Neighbor Cache Entries on First-Hop Routers: Operational Considerations

Document Type Expired Internet-Draft (v6ops WG)
Author Jen Linkova 
Last updated 2021-03-10 (latest revision 2020-09-06)
Replaces draft-linkova-v6ops-nd-cache-init
Stream Internet Engineering Task Force (IETF)
Intended RFC status Informational
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Jordi Palet Martinez
Shepherd write-up Show (last changed 2020-07-14)
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus Boilerplate Yes
Telechat date
Responsible AD Warren Kumari
Send notices to Jordi Palet Martinez <>
IANA IANA review state Version Changed - Review Needed

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Neighbor Discovery (RFC4861) is used by IPv6 nodes to determine the link-layer addresses of neighboring nodes as well as to discover and maintain reachability information. This document discusses how the neighbor discovery state machine on a first-hop router is causing user-visible connectivity issues when a new (not being seen on the network before) IPv6 address is being used. The various approaches to mitigate the problem are described, with the proposed solution fully documented in I-D.ietf-6man-grand.


Jen Linkova (

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