CEs and hosts. It makes use of some flags in a new BGP extended community to do this. There are no IPR declarations on the draft . Document Quality This document quite well written. It represents WG consensus, and it has been widely reviewed and discussed on the list over a number of years. Personnel The document shepherd is Matthew Bocci The responsible Area Director is Martin Vigoureux _______________________________________________ BESS mailing list BESS@ietf.org https://www.ietf.org/mailman/listinfo/bess