[{"name":"S2-1901473","title":"Clarification on ARP Proxy","source":"Huawei, HiSilicon","contact":"Runze Zhou","contact-id":60945,"tdoctype":"CR","for":"Approval","abstract":"Summary of change: It is proposed to remove the references to RFCs 1027 and 4861 to avoid misinterprations. RFC 4861 is not removed from clause 2 since it is referred for other purposes like stateless autoconfiguration elsewhere in the specification. It is proposed to describe ARP\/ND proxying as responding to ARP\/ND from a local cache. Provide reference to IETF RFC 8302 as an informative NOTE to explain how a problem of similar nature is addressed in Data Center Networks. It is also clarified in the NOTE Similar mechanisms can be used by UPF \/ SMF for responding to ARP\/ND based on local cache information to avoid broadcasting or multicasting the ARP\/IPv6 ND to every UE \/ clients behind UE \/ clients in the Ethernet DN. The clients in the Etherne DN is also mentioned because if the cache is built by learning the MAC to IP mapping in the UPF \/ SMF and the UPF acts as a L2 switch on N6 side, the UPF \/ SMF can avoid broadcasting the DL ARP request to other clients in DN and\/or the UEs. 3GPP should allow the possibility to avoid ARP broadcast in N6 if implementations of UPF can take care of it.","secretary_remarks":"Revised in parallel session to S2-1902192.","agenda_item_sort_order":20,"ainumber":"6.5.3","ainame":"Session management and continuity functions and flows","tdoc_agenda_sort_order":11350,"status":"revised","reservation_date":"2019-02-14 07:36:32","uploaded":"2019-02-19 14:35:58","revisionof":"","revisedto":"S2-1902192","release":"Rel-15","crspec":23.501,"crspecversion":"15.4.0","workitem":[{"winame":"5GS_Ph1"}],"crnumber":910.0,"crrevision":"","crcategory":"F","tsg_crp":"","lsreplyto":"","lsto":"","Cc":"","lsoriginalls":"","lsreply":"","link":"http:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_131_Tenerife\/Docs\/S2-1901473.zip","group":"S2","meeting":"S2-131","year":2019,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0}]